Filters/Filter: expand test coverage for the Filter::accept() method

This commit expands the Filter::accept() tests to cover cases that were
not covered before:
  - Run the tests on Windows as there is dedicated code when the
  directory separator is "\".
  - Real directories trigger code that relies on is_dir() returning `true`.
  - Sets Config::$local to `true` and ensure in this case directories
  are not accepted.
  - Files without an extension, with an invalid one or starting with a
  dot are ignored.
  - Duplicated files are ignored.
  - Relative exclude patterns are handled correctly.

Author: rodrigoprimo

tests/Core/Filters/Filter/AcceptTest.php

@@ -20,6 +20,7 @@
  * Tests for the \PHP_CodeSniffer\Filters\Filter::accept method.
  *
  * @covers \PHP_CodeSniffer\Filters\Filter
+ * @group  Windows
  */
 final class AcceptTest extends AbstractFilterTestCase
 {
@@ -46,16 +47,23 @@ public static function initializeConfigAndRuleset()
      *
      * @param array<string> $inputPaths     List of file paths to be filtered.
      * @param array<string> $expectedOutput Expected filtering result.
+     * @param bool          $localFiles     Value of the Config class "local" setting (default: false).
      *
      * @dataProvider dataExcludePatterns
      *
      * @return void
      */
-    public function testExcludePatterns($inputPaths, $expectedOutput)
+    public function testExcludePatterns($inputPaths, $expectedOutput, $localFiles=false)
     {
         $fakeDI = new RecursiveArrayIterator($inputPaths);
         $filter = new Filter($fakeDI, '/', self::$config, self::$ruleset);
 
+        self::$config->local = false;
+
+        if ($localFiles === true) {
+            self::$config->local = true;
+        }
+
         $this->assertSame($expectedOutput, $this->getFilteredResultsAsArray($filter));
 
     }//end testExcludePatterns()
@@ -99,6 +107,60 @@ public static function dataExcludePatterns()
                     '/path/to/src/anything-generic/Main.php',
                 ],
             ],
+            'Filter should exclude files without an extension, using unsupported extension and starting with a dot'             => [
+                'inputPaths'     => [
+                    '/path/to/src/Main.php',
+                    '/path/to/src/.hiddenfile',
+                    '/path/to/src/NoExtension',
+                    '/path/to/src/UnsupportedExtension.txt',
+                    '/path/to/src/UnsupportedExtension.php.bak',
+                ],
+                'expectedOutput' => [
+                    '/path/to/src/Main.php',
+                ],
+            ],
+            'Filter should ignore duplicate files'                                                                              => [
+                'inputPaths'     => [
+                    __FILE__,
+                    __FILE__,
+                    '/path/to/src/Main.php',
+                ],
+                'expectedOutput' => [
+                    __FILE__,
+                    '/path/to/src/Main.php',
+                ],
+            ],
+            'Filter should work for relative exclude patterns'                                                                  => [
+                'inputPaths'     => [
+                    'src/Main.php',
+                    'src/AnotherDir/File.php',
+                ],
+                'expectedOutput' => [
+                    'src/Main.php',
+                ],
+            ],
+
+            // Uses real directories to test code that calls is_dir().
+            'Filter should handle directories'                                                                                  => [
+                'inputPaths'     => [
+                    self::getBaseDir().'/src/Generators',
+                    self::getBaseDir().'/src/Standards',
+                ],
+                'expectedOutput' => [
+                    self::getBaseDir().'/src/Standards',
+                ],
+            ],
+            'Filter should ignore directories when --local is used'                                                             => [
+                'inputPaths'     => [
+                    'src/Main.php',
+                    self::getBaseDir().'/src/Generators',
+                    self::getBaseDir().'/src/Standards',
+                ],
+                'expectedOutput' => [
+                    'src/Main.php',
+                ],
+                'localFiles'     => true,
+            ],
         ];
 
         // Allow these tests to work on Windows as well.

tests/Core/Filters/Filter/AcceptTest.xml

@@ -2,11 +2,15 @@
 <ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="AcceptTest" xsi:noNamespaceSchemaLocation="phpcs.xsd">
     <description>Ruleset to test the filtering based on exclude patterns.</description>
 
-    <!-- Directory pattern. -->
+    <!-- Directory patterns. -->
     <exclude-pattern>*/something/*</exclude-pattern>
+    <exclude-pattern>*/src/Generators/*</exclude-pattern>
     <!-- File pattern. -->
     <exclude-pattern>*/Other/Main\.php$</exclude-pattern>
 
+    <!-- Relative directory pattern. -->
+    <exclude-pattern type="relative">/AnotherDir/*</exclude-pattern>
+
     <rule ref="Generic">
         <exclude name="Generic.Debug"/>