Added Csv Result renderer

src/Factories/ResultsRendererFactory.php

@@ -3,13 +3,15 @@
 namespace Churn\Factories;
 
 use Churn\Renderers\Results\ConsoleResultsRenderer;
+use Churn\Renderers\Results\CsvResultsRenderer;
 use Churn\Renderers\Results\JsonResultsRenderer;
 use Churn\Renderers\Results\ResultsRendererInterface;
 use InvalidArgumentException;
 
 class ResultsRendererFactory
 {
     const FORMAT_JSON = 'json';
+    const FORMAT_CSV = 'csv';
     const FORMAT_TEXT = 'text';
 
     /**
@@ -20,6 +22,10 @@ class ResultsRendererFactory
      */
     public function getRenderer(string $format): ResultsRendererInterface
     {
+        if ($format === self::FORMAT_CSV) {
+            return new CsvResultsRenderer;
+        }
+
         if ($format === self::FORMAT_JSON) {
             return new JsonResultsRenderer;
         }

src/Renderers/Results/CsvResultsRenderer.php

@@ -0,0 +1,33 @@
+<?php declare(strict_types = 1);
+
+namespace Churn\Renderers\Results;
+
+use Churn\Results\ResultCollection;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class CsvResultsRenderer implements ResultsRendererInterface
+{
+    /**
+     * Renders the results.
+     * @param OutputInterface  $output  Output Interface.
+     * @param ResultCollection $results Result Collection.
+     * @return void
+     */
+    public function render(OutputInterface $output, ResultCollection $results)
+    {
+        $output->writeln($this->getHeader());
+
+        foreach ($results->toArray() as $result) {
+            $output->writeln(implode(';', [ '"'.$result[0].'"', $result[1], $result[2], $result[3] ]));
+        };
+    }
+
+    /**
+     * Get the header.
+     * @return string
+     */
+    private function getHeader(): string
+    {
+        return '"File";"Times Changed";"Complexity";"Score"';
+    }
+}

tests/Unit/Factories/ResultsRendererFactoryTest.php

@@ -4,6 +4,7 @@
 
 use Churn\Factories\ResultsRendererFactory;
 use Churn\Renderers\Results\ConsoleResultsRenderer;
+use Churn\Renderers\Results\CsvResultsRenderer;
 use Churn\Renderers\Results\JsonResultsRenderer;
 use Churn\Tests\BaseTestCase;
 use InvalidArgumentException;
@@ -27,6 +28,12 @@ public function it_returns_the_json_renderer_when_provided_json_format()
         $this->assertInstanceOf(JsonResultsRenderer::class, $this->factory->getRenderer('json'));
     }
 
+    /** @test **/
+    public function it_returns_the_csv_renderer_when_provided_csv_format()
+    {
+        $this->assertInstanceOf(CsvResultsRenderer::class, $this->factory->getRenderer('csv'));
+    }
+
     /** @test **/
     public function it_returns_the_console_renderer_when_provided_text_format()
     {

tests/Unit/Renderers/Results/CsvResultsRendererTest.php

@@ -0,0 +1,39 @@
+<?php
+
+use Churn\Renderers\Results\CsvResultsRenderer;
+use Churn\Results\Result;
+use Mockery as m;
+use Churn\Tests\BaseTestCase;
+use Churn\Results\ResultCollection;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class CsvResultsRendererTest extends BaseTestCase
+{
+    /** @test **/
+    public function it_can_be_instantiated()
+    {
+        $this->assertInstanceOf(CsvResultsRenderer::class, new CsvResultsRenderer);
+    }
+
+    /** @test **/
+    public function it_can_render_the_results_as_json()
+    {
+        $resultCollection = new ResultCollection([
+            new Result(['file' => 'filename1.php', 'commits' => 5, 'complexity' => 7]),
+            new Result(['file' => 'filename2.php', 'commits' => 3, 'complexity' => 4]),
+            new Result(['file' => 'filename3.php', 'commits' => 1, 'complexity' => 5]),
+            new Result(['file' => 'filename4.php', 'commits' => 1, 'complexity' => 1]),
+            new Result(['file' => 'filename5.php', 'commits' => 8, 'complexity' => 1]),
+        ]);
+
+        $output = m::mock(OutputInterface::class);
+        $output->shouldReceive('writeln')->once()->with('"File";"Times Changed";"Complexity";"Score"');
+        $output->shouldReceive('writeln')->once()->with('"filename1.php";5;7;0.625');
+        $output->shouldReceive('writeln')->once()->with('"filename2.php";3;4;0.242');
+        $output->shouldReceive('writeln')->once()->with('"filename3.php";1;5;0.08');
+        $output->shouldReceive('writeln')->once()->with('"filename4.php";1;1;-0.225');
+        $output->shouldReceive('writeln')->once()->with('"filename5.php";8;1;0.143');
+
+        (new CsvResultsRenderer)->render($output, $resultCollection);
+    }
+}