Added test coverage for PhpConstructorArgumentCompletionProvider

Author: drpayyne

testData/completion/xml/ConstructorArgumentCompletionRegistrar/diXmlMustHaveCompletion/di.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<!--
+ /**
+  * Copyright © Magento, Inc. All rights reserved.
+  * See COPYING.txt for license details.
+  */
+-->
+<config>
+    <type name="Magento\Backend\Model\Source\YesNo">
+        <arguments>
+            <argument name="<caret>" xsi:type="object">Foo\Bar\Model\Logger</argument>
+        </arguments>
+    </type>
+</config>

tests/com/magento/idea/magento2plugin/completion/xml/ConstructorArgumentCompletionRegistrarTest.java

@@ -0,0 +1,21 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+package com.magento.idea.magento2plugin.completion.xml;
+
+import com.magento.idea.magento2plugin.magento.files.ModuleDiXml;
+
+public class ConstructorArgumentCompletionRegistrarTest extends CompletionXmlFixtureTestCase {
+
+    /**
+     * Tests for completion of constructor argument in di.xml.
+     */
+    public void testDiXmlMustHaveCompletion() {
+        String filePath = this.getFixturePath(ModuleDiXml.FILE_NAME);
+        myFixture.copyFileToProject(filePath);
+
+        assertFileContainsCompletions(filePath, "logger");
+    }
+}