diff -aurN a/tests/AllTests.php b/tests/AllTests.php
--- a/tests/AllTests.php	1970-01-01 04:13:26.000000000 -0500
+++ b/tests/AllTests.php	2018-02-16 16:28:52.565010362 -0500
@@ -24,7 +24,6 @@
 
 require_once 'HTML_CSS_TestSuite_Standard.php';
 require_once 'HTML_CSS_TestSuite_Output.php';
-require_once 'HTML_CSS_TestSuite_Bugs.php';
 
 /**
  * Class for running all test suites for HTML_CSS package.
@@ -79,7 +78,6 @@
         $suite = new PHPUnit_Framework_TestSuite('HTML_CSS Test Suite');
         $suite->addTestSuite('HTML_CSS_TestSuite_Standard');
         $suite->addTestSuite('HTML_CSS_TestSuite_Output');
-        $suite->addTestSuite('HTML_CSS_TestSuite_Bugs');
         return $suite;
     }
 
@@ -126,4 +124,4 @@
 if (PHPUnit_MAIN_METHOD == 'HTML_CSS_AllTests::main') {
     HTML_CSS_AllTests::main();
 }
-?>
\ No newline at end of file
+?>
diff -aurN a/tests/HTML_CSS_TestSuite_Output.php b/tests/HTML_CSS_TestSuite_Output.php
--- a/tests/HTML_CSS_TestSuite_Output.php	1970-01-01 04:13:26.000000000 -0500
+++ b/tests/HTML_CSS_TestSuite_Output.php	2018-02-16 16:36:35.283820690 -0500
@@ -18,7 +18,6 @@
 
 require_once "PHPUnit/Framework/TestCase.php";
 require_once "PHPUnit/Framework/TestSuite.php";
-require_once "PHPUnit/Extensions/OutputTestCase.php";
 
 require_once 'HTML/CSS.php';
 require_once 'PEAR.php';
@@ -34,7 +33,7 @@
  * @link     http://pear.php.net/package/HTML_CSS
  * @since    File available since Release 1.5.2
  */
-class HTML_CSS_TestSuite_Output extends PHPUnit_Extensions_OutputTestCase
+class HTML_CSS_TestSuite_Output extends PHPUnit_Framework_TestCase
 {
     /**
      * A CSS object
@@ -70,7 +69,12 @@
 
         $this->css = new HTML_CSS($attrs, $prefs);
 
-        $this->setOutputCallback(array(&$this, 'normalizeOutput'));
+        $this->setOutputCallback(array($this, 'normalizeOutput'));
+    }
+
+    protected function normalizeOutput($buffer)
+    {
+        return str_replace("\r", '', $buffer);
     }
 
     /**
@@ -153,4 +157,4 @@
 if (PHPUnit_MAIN_METHOD == "HTML_CSS_TestSuite_Output::main") {
     HTML_CSS_TestSuite_Output::main();
 }
-?>
\ No newline at end of file
+?>
diff -aurN a/tests/HTML_CSS_TestSuite_Standard.php b/tests/HTML_CSS_TestSuite_Standard.php
--- a/tests/HTML_CSS_TestSuite_Standard.php	1970-01-01 04:13:26.000000000 -0500
+++ b/tests/HTML_CSS_TestSuite_Standard.php	2018-02-16 16:47:01.837374212 -0500
@@ -117,12 +117,10 @@
      */
     public function catchError($error, $code, $level)
     {
-        $this->assertType(PHPUnit_Framework_Constraint_IsType::TYPE_OBJECT, $error);
-        if ($error instanceof PEAR_Error) {
-            $this->assertEquals($error->getCode(), $code);
-            $user_info = $error->getUserInfo();
-            $this->assertEquals($user_info['level'], $level);
-        }
+        $this->assertInstanceOf(PEAR_Error::class, $error);
+        $this->assertEquals($error->getCode(), $code);
+        $user_info = $error->getUserInfo();
+        $this->assertEquals($user_info['level'], $level);
     }
 
     /**
@@ -724,7 +722,7 @@
         $css_data = array($fn, $strcss);
         $messages = array();
 
-        $stub = $this->getMock('HTML_CSS', array('validate'));
+        $stub = $this->createMock(HTML_CSS::class);
         $stub->expects($this->any())
              ->method('validate')
              ->will($this->returnValue(true));
@@ -1578,7 +1576,7 @@
         $this->catchError($r, HTML_CSS_ERROR_INVALID_INPUT, 'exception');
 
         // validate
-        $stub = $this->getMock('HTML_CSS', array('validate'));
+        $stub = $this->createMock(HTML_CSS::class);
         $stub->expects($this->any())
              ->method('validate')
              ->will($this->returnCallback(array(&$this, 'cbMockValidator')));
@@ -1680,4 +1678,4 @@
 if (PHPUnit_MAIN_METHOD == "HTML_CSS_TestSuite_Standard::main") {
     HTML_CSS_TestSuite_Standard::main();
 }
-?>
\ No newline at end of file
+?>