Files/TestDoubles: bug fix - not all tests were being run

There was a bug in the `glob` expression used to collect all the test case files, which meant that not all test case files were found and checked during the test runs.

Fixed now. Includes one minor, non-consequential fix to the test expectations.

Yoast/Tests/Files/TestDoublesUnitTest.php

@@ -41,7 +41,7 @@ public function setCliValues( $testFile, $config ) {
 	 */
 	protected function getTestFiles( $testFileBase ) {
 		$sep        = \DIRECTORY_SEPARATOR;
-		$test_files = \glob( \dirname( $testFileBase ) . $sep . 'TestDoublesUnitTests{' . $sep . ',' . $sep . '*' . $sep . '}*.inc', \GLOB_BRACE );
+		$test_files = \glob( \dirname( $testFileBase ) . $sep . 'TestDoublesUnitTests' . $sep . 'tests{' . $sep . ',' . $sep . '*' . $sep . '}*.inc', \GLOB_BRACE );
 
 		if ( ! empty( $test_files ) ) {
 			return $test_files;
@@ -117,7 +117,7 @@ public function getErrorList( $testFile = '' ) {
 			// In tests/mocks.
 			case 'correct-custom-dir-not-mock.inc':
 				return [
-					3 => 1,
+					4 => 1,
 				];
 
 			case 'not-double-or-mock.inc': // In tests.