win32: test checkout msg on long path err

tests/win32/longpath.c

+#include "clar_libgit2.h"
+
+#include "git2/clone.h"
+#include "clone.h"
+#include "buffer.h"
+#include "fileops.h"
+
+static git_buf path = GIT_BUF_INIT;
+
+void test_win32_longpath__initialize(void)
+{
+#ifdef GIT_WIN32
+	const char *base = clar_sandbox_path();
+	size_t base_len = strlen(base);
+	size_t remain = MAX_PATH - base_len;
+	size_t i;
+
+	git_buf_clear(&path);
+	git_buf_puts(&path, base);
+	git_buf_putc(&path, '/');
+
+	cl_assert(remain < (MAX_PATH - 5));
+
+	for (i = 0; i < (remain - 5); i++)
+		git_buf_putc(&path, 'a');
+
+	printf("%s %" PRIuZ "\n", path.ptr, path.size);
+#endif
+}
+
+void test_win32_longpath__cleanup(void)
+{
+	git_buf_free(&path);
+}
+
+#ifdef GIT_WIN32
+void assert_name_too_long(void)
+{
+	const git_error *err;
+	size_t expected_len, actual_len;
+	const char *expected_msg;
+
+	err = giterr_last();
+	actual_len = strlen(err->message);
+
+	expected_msg = git_win32_get_error_message(ERROR_FILENAME_EXCED_RANGE);
+	expected_len = strlen(expected_msg);
+
+	/* check the suffix */
+	cl_assert_equal_s(expected_msg, err->message + (actual_len - expected_len));
+}
+#endif
+
+void test_win32_longpath__errmsg_on_checkout(void)
+{
+#ifdef GIT_WIN32
+	git_repository *repo;
+
+	cl_git_fail(git_clone(&repo, cl_fixture("testrepo.git"), path.ptr, NULL));
+	assert_name_too_long();
+#endif
+}