Added expectNotToPerformAssertions method

src/Framework/TestCase.php

@@ -636,6 +636,11 @@ public function expectExceptionObject(\Exception $exception)
         $this->expectExceptionCode($exception->getCode());
     }
 
+    public function expectNotToPerformAssertions()
+    {
+        $this->doesNotPerformAssertions = true;
+    }
+
     /**
      * @param bool $flag
      */

tests/Framework/TestCaseTest.php

@@ -322,6 +322,19 @@ public function testWrongException()
         $this->assertCount(1, $result);
     }
 
+    public function testDoesNotPerformAssertions()
+    {
+        $test = new \DoNoAssertionTestCase('testNothing');
+        $test->expectNotToPerformAssertions();
+
+        $result = $test->run();
+
+        $this->assertTrue($result->isStrictAboutTestsThatDoNotTestAnything());
+
+        $this->assertEquals(0, $result->riskyCount());
+        $this->assertCount(1, $result);
+    }
+
     /**
      * @backupGlobals enabled
      */

tests/_files/DoNoAssertionTestCase.php

@@ -0,0 +1,9 @@
+<?php
+use PHPUnit\Framework\TestCase;
+
+class DoNoAssertionTestCase extends TestCase
+{
+    public function testNothing()
+    {
+    }
+}