Exercise testing utils

[AydinHassan]

So I've made this test case so we can test exercises more like integration tests rather than the messy tests we had for learn you php. So now the tests for the Match exercise look like this:

class AMatchMadeInHeavenTest extends WorkshopExerciseTest
{
    public function getApplication(): Application
    {
        return require __DIR__ . '/../../app/bootstrap.php';
    }

    public function getExerciseClass(): string
    {
        return AMatchMadeInHeaven::class;
    }

    public function testWithNoCode(): void
    {
        $this->runExercise('solution-no-code.php');

        $this->assertVerifyWasNotSuccessful();

        $this->assertResultsHasFailure(Failure::class, 'No code was found');
    }

    public function testWithNoMatch(): void
    {
        $this->runExercise('solution-no-match.php');

        $this->assertVerifyWasNotSuccessful();

        $this->assertResultsHasFailure(Failure::class, 'Match not found');
    }

    public function testWithSwitch(): void
    {
        $this->runExercise('solution-switch.php');

        $this->assertVerifyWasNotSuccessful();

        $this->assertResultsHasFailure(Failure::class, 'Switch found');
    }

    public function testWithNoMatchDefault(): void
    {
        $this->runExercise('solution-no-default.php');

        $this->assertVerifyWasNotSuccessful();

        $this->assertResultsHasFailure(Failure::class, 'Match default not found');
    }

    public function testWithIncorrectOutput(): void
    {
        $this->runExercise('solution-wrong-output.php');

        $this->assertVerifyWasNotSuccessful();

        $this->assertOutputWasIncorrect();
    }

    public function testWithCorrectSolution(): void
    {
        $this->runExercise('solution-correct.php');

        $this->assertVerifyWasSuccessful();
    }
}

[codecov-io]

Codecov Report

Merging #189 (82f3b31) into master (84196ec) will decrease coverage by 2.73%.
The diff coverage is 13.88%.

@@             Coverage Diff              @@
##             master     #189      +/-   ##
============================================
- Coverage     95.58%   92.84%   -2.74%     
- Complexity      644      661      +17     
============================================
  Files            97       98       +1     
  Lines          1971     2041      +70     
============================================
+ Hits           1884     1895      +11     
- Misses           87      146      +59     

Impacted Files	Coverage Δ	Complexity Δ
src/Application.php	33.33% <0.00%> (-1.39%)	23.00 <12.00> (+1.00)	⬇️
src/TestUtils/WorkshopExerciseTest.php	0.00% <0.00%> (ø)	11.00 <11.00> (?)
src/ExerciseRepository.php	100.00% <100.00%> (ø)	13.00 <3.00> (+3.00)
src/Utils/ArrayObject.php	100.00% <100.00%> (+5.12%)	20.00 <3.00> (+2.00)

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