isSuccessful() public method

public isSuccessful ( )
 public function testIsSuccessful()
 {
     $processResult = new ProcessResult(0, "aaaa");
     $this->assertEquals(true, $processResult->isSuccessful());
     $processResult = new ProcessResult(1, "aaaa");
     $this->assertEquals(false, $processResult->isSuccessful());
 }