Added ClearCapableContainerInterface and test

Author: XedinUnknown

src/ClearCapableContainerInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Dhii\Data\Container;
+
+use Psr\Container\ContainerInterface as BaseContainerInterface;
+
+/**
+ * A container that can have its members cleared
+ *
+ * @since [*next-version*]
+ */
+interface ClearCapableContainerInterface extends
+    BaseContainerInterface,
+    ClearCapableInterface
+{
+}

test/unit/ClearCapableContainerInterfaceTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Dhii\Data\Container\UnitTest;
+
+use Xpmock\TestCase;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Dhii\Data\Container\ClearCapableContainerInterface as TestSubject;
+
+/**
+ * Tests {@see TestSubject}.
+ *
+ * @since [*next-version*]
+ */
+class ClearCapableContainerInterfaceTest extends TestCase
+{
+    /**
+     * The name of the test subject.
+     *
+     * @since [*next-version*]
+     */
+    const TEST_SUBJECT_CLASSNAME = 'Dhii\Data\Container\ClearCapableContainerInterface';
+
+    /**
+     * Creates a new instance of the test subject.
+     *
+     * @since [*next-version*]
+     *
+     * @return TestSubject|MockObject The new instance.
+     */
+    public function createInstance()
+    {
+        $mock = $this->getMockBuilder(self::TEST_SUBJECT_CLASSNAME)
+                ->getMock();
+
+        return $mock;
+    }
+
+    /**
+     * Tests whether a correct instance of a descendant can be created.
+     *
+     * @since [*next-version*]
+     */
+    public function testCanBeCreated()
+    {
+        $subject = $this->createInstance();
+
+        $this->assertInstanceOf(self::TEST_SUBJECT_CLASSNAME, $subject, 'A correct instance of the test subject could not be created');
+        $this->assertInstanceOf('Dhii\Data\Container\ClearCapableInterface', $subject, 'Subject does not implement required interface');
+        $this->assertInstanceOf('Psr\Container\ContainerInterface', $subject, 'Subject does not implement required interface');
+    }
+}