ErrorSuppressionTest::testSuppressFile(): fix bugs in test

This fixes two bugs in two test cases for the `testSuppressFile()` method:
1. The code snippet as was, contained a parse error (missing semi-colon after class instantiation).
2. The code snippet did not contain anything which would trigger the warning the test is looking for in the first place, so these two tests would always pass.

Author: jrfnl

tests/Core/ErrorSuppressionTest.php

@@ -751,7 +751,7 @@ public function testSuppressFile()
         $this->assertCount(0, $warnings);
 
         // Process late comment.
-        $content = '<?php '.PHP_EOL.'class MyClass {}'.PHP_EOL.'$foo = new MyClass()'.PHP_EOL.'// phpcs:ignoreFile';
+        $content = '<?php '.PHP_EOL.'class MyClass {}'.PHP_EOL.'$foo = new MyClass();'.PHP_EOL.'//TODO: write some code'.PHP_EOL.'// phpcs:ignoreFile';
         $file    = new DummyFile($content, $ruleset, $config);
         $file->process();
 
@@ -761,7 +761,7 @@ public function testSuppressFile()
         $this->assertCount(0, $warnings);
 
         // Process late comment (deprecated syntax).
-        $content = '<?php '.PHP_EOL.'class MyClass {}'.PHP_EOL.'$foo = new MyClass()'.PHP_EOL.'// @codingStandardsIgnoreFile';
+        $content = '<?php '.PHP_EOL.'class MyClass {}'.PHP_EOL.'$foo = new MyClass();'.PHP_EOL.'//TODO: write some code'.PHP_EOL.'// @codingStandardsIgnoreFile';
         $file    = new DummyFile($content, $ruleset, $config);
         $file->process();