diff --git a/pf4j/src/test/java/org/pf4j/AbstractPluginManagerTest.java b/pf4j/src/test/java/org/pf4j/AbstractPluginManagerTest.java
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+++ b/pf4j/src/test/java/org/pf4j/AbstractPluginManagerTest.java
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+/*
+ * Copyright (C) 2012-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.pf4j;
+
+import org.junit.jupiter.api.Test;
+import org.pf4j.plugin.TestExtension;
+import org.pf4j.plugin.TestExtensionPoint;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.CALLS_REAL_METHODS;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * @author Decebal Suiu
+ */
+public class AbstractPluginManagerTest {
+
+    @Test
+    public void getExtensionsByType() {
+        AbstractPluginManager pluginManager = mock(AbstractPluginManager.class, CALLS_REAL_METHODS);
+
+        ExtensionFinder extensionFinder = mock(ExtensionFinder.class);
+        List<ExtensionWrapper<TestExtensionPoint>> extensionList = new ArrayList<>(1);
+        extensionList.add(new ExtensionWrapper<>(new ExtensionDescriptor(0, TestExtension.class), new DefaultExtensionFactory()));
+        when(extensionFinder.find(TestExtensionPoint.class)).thenReturn(extensionList);
+
+        pluginManager.extensionFinder = extensionFinder;
+        List<TestExtensionPoint> extensions = pluginManager.getExtensions(TestExtensionPoint.class);
+        assertEquals(1, extensions.size());
+    }
+
+}