remote: add test for single-branch clone

When cloning, we may be asking for a particular branch or subset of
branches. Make sure we test for that.

tests/network/remote/remotes.c

@@ -511,3 +511,64 @@ void test_network_remote_remotes__query_refspecs(void)
 
 	git_remote_free(remote);
 }
+
+static int remote_single_branch(git_remote **out, git_repository *repo, const char *name, const char *url, void *payload)
+{
+	char *fetch_refspecs[] = {
+		"refs/heads/first-merge:refs/remotes/origin/first-merge",
+	};
+	git_strarray fetch_refspecs_strarray = {
+		fetch_refspecs,
+		1,
+	};
+
+	GIT_UNUSED(payload);
+
+	cl_git_pass(git_remote_create(out, repo, name, url));
+	cl_git_pass(git_remote_set_fetch_refspecs(*out, &fetch_refspecs_strarray));
+
+	return 0;
+}
+
+void test_network_remote_remotes__single_branch(void)
+{
+	git_clone_options opts = GIT_CLONE_OPTIONS_INIT;
+	git_repository *repo;
+	git_strarray refs;
+	size_t i, count = 0;
+
+	opts.remote_cb = remote_single_branch;
+	opts.checkout_branch = "first-merge";
+
+	cl_git_pass(git_clone(&repo, "git://github.com/libgit2/TestGitRepository", "./single-branch", &opts));
+	cl_git_pass(git_reference_list(&refs, repo));
+
+	for (i = 0; i < refs.count; i++) {
+		if (!git__prefixcmp(refs.strings[i], "refs/heads/"))
+			count++;
+	}
+	cl_assert_equal_i(1, count);
+
+	git_repository_free(repo);
+}
+
+void test_network_remote_remotes__restricted_refspecs(void)
+{
+	git_clone_options opts = GIT_CLONE_OPTIONS_INIT;
+	git_repository *repo;
+	git_strarray refs;
+	size_t i, count = 0;
+
+	opts.remote_cb = remote_single_branch;
+
+	cl_git_pass(git_clone(&repo, "git://github.com/libgit2/TestGitRepository", "./restrict-refspec", &opts));
+	cl_git_pass(git_reference_list(&refs, repo));
+
+	for (i = 0; i < refs.count; i++) {
+		if (!git__prefixcmp(refs.strings[i], "refs/heads/"))
+			count++;
+	}
+	cl_assert_equal_i(1, count);
+
+	git_repository_free(repo);
+}