tests: posix: fs: Added fstat tests

Test posix fstat() function

Signed-off-by: Maksymilian Goryszewski <[email protected]>

Author: Maksymilian Goryszewski

tests/posix/fs/src/test_fs_stat.c

@@ -105,3 +105,60 @@ ZTEST(posix_fs_stat_test, test_fs_stat_dir)
 	/* note: for posix compatibility should should actually work */
 	zassert_not_equal(0, stat(TEST_ROOT, &buf));
 }
+
+/**
+ * @brief Test fstat command on file
+ *
+ * @details Tests file in root, file in directroy, and empty file
+ */
+ZTEST(posix_fs_stat_test, test_fs_fstat_file)
+{
+	struct stat buf;
+
+	int test_file_fd = open(TEST_FILE, O_RDONLY);
+	int dir_file_fd = open(TEST_DIR_FILE, O_RDONLY);
+	int empty_file_fd = open(TEST_EMPTY_FILE, O_RDONLY);
+
+	zassert_not_equal(-1, test_file_fd);
+	zassert_equal(0, fstat(test_file_fd, &buf));
+	zassert_equal(TEST_FILE_SIZE, buf.st_size);
+	zassert_equal(S_IFREG, buf.st_mode);
+	close(test_file_fd);
+
+	zassert_not_equal(-1, dir_file_fd);
+	zassert_equal(0, fstat(dir_file_fd, &buf));
+	zassert_equal(TEST_DIR_FILE_SIZE, buf.st_size);
+	zassert_equal(S_IFREG, buf.st_mode);
+	close(dir_file_fd);
+
+	zassert_not_equal(-1, empty_file_fd);
+	zassert_equal(0, fstat(empty_file_fd, &buf));
+	zassert_equal(0, buf.st_size);
+	zassert_equal(S_IFREG, buf.st_mode);
+	close(empty_file_fd);
+}
+
+/**
+ * @brief Test fstat command on dir
+ *
+ * @details Tests if we can retrieve stastics for a directory.
+ */
+ZTEST(posix_fs_stat_test, test_fs_fstat_dir)
+{
+	struct stat buf;
+
+	int fd = open(TEST_DIR, O_RDONLY);
+
+	/*
+	 * if this failed it means open doesn't support directories
+	 * so skip the rest of the test
+	 */
+	if (fd == -1) {
+		ztest_test_skip();
+	}
+
+	zassert_equal(0, fstat(fd, &buf));
+	zassert_equal(0, buf.st_size);
+	zassert_equal(S_IFDIR, buf.st_mode);
+	close(fd);
+}