Add tests for ::is_writable().

Author: costdev

tests/phpunit/tests/filesystem/wpFilesystemDirect/isWritable.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * Tests for the WP_Filesystem_Direct::is_writable() method.
+ *
+ * @package WordPress
+ */
+
+require_once __DIR__ . '/base.php';
+
+/**
+ * @group admin
+ * @group filesystem
+ * @group filesystem-direct
+ *
+ * @covers WP_Filesystem_Direct::is_writable
+ */
+class Tests_Filesystem_WpFilesystemDirect_IsWritable extends WP_Filesystem_Direct_UnitTestCase {
+
+	/**
+	 * Tests that `WP_Filesystem_Direct::is_writable()` determines that
+	 * a path is writable.
+	 *
+	 * @ticket 57774
+	 *
+	 * @dataProvider data_paths_that_exist
+	 *
+	 * @param string $path The path.
+	 */
+	public function test_should_determine_that_a_path_is_writable( $path ) {
+		$this->assertTrue( self::$filesystem->is_writable( self::$file_structure['test_dir']['path'] . $path ) );
+	}
+
+	/**
+	 * Tests that `WP_Filesystem_Direct::is_writable()` determines that
+	 * a path is not writable.
+	 *
+	 * @ticket 57774
+	 *
+	 * @dataProvider data_paths_that_do_not_exist
+	 *
+	 * @param string $path The path.
+	 */
+	public function test_should_determine_that_a_path_is_not_writable( $path ) {
+		$this->assertFalse( self::$filesystem->is_writable( self::$file_structure['test_dir']['path'] . $path ) );
+	}
+
+}