Add tests for ::mtime().

Author: costdev

tests/phpunit/tests/filesystem/direct/mtime.php

@@ -0,0 +1,49 @@
+<?php
+/**
+ * Tests for the WP_Filesystem_Direct::mtime() method.
+ *
+ * @package WordPress
+ */
+
+require_once __DIR__ . '/base.php';
+
+/**
+ * @group admin
+ * @group filesystem
+ * @group filesystem-direct
+ *
+ * @covers WP_Filesystem_Direct::mtime
+ */
+class Tests_Filesystem_WpFilesystemDirect_Mtime extends WP_Filesystem_Direct_UnitTestCase {
+
+	/**
+	 * Tests that `WP_Filesystem_Direct::mtime()`
+	 * returns the correct result for a path.
+	 *
+	 * @ticket 57774
+	 *
+	 * @dataProvider data_paths_that_do_not_exist
+	 * @dataProvider data_paths_that_exist
+	 *
+	 * @param string $path     The path.
+	 * @param bool   $expected The expected result.
+	 */
+	public function test_should_determine_file_modified_time( $path, $expected ) {
+		$result    = self::$filesystem->mtime( self::$file_structure['test_dir']['path'] . $path );
+		$has_mtime = false !== $result;
+
+		$this->assertSame(
+			$expected,
+			$has_mtime,
+			'The result is not the same.'
+		);
+
+		if ( $expected ) {
+			$this->assertIsInt(
+				$result,
+				'The mtime is not an integer.'
+			);
+		}
+	}
+
+}