Covered ObserverDeclarationInspection with tests

Author: drpayyne

testData/inspections/xml/ObserverDeclarationInspection/observerNameUsedInDifferentFile/events.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<config>
+    <event name="test_event_in_test_class">
+        <observer name="test_observer" instance="Magento\Catalog\Observer\TestObserver" />
+    </event>
+</config>

testData/inspections/xml/ObserverDeclarationInspection/observerNameUsedInSameFile/events.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<config>
+    <event name="some_random_event">
+        <observer name="observer_one" instance="Vendor\Module\Observer\Class" />
+        <observer name="observer_two" instance="Vendor\Module\Observer\Class" />
+    </event>
+</config>

tests/com/magento/idea/magento2plugin/inspections/xml/ObserverDeclarationInspectionTest.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+package com.magento.idea.magento2plugin.inspections.xml;
+
+import com.magento.idea.magento2plugin.magento.files.ModuleEventsXml;
+
+public class ObserverDeclarationInspectionTest extends InspectionXmlFixtureTestCase {
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        myFixture.enableInspections(ObserverDeclarationInspection.class);
+    }
+
+    /**
+     * Tests for duplicate observer name inspection warning in the same events.xml
+     */
+    public void testObserverNameUsedInSameFile() {
+        myFixture.configureByFile(getFixturePath(ModuleEventsXml.FILE_NAME));
+        myFixture.testHighlighting(true, false, false);
+    }
+
+    /**
+     * Tests for duplicate observer name inspection warning in a different events.xml
+     */
+    public void testObserverNameUsedInDifferentFile() {
+        myFixture.configureByFile(getFixturePath(ModuleEventsXml.FILE_NAME));
+        myFixture.testHighlighting(true, false, false);
+    }
+}