[Nostromo] Refactor Composer SelfUpdate

tests/Task/BuiltIn/Composer/SelfUpdateTaskTest.php

@@ -104,6 +104,40 @@ class SelfUpdateTaskTest extends TestCase
         }
     }
 
+    public function testSelfUpdateMustUpdateToVersionTask()
+    {
+        $runtime = new RuntimeMockup();
+        $runtime->setConfiguration(['environments' => ['test' => []]]);
+        $runtime->setEnvironment('test');
+
+        $task = new SelfUpdateTask();
+        $task->setOptions(['path' => 'composer.phar', 'version' => '1.2.0']);
+        $task->setRuntime($runtime);
+
+        try {
+            $result = $task->execute();
+            $this->assertTrue($result, 'Result should be successful');
+        } catch (Exception $exception) {
+            if ($exception instanceof SkipException) {
+                $this->assertTrue(false, 'Update should not have been skipped');
+            }
+        }
+
+        $ranCommands = $runtime->getRanCommands();
+        $testCase = array(
+            0 => 'composer.phar --version',
+            1 => 'composer.phar self-update 1.2.0',
+        );
+
+        // Check total of Executed Commands
+        $this->assertEquals(count($testCase), count($ranCommands));
+
+        // Check Generated Commands
+        foreach ($testCase as $index => $command) {
+            $this->assertEquals($command, $ranCommands[$index]);
+        }
+    }
+
     public function testSelfUpdateWrongOutputTask()
     {
         $runtime = new RuntimeMockup();