tree: add test to ensure predictability of generation of object ids

tests-clay/clay.h

@@ -158,6 +158,9 @@ extern void test_object_raw_size__validate_oid_size(void);
 extern void test_object_raw_type2string__check_type_is_loose(void);
 extern void test_object_raw_type2string__convert_string_to_type(void);
 extern void test_object_raw_type2string__convert_type_to_string(void);
+extern void test_object_tree_buildfromindex__cleanup(void);
+extern void test_object_tree_buildfromindex__generate_predictable_object_ids(void);
+extern void test_object_tree_buildfromindex__initialize(void);
 extern void test_object_tree_frompath__cleanup(void);
 extern void test_object_tree_frompath__fail_when_processing_an_invalid_path(void);
 extern void test_object_tree_frompath__fail_when_processing_an_unknown_tree_segment(void);

tests-clay/clay_main.c

@@ -245,6 +245,9 @@ static const struct clay_func _clay_cb_object_raw_type2string[] = {
 	{"convert_string_to_type", &test_object_raw_type2string__convert_string_to_type},
 	{"convert_type_to_string", &test_object_raw_type2string__convert_type_to_string}
 };
+static const struct clay_func _clay_cb_object_tree_buildfromindex[] = {
+    {"generate_predictable_object_ids", &test_object_tree_buildfromindex__generate_predictable_object_ids}
+};
 static const struct clay_func _clay_cb_object_tree_frompath[] = {
     {"fail_when_processing_an_invalid_path", &test_object_tree_frompath__fail_when_processing_an_invalid_path},
 	{"fail_when_processing_an_unknown_tree_segment", &test_object_tree_frompath__fail_when_processing_an_unknown_tree_segment},
@@ -438,6 +441,12 @@ static const struct clay_suite _clay_suites[] = {
         _clay_cb_object_raw_type2string, 3
     },
 	{
+        "object::tree::buildfromindex",
+        {"initialize", &test_object_tree_buildfromindex__initialize},
+        {"cleanup", &test_object_tree_buildfromindex__cleanup},
+        _clay_cb_object_tree_buildfromindex, 1
+    },
+	{
         "object::tree::frompath",
         {"initialize", &test_object_tree_frompath__initialize},
         {"cleanup", &test_object_tree_frompath__cleanup},
@@ -493,8 +502,8 @@ static const struct clay_suite _clay_suites[] = {
     }
 };
 
-static size_t _clay_suite_count = 34;
-static size_t _clay_callback_count = 113;
+static size_t _clay_suite_count = 35;
+static size_t _clay_callback_count = 114;
 
 /* Core test functions */
 static void

tests-clay/object/tree/buildfromindex.c

+#include "clay_libgit2.h"
+#include "posix.h"
+
+static git_repository *repo;
+
+static void file_create(const char *filename, const char *content)
+{
+	int fd;
+
+	fd = p_creat(filename, 0666);
+	cl_assert(fd != 0);
+	cl_git_pass(p_write(fd, content, strlen(content)));
+	cl_git_pass(p_close(fd));
+}
+
+void test_object_tree_buildfromindex__initialize(void)
+{
+	cl_fixture("treebuilder");
+	cl_git_pass(git_repository_init(&repo, "treebuilder/", 0));
+	cl_git_pass(git_repository_open(&repo, "treebuilder/.git"));
+	cl_assert(repo != NULL);
+}
+
+void test_object_tree_buildfromindex__cleanup(void)
+{
+	git_repository_free(repo);
+	cl_fixture_cleanup("treebuilder");
+}
+
+void test_object_tree_buildfromindex__generate_predictable_object_ids(void)
+{
+	git_index *index;
+	git_oid blob_oid, tree_oid, expected_tree_oid;
+	git_index_entry *entry;
+
+	/*
+	 * Add a new file to the index
+	 */
+	cl_git_pass(git_repository_index(&index, repo));
+
+	file_create("treebuilder/test.txt", "test\n");
+	cl_git_pass(git_index_add(index, "test.txt", 0));
+
+	entry = git_index_get(index, 0);
+
+	/* $ echo "test" | git hash-object --stdin */
+	cl_git_pass(git_oid_fromstr(&blob_oid, "9daeafb9864cf43055ae93beb0afd6c7d144bfa4"));
+
+	cl_assert(git_oid_cmp(&blob_oid, &entry->oid) == 0);
+
+	/*
+	 * Build the tree from the index
+	 */
+	cl_git_pass(git_tree_create_fromindex(&tree_oid, index));
+
+	cl_git_pass(git_oid_fromstr(&expected_tree_oid, "2b297e643c551e76cfa1f93810c50811382f9117"));
+	cl_assert(git_oid_cmp(&expected_tree_oid, &tree_oid) == 0);
+
+	git_index_free(index);
+}