public function createResult(DateDiffRequest $request)
 {
     return Results::calculateYearsAgo($request);
 }
 /**
  * @dataProvider yearsAgoTestCases
  */
 public function testCalculateYearsAgo(DateDiffRequest $request, $expectedValue)
 {
     $this->assertDateDiffResult(Results::YEARS_AGO, $expectedValue, Results::calculateYearsAgo($request));
 }