Add tests for OverrideConfigFromCLI step

Contains 3 test cases (well-formed array, empty array, missing option)

tests/UnitTest/Module/Config/Step/OverrideConfigFromCLITest.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace Couscous\Tests\UnitTest\Module\Config\Step;
+
+use Couscous\Module\Config\Step\OverrideConfigFromCLI;
+use Couscous\Tests\UnitTest\Mock\MockProject;
+use Psr\Log\LoggerInterface;
+
+/**
+ * @covers \Couscous\Module\Config\Step\OverrideConfigFromCLI
+ */
+class OverrideConfigFromCLITest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @test
+     */
+    public function should_override_title_if_specified()
+    {
+        $project = new MockProject();
+        $project->metadata['title'] = 'foo';
+        $project->metadata['cliConfig'] = ['title=bar'];
+
+        $logger = $this->getMock("Psr\Log\LoggerInterface");
+
+        $step = new OverrideConfigFromCLI($logger);
+        $step->__invoke($project);
+
+        $this->assertEquals('bar', $project->metadata['title']);
+    }
+
+    /**
+     * @test
+     */
+    public function should_not_override_title_if_not_specified()
+    {
+        $project = new MockProject();
+        $project->metadata['title'] = 'foo';
+        $project->metadata['cliConfig'] = [];
+
+        $logger = $this->getMock("Psr\Log\LoggerInterface");
+
+        $step = new OverrideConfigFromCLI($logger);
+        $step->__invoke($project);
+
+        $this->assertEquals('foo', $project->metadata['title']);
+    }
+
+    /**
+     * @test
+     */
+    public function should_not_override_title_if_no_cliConfig()
+    {
+        $project = new MockProject();
+        $project->metadata['title'] = 'foo';
+
+        $logger = $this->getMock("Psr\Log\LoggerInterface");
+
+        $step = new OverrideConfigFromCLI($logger);
+        $step->__invoke($project);
+
+        $this->assertEquals('foo', $project->metadata['title']);
+    }
+}