Added invalid data test for Copy to complete code coverage.

Author: Paul

test/Integration/Mapper/Strategy/CopyTest.php

@@ -6,19 +6,30 @@
 
 final class CopyTest extends \PHPUnit_Framework_TestCase
 {
-    public function testWalkFixedPath()
+    public function testFixedPath()
     {
         $copy = (new Copy('foo->bar', ['foo' => ['bar' => 'baz']]))
             ->setMapper(new Mapper);
 
         self::assertSame('baz', $copy([]));
     }
 
-    public function testWalkStrategyPath()
+    public function testStrategyPath()
     {
         $copy = (new Copy(new Copy('foo'), ['bar' => 'baz']))
             ->setMapper(new Mapper);
 
         self::assertSame('baz', $copy(['foo' => 'bar']));
     }
+
+    /**
+     * Tests that null is returned when the data parameter does not resolve to an array type.
+     */
+    public function testInvalidData()
+    {
+        $copy = (new Copy('foo', 'bar'))
+            ->setMapper(new Mapper);
+
+        self::assertNull($copy(['foo' => 'bar']));
+    }
 }