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diff --git a/vendor/consolidation/config/tests/ConfigOverlayTest.php b/vendor/consolidation/config/tests/ConfigOverlayTest.php
new file mode 100644
index 000000000..f7faf7484
--- /dev/null
+++ b/vendor/consolidation/config/tests/ConfigOverlayTest.php
@@ -0,0 +1,168 @@
+<?php
+namespace Consolidation\Config\Util;
+
+use Consolidation\Config\Config;
+use Consolidation\Config\Loader\ConfigProcessor;
+use Consolidation\Config\Loader\YamlConfigLoader;
+
+class ConfigOverlayTest extends \PHPUnit_Framework_TestCase
+{
+    protected $overlay;
+
+    protected function setUp()
+    {
+        $aliasContext = new Config();
+        $aliasContext->import([
+            'hidden-by-a' => 'alias hidden-by-a',
+            'hidden-by-process' => 'alias hidden-by-process',
+            'options' =>[
+                'a-a' => 'alias-a',
+            ],
+            'command' => [
+                'foo' => [
+                    'bar' => [
+                        'command' => [
+                            'options' => [
+                                'a-b' => 'alias-b',
+                            ],
+                        ],
+                    ],
+                ],
+            ],
+        ]);
+
+        $configFileContext = new Config();
+        $configFileContext->import([
+            'hidden-by-cf' => 'config-file hidden-by-cf',
+            'hidden-by-a' => 'config-file hidden-by-a',
+            'hidden-by-process' => 'config-file hidden-by-process',
+            'options' =>[
+                'cf-a' => 'config-file-a',
+            ],
+            'command' => [
+                'foo' => [
+                    'bar' => [
+                        'command' => [
+                            'options' => [
+                                'cf-b' => 'config-file-b',
+                            ],
+                        ],
+                    ],
+                ],
+            ],
+        ]);
+
+        $this->overlay = new ConfigOverlay();
+        $this->overlay->set('hidden-by-process', 'process-h');
+        $this->overlay->addContext('cf', $configFileContext);
+        $this->overlay->addContext('a', $aliasContext);
+        $this->overlay->setDefault('df-a', 'default');
+        $this->overlay->setDefault('hidden-by-a', 'default hidden-by-a');
+        $this->overlay->setDefault('hidden-by-cf', 'default hidden-by-cf');
+        $this->overlay->setDefault('hidden-by-process', 'default hidden-by-process');
+    }
+
+    public function testGetPriority()
+    {
+        $this->assertEquals('process-h', $this->overlay->get('hidden-by-process'));
+        $this->assertEquals('config-file hidden-by-cf', $this->overlay->get('hidden-by-cf'));
+        $this->assertEquals('alias hidden-by-a', $this->overlay->get('hidden-by-a'));
+    }
+
+    public function testDefault()
+    {
+        $this->assertEquals('alias-a', $this->overlay->get('options.a-a'));
+        $this->assertEquals('alias-a', $this->overlay->get('options.a-a', 'ignored'));
+        $this->assertEquals('default', $this->overlay->getDefault('df-a', 'ignored'));
+        $this->assertEquals('nsv', $this->overlay->getDefault('a-a', 'nsv'));
+
+        $this->overlay->setDefault('df-a', 'new value');
+        $this->assertEquals('new value', $this->overlay->getDefault('df-a', 'ignored'));
+    }
+
+    public function testExport()
+    {
+        $data = $this->overlay->export();
+
+        $this->assertEquals('config-file-a', $data['options']['cf-a']);
+        $this->assertEquals('alias-a', $data['options']['a-a']);
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testImport()
+    {
+        $data = $this->overlay->import(['a' => 'value']);
+    }
+
+    public function testMaintainPriority()
+    {
+        // Get and re-add the 'cf' context. Its priority should not change.
+        $configFileContext = $this->overlay->getContext('cf');
+        $this->overlay->addContext('cf', $configFileContext);
+
+        // These asserts are the same as in testGetPriority
+        $this->assertEquals('process-h', $this->overlay->get('hidden-by-process'));
+        $this->assertEquals('config-file hidden-by-cf', $this->overlay->get('hidden-by-cf'));
+        $this->assertEquals('alias hidden-by-a', $this->overlay->get('hidden-by-a'));
+    }
+
+    public function testChangePriority()
+    {
+        // Increase the priority of the 'cf' context. Now, it should have a higher
+        // priority than the 'alias' context, but should still have a lower
+        // priority than the 'process' context.
+        $this->overlay->increasePriority('cf');
+
+        // These asserts are the same as in testGetPriority
+        $this->assertEquals('process-h', $this->overlay->get('hidden-by-process'));
+        $this->assertEquals('config-file hidden-by-cf', $this->overlay->get('hidden-by-cf'));
+
+        // This one has changed: the config-file value is now found instead
+        // of the alias value.
+        $this->assertEquals('config-file hidden-by-a', $this->overlay->get('hidden-by-a'));
+    }
+
+    public function testPlaceholder()
+    {
+        $this->overlay->addPlaceholder('lower');
+
+        $higherContext = new Config();
+        $higherContext->import(['priority-test' => 'higher']);
+
+        $lowerContext = new Config();
+        $lowerContext->import(['priority-test' => 'lower']);
+
+        // Usually 'lower' would have the highest priority, since it is
+        // added last. However, our earlier call to 'addPlaceholder' reserves
+        // a spot for it, so the 'higher' context will end up with a higher
+        // priority.
+        $this->overlay->addContext('higher', $higherContext);
+        $this->overlay->addContext('lower', $lowerContext);
+        $this->assertEquals('higher', $this->overlay->get('priority-test', 'neither'));
+
+        // Test to see that we can change the value of the 'higher' context,
+        // and the change will be reflected in the overlay.
+        $higherContext->set('priority-test', 'changed');
+        $this->assertEquals('changed', $this->overlay->get('priority-test', 'neither'));
+
+        // Test to see that the 'process' context still has the highest priority.
+        $this->overlay->set('priority-test', 'process');
+        $higherContext->set('priority-test', 'ignored');
+        $this->assertEquals('process', $this->overlay->get('priority-test', 'neither'));
+    }
+
+    public function testDoesNotHave()
+    {
+        $context = $this->overlay->getContext('no-such-context');
+        $data = $context->export();
+        $this->assertEquals('[]', json_encode($data));
+
+        $this->assertTrue(!$this->overlay->has('no-such-key'));
+        $this->assertTrue(!$this->overlay->hasDefault('no-such-default'));
+
+        $this->assertEquals('no-such-value', $this->overlay->get('no-such-key', 'no-such-value'));
+
+    }
+}