Add unit tests for recent bug fixes

Add unit tests to confirm ignore directory pattern matches and
to confirm that ignore and attribute files are loaded properly
into the attribute file cache.

src/attr.c

@@ -210,6 +210,13 @@ int git_attr_add_macro(
 	return error;
 }
 
+int git_attr_cache__is_cached(git_repository *repo, const char *path)
+{
+	const char *cache_key = path;
+	if (repo && git__prefixcmp(cache_key, git_repository_workdir(repo)) == 0)
+		cache_key += strlen(git_repository_workdir(repo));
+	return (git_hashtable_lookup(repo->attrcache.files, cache_key) == NULL);
+}
 
 /* add git_attr_file to vector of files, loading if needed */
 int git_attr_cache__push_file(

src/attr.h

@@ -27,4 +27,7 @@ extern int git_attr_cache__push_file(
 	const char     *filename,
 	int (*loader)(git_repository *, const char *, git_attr_file *));
 
+/* returns GIT_SUCCESS if path is in cache */
+extern int git_attr_cache__is_cached(git_repository *repo, const char *path);
+
 #endif

tests-clar/attr/repo.c

 #include "clar_libgit2.h"
 #include "fileops.h"
 #include "git2/attr.h"
+#include "attr.h"
 
 static git_repository *g_repo = NULL;
 
@@ -89,6 +90,10 @@ void test_attr_repo__get_one(void)
 
 		git_buf_free(&b);
 	}
+
+	cl_git_pass(git_attr_cache__is_cached(g_repo, ".git/info/attributes"));
+	cl_git_pass(git_attr_cache__is_cached(g_repo, ".gitattributes"));
+	cl_git_pass(git_attr_cache__is_cached(g_repo, "sub/.gitattributes"));
 }
 
 void test_attr_repo__get_many(void)

tests-clar/status/ignore.c

 #include "clar_libgit2.h"
 #include "fileops.h"
 #include "git2/attr.h"
+#include "attr.h"
 
 static git_repository *g_repo = NULL;
 
@@ -29,6 +30,7 @@ void test_status_ignore__0(void)
 		const char *path;
 		int expected;
 	} test_cases[] = {
+		/* patterns "sub" and "ign" from .gitignore */
 		{ "file", 0 },
 		{ "ign", 1 },
 		{ "sub", 1 },
@@ -38,6 +40,12 @@ void test_status_ignore__0(void)
 		{ "sub/sub/file", 0 },
 		{ "sub/sub/ign", 1 },
 		{ "sub/sub/sub", 1 },
+		/* pattern "dir/" from .gitignore */
+		{ "dir", 1 },
+		{ "dir/", 1 },
+		{ "sub/dir", 1 },
+		{ "sub/dir/", 1 },
+		{ "sub/sub/dir", 0 }, /* dir is not actually a dir, but a file */
 		{ NULL, 0 }
 	}, *one_test;
 
@@ -46,4 +54,8 @@ void test_status_ignore__0(void)
 		cl_git_pass(git_status_should_ignore(g_repo, one_test->path, &ignored));
 		cl_assert_(ignored == one_test->expected, one_test->path);
 	}
+
+	/* confirm that ignore files were cached */
+	cl_git_pass(git_attr_cache__is_cached(g_repo, ".git/info/exclude"));
+	cl_git_pass(git_attr_cache__is_cached(g_repo, ".gitignore"));
 }

tests/resources/attr/gitignore

 sub
 ign
+dir/