merge setup

include/git2/merge.h

@@ -23,13 +23,13 @@
 GIT_BEGIN_DECL
 
 /**
- * Flags for tree_many diff options.  A combination of these flags can be
- * passed in via the `flags` value in the `git_diff_tree_many_options`.
+ * Flags for `git_mrege_tree` options.  A combination of these flags can be
+ * passed in via the `flags` vlaue in the `git_merge_tree_opts`.
  */
 typedef enum {
 	/** Detect renames */
 	GIT_MERGE_TREE_FIND_RENAMES = (1 << 0),
-} git_merge_tree_flags;
+} git_merge_tree_flag_t;
 
 /**
  * Automerge options for `git_merge_trees_opts`.
@@ -44,7 +44,7 @@ typedef enum {
 
 typedef struct {
 	unsigned int version;
-	git_merge_tree_flags flags;
+	git_merge_tree_flag_t flags;
 
 	/** Similarity to consider a file renamed (default 50) */
 	unsigned int rename_threshold;
@@ -96,6 +96,57 @@ GIT_EXTERN(int) git_merge_base_many(
 	size_t length);
 
 /**
+ * Creates a `git_merge_head` from the given reference
+ *
+ * @param out pointer to store the git_merge_head result in
+ * @param repo repository that contains the given reference
+ * @param ref reference to use as a merge input
+ * @return zero on success, -1 on failure.
+ */
+GIT_EXTERN(int) git_merge_head_from_ref(
+	git_merge_head **out,
+	git_repository *repo,
+	git_reference *ref);
+
+/**
+ * Creates a `git_merge_head` from the given fetch head data
+ *
+ * @param out pointer to store the git_merge_head result in
+ * @param repo repository that contains the given commit
+ * @param branch_name name of the (remote) branch
+ * @param remote_url url of the remote
+ * @param oid the commit object id to use as a merge input
+ * @return zero on success, -1 on failure.
+ */
+GIT_EXTERN(int) git_merge_head_from_fetchhead(
+	git_merge_head **out,
+	git_repository *repo,
+	const char *branch_name,
+	const char *remote_url,
+	const git_oid *oid);
+
+/**
+ * Creates a `git_merge_head` from the given commit id
+ *
+ * @param out pointer to store the git_merge_head result in
+ * @param repo repository that contains the given commit
+ * @param oid the commit object id to use as a merge input
+ * @return zero on success, -1 on failure.
+ */
+GIT_EXTERN(int) git_merge_head_from_oid(
+	git_merge_head **out,
+	git_repository *repo,
+	const git_oid *oid);
+
+/**
+ * Frees a `git_merge_head`
+ *
+ * @param the merge head to free
+ */
+GIT_EXTERN(void) git_merge_head_free(
+	git_merge_head *head);
+
+/**
  * Merge two trees, producing a `git_index` that reflects the result of
  * the merge.
  *

include/git2/types.h

@@ -168,6 +168,9 @@ typedef struct git_reference git_reference;
 /** Iterator for references */
 typedef struct git_reference_iterator  git_reference_iterator;
 
+/** Merge heads, the input to merge */
+typedef struct git_merge_head git_merge_head;
+
 
 /** Basic type of any Git reference. */
 typedef enum {

src/merge.c

@@ -54,39 +54,6 @@ struct merge_diff_df_data {
 };
 
 
-int git_repository_merge_cleanup(git_repository *repo)
-{
-	int error = 0;
-	git_buf merge_head_path = GIT_BUF_INIT,
-		merge_mode_path = GIT_BUF_INIT,
-		merge_msg_path = GIT_BUF_INIT;
-
-	assert(repo);
-
-	if (git_buf_joinpath(&merge_head_path, repo->path_repository, GIT_MERGE_HEAD_FILE) < 0 ||
-		git_buf_joinpath(&merge_mode_path, repo->path_repository, GIT_MERGE_MODE_FILE) < 0 ||
-		git_buf_joinpath(&merge_msg_path, repo->path_repository, GIT_MERGE_MSG_FILE) < 0)
-		return -1;
-
-	if (git_path_isfile(merge_head_path.ptr)) {
-		if ((error = p_unlink(merge_head_path.ptr)) < 0)
-			goto cleanup;
-	}
-
-	if (git_path_isfile(merge_mode_path.ptr))
-		(void)p_unlink(merge_mode_path.ptr);
-
-	if (git_path_isfile(merge_msg_path.ptr))
-		(void)p_unlink(merge_msg_path.ptr);
-
-cleanup:
-	git_buf_free(&merge_msg_path);
-	git_buf_free(&merge_mode_path);
-	git_buf_free(&merge_head_path);
-
-	return error;
-}
-
 /* Merge base computation */
 
 int git_merge_base_many(git_oid *out, git_repository *repo, const git_oid input_array[], size_t length)
@@ -1380,6 +1347,18 @@ git_merge_diff_list *git_merge_diff_list__alloc(git_repository *repo)
 	return diff_list;
 }
 
+void git_merge_diff_list__free(git_merge_diff_list *diff_list)
+{
+	if (!diff_list)
+		return;
+
+	git_vector_free(&diff_list->staged);
+	git_vector_free(&diff_list->conflicts);
+	git_vector_free(&diff_list->resolved);
+	git_pool_clear(&diff_list->pool);
+	git__free(diff_list);
+}
+
 static int merge_tree_normalize_opts(
 	git_repository *repo,
 	git_merge_tree_opts *opts,
@@ -1617,14 +1596,550 @@ done:
 	return error;
 }
 
-void git_merge_diff_list__free(git_merge_diff_list *diff_list)
+/* Merge setup / cleanup */
+
+static int write_orig_head(
+	git_repository *repo,
+	const git_merge_head *our_head)
 {
-	if (!diff_list)
+	git_filebuf file = GIT_FILEBUF_INIT;
+	git_buf file_path = GIT_BUF_INIT;
+	char orig_oid_str[GIT_OID_HEXSZ + 1];
+	int error = 0;
+
+	assert(repo && our_head);
+
+	git_oid_tostr(orig_oid_str, GIT_OID_HEXSZ+1, &our_head->oid);
+
+	if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_ORIG_HEAD_FILE)) == 0 &&
+		(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE)) == 0 &&
+		(error = git_filebuf_printf(&file, "%s\n", orig_oid_str)) == 0)
+		error = git_filebuf_commit(&file, 0666);
+
+	if (error < 0)
+		git_filebuf_cleanup(&file);
+
+	git_buf_free(&file_path);
+
+	return error;
+}
+
+static int write_merge_head(
+	git_repository *repo,
+	const git_merge_head *heads[],
+	size_t heads_len)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	git_buf file_path = GIT_BUF_INIT;
+	char merge_oid_str[GIT_OID_HEXSZ + 1];
+	size_t i;
+	int error = 0;
+
+	assert(repo && heads);
+
+	if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_MERGE_HEAD_FILE)) < 0 ||
+		(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE)) < 0)
+		goto cleanup;
+
+	for (i = 0; i < heads_len; i++) {
+		git_oid_tostr(merge_oid_str, GIT_OID_HEXSZ+1, &heads[i]->oid);
+
+		if ((error = git_filebuf_printf(&file, "%s\n", merge_oid_str)) < 0)
+			goto cleanup;
+	}
+
+	error = git_filebuf_commit(&file, 0666);
+
+cleanup:
+	if (error < 0)
+		git_filebuf_cleanup(&file);
+
+	git_buf_free(&file_path);
+
+	return error;
+}
+
+static int write_merge_mode(git_repository *repo, unsigned int flags)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	git_buf file_path = GIT_BUF_INIT;
+	int error = 0;
+
+	/* For future expansion */
+	GIT_UNUSED(flags);
+
+	assert(repo);
+
+	if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_MERGE_MODE_FILE)) < 0 ||
+		(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE)) < 0)
+		goto cleanup;
+
+	error = git_filebuf_commit(&file, 0666);
+
+cleanup:
+	if (error < 0)
+		git_filebuf_cleanup(&file);
+
+	git_buf_free(&file_path);
+
+	return error;
+}
+
+struct merge_msg_entry {
+	const git_merge_head *merge_head;
+	bool written;
+};
+
+static int msg_entry_is_branch(
+	const struct merge_msg_entry *entry,
+	git_vector *entries)
+{
+	GIT_UNUSED(entries);
+
+	return (entry->written == 0 &&
+		entry->merge_head->remote_url == NULL &&
+		entry->merge_head->ref_name != NULL &&
+		git__strncmp(GIT_REFS_HEADS_DIR, entry->merge_head->ref_name, strlen(GIT_REFS_HEADS_DIR)) == 0);
+}
+
+static int msg_entry_is_tracking(
+	const struct merge_msg_entry *entry,
+	git_vector *entries)
+{
+	GIT_UNUSED(entries);
+
+	return (entry->written == 0 &&
+		entry->merge_head->remote_url == NULL &&
+		entry->merge_head->ref_name != NULL &&
+		git__strncmp(GIT_REFS_REMOTES_DIR, entry->merge_head->ref_name, strlen(GIT_REFS_REMOTES_DIR)) == 0);
+}
+
+static int msg_entry_is_tag(
+	const struct merge_msg_entry *entry,
+	git_vector *entries)
+{
+	GIT_UNUSED(entries);
+
+	return (entry->written == 0 &&
+		entry->merge_head->remote_url == NULL &&
+		entry->merge_head->ref_name != NULL &&
+		git__strncmp(GIT_REFS_TAGS_DIR, entry->merge_head->ref_name, strlen(GIT_REFS_TAGS_DIR)) == 0);
+}
+
+static int msg_entry_is_remote(
+	const struct merge_msg_entry *entry,
+	git_vector *entries)
+{
+	if (entry->written == 0 &&
+		entry->merge_head->remote_url != NULL &&
+		entry->merge_head->ref_name != NULL &&
+		git__strncmp(GIT_REFS_HEADS_DIR, entry->merge_head->ref_name, strlen(GIT_REFS_HEADS_DIR)) == 0)
+	{
+		struct merge_msg_entry *existing;
+
+		/* Match only branches from the same remote */
+		if (entries->length == 0)
+			return 1;
+
+		existing = git_vector_get(entries, 0);
+
+		return (git__strcmp(existing->merge_head->remote_url,
+			entry->merge_head->remote_url) == 0);
+	}
+
+	return 0;
+}
+
+static int msg_entry_is_oid(
+	const struct merge_msg_entry *merge_msg_entry)
+{
+	return (merge_msg_entry->written == 0 &&
+		merge_msg_entry->merge_head->ref_name == NULL &&
+		merge_msg_entry->merge_head->remote_url == NULL);
+}
+
+static int merge_msg_entry_written(
+	const struct merge_msg_entry *merge_msg_entry)
+{
+	return (merge_msg_entry->written == 1);
+}
+
+static int merge_msg_entries(
+	git_vector *v,
+	const struct merge_msg_entry *entries,
+	size_t len,
+	int (*match)(const struct merge_msg_entry *entry, git_vector *entries))
+{
+	size_t i;
+	int matches, total = 0;
+
+	git_vector_clear(v);
+
+	for (i = 0; i < len; i++) {
+		if ((matches = match(&entries[i], v)) < 0)
+			return matches;
+		else if (!matches)
+			continue;
+
+		git_vector_insert(v, (struct merge_msg_entry *)&entries[i]);
+		total++;
+	}
+
+	return total;
+}
+
+static int merge_msg_write_entries(
+	git_filebuf *file,
+	git_vector *entries,
+	const char *item_name,
+	const char *item_plural_name,
+	size_t ref_name_skip,
+	const char *source,
+	char sep)
+{
+	struct merge_msg_entry *entry;
+	size_t i;
+	int error = 0;
+
+	if (entries->length == 0)
+		return 0;
+
+	if (sep && (error = git_filebuf_printf(file, "%c ", sep)) < 0)
+		goto done;
+
+	if ((error = git_filebuf_printf(file, "%s ",
+		(entries->length == 1) ? item_name : item_plural_name)) < 0)
+		goto done;
+
+	git_vector_foreach(entries, i, entry) {
+		if (i > 0 &&
+			(error = git_filebuf_printf(file, "%s", (i == entries->length - 1) ? " and " : ", ")) < 0)
+			goto done;
+
+		if ((error = git_filebuf_printf(file, "'%s'", entry->merge_head->ref_name + ref_name_skip)) < 0)
+			goto done;
+
+		entry->written = 1;
+	}
+
+	if (source)
+		error = git_filebuf_printf(file, " of %s", source);
+
+done:
+	return error;
+}
+
+static int merge_msg_write_branches(
+	git_filebuf *file,
+	git_vector *entries,
+	char sep)
+{
+	return merge_msg_write_entries(file, entries,
+		"branch", "branches", strlen(GIT_REFS_HEADS_DIR), NULL, sep);
+}
+
+static int merge_msg_write_tracking(
+	git_filebuf *file,
+	git_vector *entries,
+	char sep)
+{
+	return merge_msg_write_entries(file, entries,
+		"remote-tracking branch", "remote-tracking branches", 0, NULL, sep);
+}
+
+static int merge_msg_write_tags(
+	git_filebuf *file,
+	git_vector *entries,
+	char sep)
+{
+	return merge_msg_write_entries(file, entries,
+		"tag", "tags", strlen(GIT_REFS_TAGS_DIR), NULL, sep);
+}
+
+static int merge_msg_write_remotes(
+	git_filebuf *file,
+	git_vector *entries,
+	char sep)
+{
+	const char *source;
+
+	if (entries->length == 0)
+		return 0;
+
+	source = ((struct merge_msg_entry *)entries->contents[0])->merge_head->remote_url;
+
+	return merge_msg_write_entries(file, entries,
+		"branch", "branches", strlen(GIT_REFS_HEADS_DIR), source, sep);
+}
+
+static int write_merge_msg(
+	git_repository *repo,
+	const git_merge_head *heads[],
+	size_t heads_len)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	git_buf file_path = GIT_BUF_INIT;
+	char oid_str[GIT_OID_HEXSZ + 1];
+	struct merge_msg_entry *entries;
+	git_vector matching = GIT_VECTOR_INIT;
+	size_t i;
+	char sep = 0;
+	int error = 0;
+
+	assert(repo && heads);
+
+	entries = git__calloc(heads_len, sizeof(struct merge_msg_entry));
+	GITERR_CHECK_ALLOC(entries); 
+
+	if (git_vector_init(&matching, heads_len, NULL) < 0)
+		return -1;
+
+	for (i = 0; i < heads_len; i++)
+		entries[i].merge_head = heads[i];
+
+	if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_MERGE_MSG_FILE)) < 0 ||
+		(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE)) < 0 ||
+		(error = git_filebuf_write(&file, "Merge ", 6)) < 0)
+		goto cleanup;
+
+	/*
+	 * This is to emulate the format of MERGE_MSG by core git.
+	 *
+	 * Core git will write all the commits specified by OID, in the order
+	 * provided, until the first named branch or tag is reached, at which
+	 * point all branches will be written in the order provided, then all
+	 * tags, then all remote tracking branches and finally all commits that
+	 * were specified by OID that were not already written.
+	 *
+	 * Yes.  Really.
+	 */
+	for (i = 0; i < heads_len; i++) {
+		if (!msg_entry_is_oid(&entries[i]))
+			break;
+
+		git_oid_fmt(oid_str, &entries[i].merge_head->oid);
+		oid_str[GIT_OID_HEXSZ] = '\0';
+
+		if ((error = git_filebuf_printf(&file, "%scommit '%s'", (i > 0) ? "; " : "", oid_str)) < 0)
+			goto cleanup;
+
+		entries[i].written = 1;
+	}
+
+	if (i)
+		sep = ';';
+
+	if ((error = merge_msg_entries(&matching, entries, heads_len, msg_entry_is_branch)) < 0 ||
+		(error = merge_msg_write_branches(&file, &matching, sep)) < 0)
+		goto cleanup;
+
+	if (matching.length)
+		sep =',';
+
+	if ((error = merge_msg_entries(&matching, entries, heads_len, msg_entry_is_tracking)) < 0 ||
+		(error = merge_msg_write_tracking(&file, &matching, sep)) < 0)
+		goto cleanup;
+
+	if (matching.length)
+		sep =',';
+	
+	if ((error = merge_msg_entries(&matching, entries, heads_len, msg_entry_is_tag)) < 0 ||
+		(error = merge_msg_write_tags(&file, &matching, sep)) < 0)
+		goto cleanup;
+
+	if (matching.length)
+		sep =',';
+
+	/* We should never be called with multiple remote branches, but handle
+	 * it in case we are... */
+	while ((error = merge_msg_entries(&matching, entries, heads_len, msg_entry_is_remote)) > 0) {
+		if ((error = merge_msg_write_remotes(&file, &matching, sep)) < 0)
+			goto cleanup;
+
+		if (matching.length)
+			sep =',';
+	}
+
+	if (error < 0)
+		goto cleanup;
+
+	for (i = 0; i < heads_len; i++) {
+		if (merge_msg_entry_written(&entries[i]))
+			continue;
+
+		git_oid_fmt(oid_str, &entries[i].merge_head->oid);
+		oid_str[GIT_OID_HEXSZ] = '\0';
+
+		if ((error = git_filebuf_printf(&file, "; commit '%s'", oid_str)) < 0)
+			goto cleanup;
+	}
+
+	if ((error = git_filebuf_printf(&file, "\n")) < 0 ||
+		(error = git_filebuf_commit(&file, 0666)) < 0)
+		goto cleanup;
+
+cleanup:
+	if (error < 0)
+		git_filebuf_cleanup(&file);
+
+	git_buf_free(&file_path);
+
+	git_vector_free(&matching);
+	git__free(entries);
+
+	return error;
+}
+
+int git_merge__setup(
+	git_repository *repo,
+	const git_merge_head *our_head,
+	const git_merge_head *heads[],
+	size_t heads_len,
+	unsigned int flags)
+{
+	int error = 0;
+
+	assert (repo && our_head && heads);
+	
+	if ((error = write_orig_head(repo, our_head)) == 0 &&
+		(error = write_merge_head(repo, heads, heads_len)) == 0 &&
+		(error = write_merge_mode(repo, flags)) == 0) {
+		error = write_merge_msg(repo, heads, heads_len);
+	}
+
+	return error;
+}
+
+int git_repository_merge_cleanup(git_repository *repo)
+{
+	int error = 0;
+	git_buf merge_head_path = GIT_BUF_INIT,
+		merge_mode_path = GIT_BUF_INIT,
+		merge_msg_path = GIT_BUF_INIT;
+
+	assert(repo);
+
+	if (git_buf_joinpath(&merge_head_path, repo->path_repository, GIT_MERGE_HEAD_FILE) < 0 ||
+		git_buf_joinpath(&merge_mode_path, repo->path_repository, GIT_MERGE_MODE_FILE) < 0 ||
+		git_buf_joinpath(&merge_msg_path, repo->path_repository, GIT_MERGE_MSG_FILE) < 0)
+		return -1;
+
+	if (git_path_isfile(merge_head_path.ptr)) {
+		if ((error = p_unlink(merge_head_path.ptr)) < 0)
+			goto cleanup;
+	}
+
+	if (git_path_isfile(merge_mode_path.ptr))
+		(void)p_unlink(merge_mode_path.ptr);
+
+	if (git_path_isfile(merge_msg_path.ptr))
+		(void)p_unlink(merge_msg_path.ptr);
+
+cleanup:
+	git_buf_free(&merge_msg_path);
+	git_buf_free(&merge_mode_path);
+	git_buf_free(&merge_head_path);
+
+	return error;
+}
+
+/* Merge heads are the input to merge */
+
+static int merge_head_init(
+	git_merge_head **out,
+	git_repository *repo,
+	const char *ref_name,
+	const char *remote_url,
+	const git_oid *oid)
+{
+	git_merge_head *head;
+	int error = 0;
+
+	assert(out && oid);
+
+	*out = NULL;
+
+	head = git__calloc(1, sizeof(git_merge_head));
+	GITERR_CHECK_ALLOC(head);
+
+	if (ref_name) {
+		head->ref_name = git__strdup(ref_name);
+		GITERR_CHECK_ALLOC(head->ref_name);
+	}
+
+	if (remote_url) {
+		head->remote_url = git__strdup(remote_url);
+		GITERR_CHECK_ALLOC(head->remote_url);
+	}
+
+	git_oid_cpy(&head->oid, oid);
+
+	if ((error = git_commit_lookup(&head->commit, repo, &head->oid)) < 0) {
+		git_merge_head_free(head);
+		return error;
+	}
+
+	*out = head;
+	return error;
+}
+
+int git_merge_head_from_ref(
+	git_merge_head **out,
+	git_repository *repo,
+	git_reference *ref)
+{
+	git_reference *resolved;
+	int error = 0;
+
+	assert(out && repo && ref);
+
+	*out = NULL;
+
+	if ((error = git_reference_resolve(&resolved, ref)) < 0)
+		return error;
+	
+	error = merge_head_init(out, repo, git_reference_name(ref), NULL,
+		git_reference_target(resolved));
+
+	git_reference_free(resolved);
+	return error;
+}
+
+int git_merge_head_from_oid(
+	git_merge_head **out,
+	git_repository *repo,
+	const git_oid *oid)
+{
+	assert(out && repo && oid);
+
+	return merge_head_init(out, repo, NULL, NULL, oid);
+}
+
+int git_merge_head_from_fetchhead(
+	git_merge_head **out,
+	git_repository *repo,
+	const char *branch_name,
+	const char *remote_url,
+	const git_oid *oid)
+{
+	assert(repo && branch_name && remote_url && oid);
+
+	return merge_head_init(out, repo, branch_name, remote_url, oid);
+}
+
+void git_merge_head_free(git_merge_head *head)
+{
+	if (head == NULL)
 		return;
 
-	git_vector_free(&diff_list->staged);
-	git_vector_free(&diff_list->conflicts);
-	git_vector_free(&diff_list->resolved);
-	git_pool_clear(&diff_list->pool);
-	git__free(diff_list);
+	if (head->commit != NULL)
+		git_object_free((git_object *)head->commit);
+
+	if (head->ref_name != NULL)
+		git__free(head->ref_name);
+
+	if (head->remote_url != NULL)
+		git__free(head->remote_url);
+
+	git__free(head);
 }

src/merge.h

@@ -107,12 +107,25 @@ typedef struct {
 	git_delta_t their_status;
 } git_merge_diff;
 
+/** Internal structure for merge inputs */
+struct git_merge_head {
+	char *ref_name;
+	char *remote_url;
+
+	git_oid oid;
+	git_commit *commit;
+};
+
 int git_merge__bases_many(
 	git_commit_list **out,
 	git_revwalk *walk,
 	git_commit_list_node *one,
 	git_vector *twos);
 
+/*
+ * Three-way tree differencing
+ */
+
 git_merge_diff_list *git_merge_diff_list__alloc(git_repository *repo);
 
 int git_merge_diff_list__find_differences(git_merge_diff_list *merge_diff_list,
@@ -124,4 +137,13 @@ int git_merge_diff_list__find_renames(git_repository *repo, git_merge_diff_list
 
 void git_merge_diff_list__free(git_merge_diff_list *diff_list);
 
+/* Merge metadata setup */
+
+int git_merge__setup(
+	git_repository *repo,
+	const git_merge_head *our_head,
+	const git_merge_head *their_heads[],
+	size_t their_heads_len,
+	unsigned int flags);
+
 #endif

tests-clar/merge/workdir/setup.c

@@ -8,28 +8,28 @@
 static git_repository *repo;
 static git_index *repo_index;
 
-#define TEST_REPO_PATH "testrepo"
-#define TEST_INDEX_PATH TEST_REPO_PATH "/.git/index"
+#define TEST_REPO_PATH		"merge-resolve"
+#define TEST_INDEX_PATH TEST_REPO_PATH	"/.git/index"
 
-#define ORIG_HEAD                   "bd593285fc7fe4ca18ccdbabf027f5d689101452"
+#define ORIG_HEAD			"bd593285fc7fe4ca18ccdbabf027f5d689101452"
 
-#define THEIRS_SIMPLE_BRANCH        "branch"
-#define THEIRS_SIMPLE_OID           "7cb63eed597130ba4abb87b3e544b85021905520"
+#define THEIRS_SIMPLE_BRANCH	"branch"
+#define THEIRS_SIMPLE_OID	"7cb63eed597130ba4abb87b3e544b85021905520"
 
-#define OCTO1_BRANCH                "octo1"
-#define OCTO1_OID                   "16f825815cfd20a07a75c71554e82d8eede0b061"
+#define OCTO1_BRANCH		"octo1"
+#define OCTO1_OID			"16f825815cfd20a07a75c71554e82d8eede0b061"
 
-#define OCTO2_BRANCH                "octo2"
-#define OCTO2_OID                   "158dc7bedb202f5b26502bf3574faa7f4238d56c"
+#define OCTO2_BRANCH		"octo2"
+#define OCTO2_OID			"158dc7bedb202f5b26502bf3574faa7f4238d56c"
 
-#define OCTO3_BRANCH                "octo3"
-#define OCTO3_OID                   "50ce7d7d01217679e26c55939eef119e0c93e272"
+#define OCTO3_BRANCH		"octo3"
+#define OCTO3_OID			"50ce7d7d01217679e26c55939eef119e0c93e272"
 
-#define OCTO4_BRANCH                "octo4"
-#define OCTO4_OID                   "54269b3f6ec3d7d4ede24dd350dd5d605495c3ae"
+#define OCTO4_BRANCH		"octo4"
+#define OCTO4_OID			"54269b3f6ec3d7d4ede24dd350dd5d605495c3ae"
 
-#define OCTO5_BRANCH                "octo5"
-#define OCTO5_OID                   "e4f618a2c3ed0669308735727df5ebf2447f022f"
+#define OCTO5_BRANCH		"octo5"
+#define OCTO5_OID			"e4f618a2c3ed0669308735727df5ebf2447f022f"
 
 // Fixture setup and teardown
 void test_merge_workdir_setup__initialize(void)
@@ -44,6 +44,22 @@ void test_merge_workdir_setup__cleanup(void)
 	cl_git_sandbox_cleanup();
 }
 
+static bool test_file_contents(const char *filename, const char *expected)
+{
+	git_buf file_path_buf = GIT_BUF_INIT, file_buf = GIT_BUF_INIT;
+	bool equals;
+	
+	git_buf_printf(&file_path_buf, "%s/%s", git_repository_path(repo), filename);
+	
+	cl_git_pass(git_futils_readbuffer(&file_buf, file_path_buf.ptr));
+	equals = (strcmp(file_buf.ptr, expected) == 0);
+
+	git_buf_free(&file_path_buf);
+	git_buf_free(&file_buf);
+	
+	return equals;
+}
+
 static void write_file_contents(const char *filename, const char *output)
 {
 	git_buf file_path_buf = GIT_BUF_INIT;
@@ -55,6 +71,816 @@ static void write_file_contents(const char *filename, const char *output)
 	git_buf_free(&file_path_buf);
 }
 
+/* git merge --no-ff octo1 */
+void test_merge_workdir_setup__one_branch(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_merge_head *our_head, *their_heads[1];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+	
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 1, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branch '" OCTO1_BRANCH "'\n"));
+
+	git_reference_free(octo1_ref);
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+}
+
+/* git merge --no-ff 16f825815cfd20a07a75c71554e82d8eede0b061 */
+void test_merge_workdir_setup__one_oid(void)
+{
+	git_oid our_oid;
+	git_oid octo1_oid;
+	git_merge_head *our_head, *their_heads[1];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[0], repo, &octo1_oid));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 1, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge commit '" OCTO1_OID "'\n"));
+
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+}
+
+/* git merge octo1 octo2 */
+void test_merge_workdir_setup__two_branches(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_reference *octo2_ref;
+	git_merge_head *our_head, *their_heads[2];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 2, 0));
+	
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branches '" OCTO1_BRANCH "' and '" OCTO2_BRANCH "'\n"));
+	
+	git_reference_free(octo1_ref);
+	git_reference_free(octo2_ref);
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+}
+
+/* git merge octo1 octo2 octo3 */
+void test_merge_workdir_setup__three_branches(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_reference *octo2_ref;
+	git_reference *octo3_ref;
+	git_merge_head *our_head, *their_heads[3];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+	
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+
+	cl_git_pass(git_reference_lookup(&octo3_ref, repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[2], repo, octo3_ref));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 3, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branches '" OCTO1_BRANCH "', '" OCTO2_BRANCH "' and '" OCTO3_BRANCH "'\n"));
+	
+	git_reference_free(octo1_ref);
+	git_reference_free(octo2_ref);
+	git_reference_free(octo3_ref);
+
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+}
+
+/* git merge 16f825815cfd20a07a75c71554e82d8eede0b061 158dc7bedb202f5b26502bf3574faa7f4238d56c 50ce7d7d01217679e26c55939eef119e0c93e272 */
+void test_merge_workdir_setup__three_oids(void)
+{
+	git_oid our_oid;
+	git_oid octo1_oid;
+	git_oid octo2_oid;
+	git_oid octo3_oid;
+	git_merge_head *our_head, *their_heads[3];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[0], repo, &octo1_oid));
+	
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[1], repo, &octo2_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[2], repo, &octo3_oid));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 3, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge commit '" OCTO1_OID "'; commit '" OCTO2_OID "'; commit '" OCTO3_OID "'\n"));
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+}
+
+/* git merge octo1 158dc7bedb202f5b26502bf3574faa7f4238d56c */
+void test_merge_workdir_setup__branches_and_oids_1(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_oid octo2_oid;
+	git_merge_head *our_head, *their_heads[2];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[1], repo, &octo2_oid));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 2, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branch '" OCTO1_BRANCH "'; commit '" OCTO2_OID "'\n"));
+	
+	git_reference_free(octo1_ref);
+
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+}
+
+/* git merge octo1 158dc7bedb202f5b26502bf3574faa7f4238d56c octo3 54269b3f6ec3d7d4ede24dd350dd5d605495c3ae */
+void test_merge_workdir_setup__branches_and_oids_2(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_oid octo2_oid;
+	git_reference *octo3_ref;
+	git_oid octo4_oid;
+	git_merge_head *our_head, *their_heads[4];
+
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+	
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[1], repo, &octo2_oid));
+
+	cl_git_pass(git_reference_lookup(&octo3_ref, repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[2], repo, octo3_ref));
+	
+	cl_git_pass(git_oid_fromstr(&octo4_oid, OCTO4_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[3], repo, &octo4_oid));
+	
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 4, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n" OCTO4_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branches '" OCTO1_BRANCH "' and '" OCTO3_BRANCH "'; commit '" OCTO2_OID "'; commit '" OCTO4_OID "'\n"));
+	
+	git_reference_free(octo1_ref);
+	git_reference_free(octo3_ref);
+
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+	git_merge_head_free(their_heads[3]);
+}
+
+/* git merge 16f825815cfd20a07a75c71554e82d8eede0b061 octo2 50ce7d7d01217679e26c55939eef119e0c93e272 octo4 */
+void test_merge_workdir_setup__branches_and_oids_3(void)
+{
+	git_oid our_oid;
+	git_oid octo1_oid;
+	git_reference *octo2_ref;
+	git_oid octo3_oid;
+	git_reference *octo4_ref;
+	git_merge_head *our_head, *their_heads[4];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[0], repo, &octo1_oid));
+
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[2], repo, &octo3_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo4_ref, repo, GIT_REFS_HEADS_DIR OCTO4_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[3], repo, octo4_ref));
+	
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 4, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n" OCTO4_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge commit '" OCTO1_OID "'; branches '" OCTO2_BRANCH "' and '" OCTO4_BRANCH "'; commit '" OCTO3_OID "'\n"));
+	
+	git_reference_free(octo2_ref);
+	git_reference_free(octo4_ref);
+
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+	git_merge_head_free(their_heads[3]);
+}
+
+/* git merge 16f825815cfd20a07a75c71554e82d8eede0b061 octo2 50ce7d7d01217679e26c55939eef119e0c93e272 octo4 octo5 */
+void test_merge_workdir_setup__branches_and_oids_4(void)
+{
+	git_oid our_oid;
+	git_oid octo1_oid;
+	git_reference *octo2_ref;
+	git_oid octo3_oid;
+	git_reference *octo4_ref;
+	git_reference *octo5_ref;
+	git_merge_head *our_head, *their_heads[5];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[0], repo, &octo1_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+	
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[2], repo, &octo3_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo4_ref, repo, GIT_REFS_HEADS_DIR OCTO4_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[3], repo, octo4_ref));
+
+	cl_git_pass(git_reference_lookup(&octo5_ref, repo, GIT_REFS_HEADS_DIR OCTO5_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[4], repo, octo5_ref));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 5, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n" OCTO4_OID "\n" OCTO5_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge commit '" OCTO1_OID "'; branches '" OCTO2_BRANCH "', '" OCTO4_BRANCH "' and '" OCTO5_BRANCH "'; commit '" OCTO3_OID "'\n"));
+	
+	git_reference_free(octo2_ref);
+	git_reference_free(octo4_ref);
+	git_reference_free(octo5_ref);
+
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+	git_merge_head_free(their_heads[3]);
+	git_merge_head_free(their_heads[4]);
+}
+
+/* git merge octo1 octo1 octo1 */
+void test_merge_workdir_setup__three_same_branches(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_1_ref;
+	git_reference *octo1_2_ref;
+	git_reference *octo1_3_ref;
+	git_merge_head *our_head, *their_heads[3];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo1_1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_1_ref));
+	
+	cl_git_pass(git_reference_lookup(&octo1_2_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo1_2_ref));
+	
+	cl_git_pass(git_reference_lookup(&octo1_3_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[2], repo, octo1_3_ref));
+	
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 3, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO1_OID "\n" OCTO1_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branches '" OCTO1_BRANCH "', '" OCTO1_BRANCH "' and '" OCTO1_BRANCH "'\n"));
+	
+	git_reference_free(octo1_1_ref);
+	git_reference_free(octo1_2_ref);
+	git_reference_free(octo1_3_ref);
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+}
+
+/* git merge 16f825815cfd20a07a75c71554e82d8eede0b061 16f825815cfd20a07a75c71554e82d8eede0b061 16f825815cfd20a07a75c71554e82d8eede0b061 */
+void test_merge_workdir_setup__three_same_oids(void)
+{
+	git_oid our_oid;
+	git_oid octo1_1_oid;
+	git_oid octo1_2_oid;
+	git_oid octo1_3_oid;
+	git_merge_head *our_head, *their_heads[3];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_oid_fromstr(&octo1_1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[0], repo, &octo1_1_oid));
+	
+	cl_git_pass(git_oid_fromstr(&octo1_2_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[1], repo, &octo1_2_oid));
+	
+	cl_git_pass(git_oid_fromstr(&octo1_3_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_oid(&their_heads[2], repo, &octo1_3_oid));
+	
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 3, 0));
+	
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO1_OID "\n" OCTO1_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge commit '" OCTO1_OID "'; commit '" OCTO1_OID "'; commit '" OCTO1_OID "'\n"));
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+}
+
+static int create_remote_tracking_branch(const char *branch_name, const char *oid_str)
+{
+	int error = 0;
+
+	git_buf remotes_path = GIT_BUF_INIT,
+		origin_path = GIT_BUF_INIT,
+		filename = GIT_BUF_INIT,
+		data = GIT_BUF_INIT;
+
+	if ((error = git_buf_puts(&remotes_path, git_repository_path(repo))) < 0 ||
+		(error = git_buf_puts(&remotes_path, GIT_REFS_REMOTES_DIR)) < 0)
+		goto done;
+
+	if (!git_path_exists(git_buf_cstr(&remotes_path)) &&
+		(error = p_mkdir(git_buf_cstr(&remotes_path), 0777)) < 0)
+		goto done;
+
+	if ((error = git_buf_puts(&origin_path, git_buf_cstr(&remotes_path))) < 0 ||
+		(error = git_buf_puts(&origin_path, "origin")) < 0)
+		goto done;
+
+	if (!git_path_exists(git_buf_cstr(&origin_path)) &&
+		(error = p_mkdir(git_buf_cstr(&origin_path), 0777)) < 0)
+		goto done;
+
+	if ((error = git_buf_puts(&filename, git_buf_cstr(&origin_path))) < 0 ||
+		(error = git_buf_puts(&filename, "/")) < 0 ||
+		(error = git_buf_puts(&filename, branch_name)) < 0 ||
+		(error = git_buf_puts(&data, oid_str)) < 0 ||
+		(error = git_buf_puts(&data, "\n")) < 0)
+		goto done;
+
+	cl_git_rewritefile(git_buf_cstr(&filename), git_buf_cstr(&data));
+
+done:
+	git_buf_free(&remotes_path);
+	git_buf_free(&origin_path);
+	git_buf_free(&filename);
+	git_buf_free(&data);
+
+	return error;
+}
+
+/* git merge refs/remotes/origin/octo1 */
+void test_merge_workdir_setup__remote_tracking_one_branch(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_merge_head *our_head, *their_heads[1];
+
+	cl_git_pass(create_remote_tracking_branch(OCTO1_BRANCH, OCTO1_OID));
+
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+	
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 1, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge remote-tracking branch 'refs/remotes/origin/" OCTO1_BRANCH "'\n"));
+
+	git_reference_free(octo1_ref);
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+}
+
+/* git merge refs/remotes/origin/octo1 refs/remotes/origin/octo2 */
+void test_merge_workdir_setup__remote_tracking_two_branches(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_reference *octo2_ref;
+	git_merge_head *our_head, *their_heads[2];
+
+	cl_git_pass(create_remote_tracking_branch(OCTO1_BRANCH, OCTO1_OID));
+	cl_git_pass(create_remote_tracking_branch(OCTO2_BRANCH, OCTO2_OID));
+
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 2, 0));
+	
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge remote-tracking branches 'refs/remotes/origin/" OCTO1_BRANCH "' and 'refs/remotes/origin/" OCTO2_BRANCH "'\n"));
+	
+	git_reference_free(octo1_ref);
+	git_reference_free(octo2_ref);
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+}
+
+/* git merge refs/remotes/origin/octo1 refs/remotes/origin/octo2 refs/remotes/origin/octo3 */
+void test_merge_workdir_setup__remote_tracking_three_branches(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_reference *octo2_ref;
+	git_reference *octo3_ref;
+	git_merge_head *our_head, *their_heads[3];
+
+	cl_git_pass(create_remote_tracking_branch(OCTO1_BRANCH, OCTO1_OID));
+	cl_git_pass(create_remote_tracking_branch(OCTO2_BRANCH, OCTO2_OID));
+	cl_git_pass(create_remote_tracking_branch(OCTO3_BRANCH, OCTO3_OID));
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+	
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+
+	cl_git_pass(git_reference_lookup(&octo3_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO3_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[2], repo, octo3_ref));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 3, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge remote-tracking branches 'refs/remotes/origin/" OCTO1_BRANCH "', 'refs/remotes/origin/" OCTO2_BRANCH "' and 'refs/remotes/origin/" OCTO3_BRANCH "'\n"));
+	
+	git_reference_free(octo1_ref);
+	git_reference_free(octo2_ref);
+	git_reference_free(octo3_ref);
+
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+}
+
+/* git merge octo1 refs/remotes/origin/octo2 */
+void test_merge_workdir_setup__normal_branch_and_remote_tracking_branch(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_reference *octo2_ref;
+	git_merge_head *our_head, *their_heads[2];
+
+	cl_git_pass(create_remote_tracking_branch(OCTO2_BRANCH, OCTO2_OID));
+
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 2, 0));
+	
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branch '" OCTO1_BRANCH "', remote-tracking branch 'refs/remotes/origin/" OCTO2_BRANCH "'\n"));
+	
+	git_reference_free(octo1_ref);
+	git_reference_free(octo2_ref);
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+}
+
+/* git merge refs/remotes/origin/octo1 octo2 */
+void test_merge_workdir_setup__remote_tracking_branch_and_normal_branch(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_reference *octo2_ref;
+	git_merge_head *our_head, *their_heads[2];
+
+	cl_git_pass(create_remote_tracking_branch(OCTO1_BRANCH, OCTO1_OID));
+
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 2, 0));
+	
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branch '" OCTO2_BRANCH "', remote-tracking branch 'refs/remotes/origin/" OCTO1_BRANCH "'\n"));
+	
+	git_reference_free(octo1_ref);
+	git_reference_free(octo2_ref);
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+}
+
+/* git merge octo1 refs/remotes/origin/octo2 octo3 refs/remotes/origin/octo4 */
+void test_merge_workdir_setup__two_remote_tracking_branch_and_two_normal_branches(void)
+{
+	git_oid our_oid;
+	git_reference *octo1_ref;
+	git_reference *octo2_ref;
+	git_reference *octo3_ref;
+	git_reference *octo4_ref;
+	git_merge_head *our_head, *their_heads[4];
+
+	cl_git_pass(create_remote_tracking_branch(OCTO2_BRANCH, OCTO2_OID));
+	cl_git_pass(create_remote_tracking_branch(OCTO4_BRANCH, OCTO4_OID));
+
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+	
+	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[0], repo, octo1_ref));
+
+	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO2_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[1], repo, octo2_ref));
+
+	cl_git_pass(git_reference_lookup(&octo3_ref, repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[2], repo, octo3_ref));
+
+	cl_git_pass(git_reference_lookup(&octo4_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO4_BRANCH));
+	cl_git_pass(git_merge_head_from_ref(&their_heads[3], repo, octo4_ref));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 4, 0));
+	
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n" OCTO4_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branches '" OCTO1_BRANCH "' and '" OCTO3_BRANCH "', remote-tracking branches 'refs/remotes/origin/" OCTO2_BRANCH "' and 'refs/remotes/origin/" OCTO4_BRANCH "'\n"));
+	
+	git_reference_free(octo1_ref);
+	git_reference_free(octo2_ref);
+	git_reference_free(octo3_ref);
+	git_reference_free(octo4_ref);
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+	git_merge_head_free(their_heads[3]);
+}
+
+/* git pull origin branch octo1 */
+void test_merge_workdir_setup__pull_one(void)
+{
+	git_oid our_oid;
+	git_oid octo1_1_oid;
+	git_merge_head *our_head, *their_heads[1];
+
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo1_1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.url/repo.git", &octo1_1_oid));
+	
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 1, 0));
+	
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branch 'octo1' of http://remote.url/repo.git\n"));
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+}
+
+/* git pull origin octo1 octo2 */
+void test_merge_workdir_setup__pull_two(void)
+{
+	git_oid our_oid;
+	git_oid octo1_oid;
+	git_oid octo2_oid;
+	git_merge_head *our_head, *their_heads[2];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.url/repo.git", &octo1_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[1], repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH, "http://remote.url/repo.git", &octo2_oid));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 2, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branches '" OCTO1_BRANCH "' and '" OCTO2_BRANCH "' of http://remote.url/repo.git\n"));
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+}
+
+/* git pull origin octo1 octo2 octo3 */
+void test_merge_workdir_setup__pull_three(void)
+{
+	git_oid our_oid;
+	git_oid octo1_oid;
+	git_oid octo2_oid;
+	git_oid octo3_oid;
+	git_merge_head *our_head, *their_heads[3];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.url/repo.git", &octo1_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[1], repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH, "http://remote.url/repo.git", &octo2_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[2], repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH, "http://remote.url/repo.git", &octo3_oid));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 3, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branches '" OCTO1_BRANCH "', '" OCTO2_BRANCH "' and '" OCTO3_BRANCH "' of http://remote.url/repo.git\n"));
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+}
+
+void test_merge_workdir_setup__three_remotes(void)
+{
+	git_oid our_oid;
+	git_oid octo1_oid;
+	git_oid octo2_oid;
+	git_oid octo3_oid;
+	git_merge_head *our_head, *their_heads[3];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.first/repo.git", &octo1_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[1], repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH, "http://remote.second/repo.git", &octo2_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[2], repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH, "http://remote.third/repo.git", &octo3_oid));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 3, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branch '" OCTO1_BRANCH "' of http://remote.first/repo.git, branch '" OCTO2_BRANCH "' of http://remote.second/repo.git, branch '" OCTO3_BRANCH "' of http://remote.third/repo.git\n"));
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+}
+
+void test_merge_workdir_setup__two_remotes(void)
+{
+	git_oid our_oid;
+	git_oid octo1_oid;
+	git_oid octo2_oid;
+	git_oid octo3_oid;
+	git_oid octo4_oid;
+	git_merge_head *our_head, *their_heads[4];
+	
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_merge_head_from_oid(&our_head, repo, &our_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.first/repo.git", &octo1_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[1], repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH, "http://remote.second/repo.git", &octo2_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[2], repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH, "http://remote.first/repo.git", &octo3_oid));
+
+	cl_git_pass(git_oid_fromstr(&octo4_oid, OCTO4_OID));
+	cl_git_pass(git_merge_head_from_fetchhead(&their_heads[3], repo, GIT_REFS_HEADS_DIR OCTO4_BRANCH, "http://remote.second/repo.git", &octo4_oid));
+
+	cl_git_pass(git_merge__setup(repo, our_head, (const git_merge_head **)their_heads, 4, 0));
+
+	cl_assert(test_file_contents(GIT_MERGE_HEAD_FILE, OCTO1_OID "\n" OCTO2_OID "\n" OCTO3_OID "\n" OCTO4_OID "\n"));
+	cl_assert(test_file_contents(GIT_ORIG_HEAD_FILE, ORIG_HEAD "\n"));
+	cl_assert(test_file_contents(GIT_MERGE_MODE_FILE, ""));
+	cl_assert(test_file_contents(GIT_MERGE_MSG_FILE, "Merge branches '" OCTO1_BRANCH "' and '" OCTO3_BRANCH "' of http://remote.first/repo.git, branches '" OCTO2_BRANCH "' and '" OCTO4_BRANCH "' of http://remote.second/repo.git\n"));
+	
+	git_merge_head_free(our_head);
+	git_merge_head_free(their_heads[0]);
+	git_merge_head_free(their_heads[1]);
+	git_merge_head_free(their_heads[2]);
+	git_merge_head_free(their_heads[3]);
+}
+
 struct merge_head_cb_data {
 	const char **oid_str;
 	unsigned int len;