remote: write tests for cloning from an empty repo

Cloning from an empty repo must set master's upstream to origin's
master, even if neither of them exist.

Fetching from a non-empty origin must then mark the master branch
for-merge. This currently fails.

tests/clone/nonetwork.c

@@ -282,3 +282,37 @@ void test_clone_nonetwork__clone_into_updates_reflog_properly(void)
 	git_remote_free(remote);
 	git_signature_free(sig);
 }
+
+static void cleanup_repository(void *path)
+{
+	if (g_repo) {
+		git_repository_free(g_repo);
+		g_repo = NULL;
+	}
+
+	cl_fixture_cleanup((const char *)path);
+}
+
+void test_clone_nonetwork__clone_from_empty_sets_upstream(void)
+{
+	git_config *config;
+	git_repository *repo;
+	const char *str;
+
+	/* Create an empty repo to clone from */
+	cl_set_cleanup(&cleanup_repository, "./test1");
+	cl_git_pass(git_repository_init(&g_repo, "./test1", 0));
+	cl_set_cleanup(&cleanup_repository, "./repowithunborn");
+	cl_git_pass(git_clone(&repo, "./test1", "./repowithunborn", NULL));
+
+	cl_git_pass(git_repository_config(&config, repo));
+
+	cl_git_pass(git_config_get_string(&str, config, "branch.master.remote"));
+	cl_assert_equal_s("origin", str);
+	cl_git_pass(git_config_get_string(&str, config, "branch.master.merge"));
+	cl_assert_equal_s("refs/heads/master", str);
+
+	git_config_free(config);
+	git_repository_free(repo);
+	cl_fixture_cleanup("./repowithunborn");
+}

tests/fetchhead/fetchhead_data.h

@@ -28,4 +28,3 @@
 
 #define FETCH_HEAD_EXPLICIT_DATA \
 	"0966a434eb1a025db6b71485ab63a3bfbea520b6\t\tbranch 'first-merge' of git://github.com/libgit2/TestGitRepository\n"
-

tests/fetchhead/nonetwork.c

@@ -307,3 +307,39 @@ void test_fetchhead_nonetwork__invalid_description(void)
 	cl_assert(git__prefixcmp(giterr_last()->message, "Invalid description") == 0);
 }
 
+static int assert_master_for_merge(const char *ref, const char *url, const git_oid *id, unsigned int is_merge, void *data)
+{
+	GIT_UNUSED(url);
+	GIT_UNUSED(id);
+	GIT_UNUSED(data);
+
+	if (!strcmp("refs/heads/master", ref) && !is_merge)
+		return -1;
+
+	return 0;
+}
+
+void test_fetchhead_nonetwork__unborn_with_upstream(void)
+{
+	git_repository *repo;
+	git_remote *remote;
+
+	/* Create an empty repo to clone from */
+	cl_set_cleanup(&cleanup_repository, "./test1");
+	cl_git_pass(git_repository_init(&g_repo, "./test1", 0));
+	cl_set_cleanup(&cleanup_repository, "./repowithunborn");
+	cl_git_pass(git_clone(&repo, "./test1", "./repowithunborn", NULL));
+
+	/* Simulate someone pushing to it by changing to one that has stuff */
+	cl_git_pass(git_remote_load(&remote, repo, "origin"));
+	cl_git_pass(git_remote_set_url(remote, cl_fixture("testrepo.git")));
+	cl_git_pass(git_remote_save(remote));
+
+	cl_git_pass(git_remote_fetch(remote, NULL, NULL));
+	git_remote_free(remote);
+
+	cl_git_pass(git_repository_fetchhead_foreach(repo, assert_master_for_merge, NULL));
+
+	git_repository_free(repo);
+	cl_fixture_cleanup("./repowithunborn");
+}