public function testClassKnowsIfALineHasCoverage()
 {
     $line0 = new CoveredLine("line0");
     $line1 = new CoveredLine("line1");
     $class = new CoveredClass();
     $class->addLine(0, $line0);
     $class->addLine(1, $line1);
     $this->assertFalse($class->isCovered());
     $line0->addCoverage("");
     $this->assertTrue($class->isCovered());
 }