+
+ /**
+ * Check whether file contains given data.
+ * @param string $fileName
+ * @param string $actualData
+ * @param bool $createIfMissing If true, and file does not exist, create it with given data
+ * and skip the test.
+ * @param string $msg
+ * @since 1.30
+ */
+ protected function assertFileContains(
+ $fileName,
+ $actualData,
+ $createIfMissing = false,
+ $msg = ''
+ ) {
+ if ( $createIfMissing ) {
+ if ( !file_exists( $fileName ) ) {
+ file_put_contents( $fileName, $actualData );
+ $this->markTestSkipped( "Data file $fileName does not exist" );
+ }
+ } else {
+ self::assertFileExists( $fileName );
+ }
+ self::assertEquals( file_get_contents( $fileName ), $actualData, $msg );
+ }