Added test coverage for PhpServiceMethodCompletionContributor

testData/completion/xml/PhpServiceMethodCompletionRegistrar/webApiXmlMustHaveCompletion/webapi.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Webapi:etc/webapi.xsd">
+
+    <!-- Product Service -->
+    <route url="/V1/products" method="POST">
+        <service class="Magento\Catalog\Api\ProductRepositoryInterface" method="<caret>"/>
+        <resources>
+            <resource ref="Magento_Catalog::products" />
+        </resources>
+    </route>
+
+</routes>

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

@@ -0,0 +1,19 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+package com.magento.idea.magento2plugin.completion.xml;
+
+public class PhpServiceMethodCompletionRegistrarTest extends CompletionXmlFixtureTestCase {
+
+    /**
+     * Tests for the completion in `method` attribute of the `service` tag in webapi.xml.
+     */
+    public void testWebApiXmlMustHaveCompletion() {
+        final String filePath = this.getFixturePath("webapi.xml");
+        myFixture.configureByFile(filePath);
+
+        assertCompletionContains(filePath, "save");
+    }
+}