diff --git a/pf4j/src/main/java/org/pf4j/AbstractPluginManager.java b/pf4j/src/main/java/org/pf4j/AbstractPluginManager.java
index 9562257..2374b56 100644
--- a/pf4j/src/main/java/org/pf4j/AbstractPluginManager.java
+++ b/pf4j/src/main/java/org/pf4j/AbstractPluginManager.java
@@ -860,10 +860,7 @@ public abstract class AbstractPluginManager implements PluginManager {
         ClassLoader pluginClassLoader = getPluginLoader().loadPlugin(pluginPath, pluginDescriptor);
         log.debug("Loaded plugin '{}' with class loader '{}'", pluginPath, pluginClassLoader);
 
-        // create the plugin wrapper
-        log.debug("Creating wrapper for plugin '{}'", pluginPath);
-        PluginWrapper pluginWrapper = new PluginWrapper(this, pluginDescriptor, pluginPath, pluginClassLoader);
-        pluginWrapper.setPluginFactory(getPluginFactory());
+        PluginWrapper pluginWrapper = createPluginWrapper(pluginDescriptor, pluginPath, pluginClassLoader);
 
         // test for disabled plugin
         if (isPluginDisabled(pluginDescriptor.getPluginId())) {
@@ -890,6 +887,19 @@ public abstract class AbstractPluginManager implements PluginManager {
 
         return pluginWrapper;
     }
+    
+    /**
+     * creates the plugin wrapper. override this if you want to prevent plugins having full access to the plugin manager
+     * 
+     * @return
+     */
+    protected PluginWrapper createPluginWrapper(PluginDescriptor pluginDescriptor, Path pluginPath, ClassLoader pluginClassLoader) {
+        // create the plugin wrapper
+        log.debug("Creating wrapper for plugin '{}'", pluginPath);
+        PluginWrapper pluginWrapper = new PluginWrapper(this, pluginDescriptor, pluginPath, pluginClassLoader);
+        pluginWrapper.setPluginFactory(getPluginFactory());
+        return pluginWrapper;
+    }
 
     /**
      * Tests for already loaded plugins on given path.
diff --git a/pf4j/src/main/java/org/pf4j/PluginClassLoader.java b/pf4j/src/main/java/org/pf4j/PluginClassLoader.java
index 4dbcb6a..d22dd55 100644
--- a/pf4j/src/main/java/org/pf4j/PluginClassLoader.java
+++ b/pf4j/src/main/java/org/pf4j/PluginClassLoader.java
@@ -103,7 +103,7 @@ public class PluginClassLoader extends URLClassLoader {
             }
 
             // if the class is part of the plugin engine use parent class loader
-            if (className.startsWith(PLUGIN_PACKAGE_PREFIX) && !className.startsWith("org.pf4j.demo")) {
+            if (className.startsWith(PLUGIN_PACKAGE_PREFIX) && !className.startsWith("org.pf4j.demo") && !className.startsWith("org.pf4j.test")) {
 //                log.trace("Delegate the loading of PF4J class '{}' to parent", className);
                 return getParent().loadClass(className);
             }
diff --git a/pf4j/src/main/java/org/pf4j/SecurePluginManagerWrapper.java b/pf4j/src/main/java/org/pf4j/SecurePluginManagerWrapper.java
new file mode 100644
index 0000000..f55b1e6
--- /dev/null
+++ b/pf4j/src/main/java/org/pf4j/SecurePluginManagerWrapper.java
@@ -0,0 +1,305 @@
+package org.pf4j;
+
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * Use this class to wrap the original plugin manager to prevent full access from within plugins.
+ * Override AbstractPluginManager.createPluginWrapper to use this class
+ * @author Wolfram Haussig
+ *
+ */
+public class SecurePluginManagerWrapper implements PluginManager {
+
+    private static final String PLUGIN_PREFIX = "Plugin ";
+    /**
+     * the current plugin
+     */
+    private String currentPluginId;
+    /**
+     * the original plugin manager
+     */
+    private PluginManager original;
+
+    /**
+     * The registered {@link PluginStateListener}s.
+     */
+    protected List<PluginStateListener> pluginStateListeners = new ArrayList<>();
+    /**
+     * wrapper for pluginStateListeners
+     */
+    private PluginStateListenerWrapper listenerWrapper = new PluginStateListenerWrapper();
+
+    /**
+     * constructor
+     * @param original the original plugin manager
+     * @param currentPlugin the current pluginId
+     */
+    public SecurePluginManagerWrapper(PluginManager original, String currentPluginId) {
+        this.original = original;
+        this.currentPluginId = currentPluginId;
+    }
+
+    @Override
+    public boolean isDevelopment() {
+        return original.isDevelopment();
+    }
+
+    @Override
+    public boolean isNotDevelopment() {
+        return original.isNotDevelopment();
+    }
+
+    @Override
+    public List<PluginWrapper> getPlugins() {
+        return Arrays.asList(getPlugin(currentPluginId));
+    }
+
+    @Override
+    public List<PluginWrapper> getPlugins(PluginState pluginState) {
+        return getPlugins().stream().filter(p -> p.getPluginState() == pluginState).collect(Collectors.toList());
+    }
+
+    @Override
+    public List<PluginWrapper> getResolvedPlugins() {
+        return getPlugins().stream().filter(p -> p.getPluginState().ordinal() >= PluginState.RESOLVED.ordinal()).collect(Collectors.toList());
+    }
+
+    @Override
+    public List<PluginWrapper> getUnresolvedPlugins() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public List<PluginWrapper> getStartedPlugins() {
+        return getPlugins(PluginState.STARTED);
+    }
+
+    @Override
+    public PluginWrapper getPlugin(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.getPlugin(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getPlugin for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public void loadPlugins() {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute loadPlugins!");
+    }
+
+    @Override
+    public String loadPlugin(Path pluginPath) {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute loadPlugin!");
+    }
+
+    @Override
+    public void startPlugins() {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute startPlugins!");
+    }
+
+    @Override
+    public PluginState startPlugin(String pluginId) {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute startPlugin!");
+    }
+
+    @Override
+    public void stopPlugins() {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute stopPlugins!");
+    }
+
+    @Override
+    public PluginState stopPlugin(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.stopPlugin(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute stopPlugin for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public void unloadPlugins() {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute unloadPlugins!");
+    }
+
+    @Override
+    public boolean unloadPlugin(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.unloadPlugin(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute unloadPlugin for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public boolean disablePlugin(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.disablePlugin(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute disablePlugin for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public boolean enablePlugin(String pluginId) {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute enablePlugin!");
+    }
+
+    @Override
+    public boolean deletePlugin(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.deletePlugin(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute deletePlugin for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public ClassLoader getPluginClassLoader(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.getPluginClassLoader(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getPluginClassLoader for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public List<Class<?>> getExtensionClasses(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.getExtensionClasses(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getExtensionClasses for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public <T> List<Class<? extends T>> getExtensionClasses(Class<T> type) {
+        return getExtensionClasses(type, currentPluginId);
+    }
+
+    @Override
+    public <T> List<Class<? extends T>> getExtensionClasses(Class<T> type, String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.getExtensionClasses(type, pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getExtensionClasses for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public <T> List<T> getExtensions(Class<T> type) {
+        return getExtensions(type, currentPluginId);
+    }
+
+    @Override
+    public <T> List<T> getExtensions(Class<T> type, String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.getExtensions(type, pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getExtensions for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public List<?> getExtensions(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.getExtensions(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getExtensions for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public Set<String> getExtensionClassNames(String pluginId) {
+        if (currentPluginId.equals(pluginId)) {
+            return original.getExtensionClassNames(pluginId);
+        } else {
+            throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getExtensionClassNames for foreign pluginId!");
+        }
+    }
+
+    @Override
+    public ExtensionFactory getExtensionFactory() {
+        return original.getExtensionFactory();
+    }
+
+    @Override
+    public RuntimeMode getRuntimeMode() {
+        return original.getRuntimeMode();
+    }
+
+    @Override
+    public PluginWrapper whichPlugin(Class<?> clazz) {
+        ClassLoader classLoader = clazz.getClassLoader();
+        PluginWrapper plugin = getPlugin(currentPluginId);
+        if (plugin.getPluginClassLoader() == classLoader) {
+            return plugin;
+        }
+        return null;
+    }
+
+    @Override
+    public void addPluginStateListener(PluginStateListener listener) {
+        if (pluginStateListeners.isEmpty()) {
+            this.original.addPluginStateListener(listenerWrapper);
+        }
+        pluginStateListeners.add(listener);
+    }
+
+    @Override
+    public void removePluginStateListener(PluginStateListener listener) {
+        pluginStateListeners.remove(listener);
+        if (pluginStateListeners.isEmpty()) {
+            this.original.removePluginStateListener(listenerWrapper);
+        }
+    }
+
+    @Override
+    public void setSystemVersion(String version) {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute setSystemVersion!");
+    }
+
+    @Override
+    public String getSystemVersion() {
+        return original.getSystemVersion();
+    }
+
+    @Override
+    public Path getPluginsRoot() {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getPluginsRoot!");
+    }
+
+    @Override
+    public List<Path> getPluginsRoots() {
+        throw new IllegalAccessError(PLUGIN_PREFIX + currentPluginId + " tried to execute getPluginsRoots!");
+    }
+
+    @Override
+    public VersionManager getVersionManager() {
+        return original.getVersionManager();
+    }
+
+    /**
+     * Wrapper for PluginStateListener events. will only propagate events if they match the current pluginId
+     * @author Wolfram Haussig
+     *
+     */
+    private class PluginStateListenerWrapper implements PluginStateListener {
+
+        @Override
+        public void pluginStateChanged(PluginStateEvent event) {
+            if (event.getPlugin().getPluginId().equals(currentPluginId)) {
+                for (PluginStateListener listener : pluginStateListeners) {
+                    listener.pluginStateChanged(event);
+                }
+            }
+        }
+
+    }
+}
diff --git a/pf4j/src/test/java/org/pf4j/SecurePluginManagerWrapperTest.java b/pf4j/src/test/java/org/pf4j/SecurePluginManagerWrapperTest.java
new file mode 100644
index 0000000..f42d83e
--- /dev/null
+++ b/pf4j/src/test/java/org/pf4j/SecurePluginManagerWrapperTest.java
@@ -0,0 +1,272 @@
+package org.pf4j;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.List;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.pf4j.test.PluginJar;
+import org.pf4j.test.TestExtension;
+import org.pf4j.test.TestExtensionPoint;
+import org.pf4j.test.TestPlugin;
+
+public class SecurePluginManagerWrapperTest {
+
+    private static final String OTHER_PLUGIN_ID = "test-plugin-2";
+    private static final String THIS_PLUGIN_ID = "test-plugin-1";
+    private PluginJar thisPlugin;
+    private PluginJar otherPlugin;
+    private PluginManager pluginManager;
+    private PluginManager wrappedPluginManager;
+    private int pluginManagerEvents = 0;
+    private int wrappedPluginManagerEvents = 0;
+
+    @TempDir
+    Path pluginsPath;
+
+    @BeforeEach
+    public void setUp() throws IOException {
+        pluginManagerEvents = 0;
+        wrappedPluginManagerEvents = 0;
+        thisPlugin = new PluginJar.Builder(pluginsPath.resolve("test-plugin1.jar"), THIS_PLUGIN_ID).pluginClass(TestPlugin.class.getName()).pluginVersion("1.2.3").extension(TestExtension.class.getName()).build();
+        otherPlugin = new PluginJar.Builder(pluginsPath.resolve("test-plugin2.jar"), OTHER_PLUGIN_ID).pluginClass(TestPlugin.class.getName()).pluginVersion("1.2.3").extension(TestExtension.class.getName()).build();
+
+        pluginManager = new JarPluginManager(pluginsPath);
+        wrappedPluginManager = new SecurePluginManagerWrapper(pluginManager, THIS_PLUGIN_ID);
+    }
+
+    @AfterEach
+    public void tearDown() {
+        pluginManager.unloadPlugins();
+
+        thisPlugin = null;
+        otherPlugin = null;
+        pluginManager = null;
+    }
+
+    @Test
+    public void pluginStateListeners() {
+        pluginManager.addPluginStateListener(new PluginStateListener() {
+            @Override
+            public void pluginStateChanged(PluginStateEvent event) {
+                pluginManagerEvents++;
+            }
+        });
+        wrappedPluginManager.addPluginStateListener(new PluginStateListener() {
+            @Override
+            public void pluginStateChanged(PluginStateEvent event) {
+                wrappedPluginManagerEvents++;
+            }
+        });
+        pluginManager.loadPlugins();
+        pluginManager.startPlugins();
+        assertEquals(4, pluginManagerEvents);
+        assertEquals(2, wrappedPluginManagerEvents);
+    }
+
+    @Test
+    public void deletePlugin() {
+        pluginManager.loadPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.deletePlugin(OTHER_PLUGIN_ID));
+        assertTrue(wrappedPluginManager.deletePlugin(THIS_PLUGIN_ID));
+    }
+
+    @Test
+    public void disablePlugin() {
+        pluginManager.loadPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.disablePlugin(OTHER_PLUGIN_ID));
+        assertTrue(wrappedPluginManager.disablePlugin(THIS_PLUGIN_ID));
+    }
+
+    @Test
+    public void enablePlugin() {
+        pluginManager.loadPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.enablePlugin(OTHER_PLUGIN_ID));
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.enablePlugin(THIS_PLUGIN_ID));
+    }
+
+    @Test
+    public void getExtensionClasses() {
+        pluginManager.loadPlugins();
+        pluginManager.startPlugins();
+        assertEquals(1, wrappedPluginManager.getExtensionClasses(TestExtensionPoint.class).size());
+
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getExtensionClasses(TestExtensionPoint.class, OTHER_PLUGIN_ID));
+        assertEquals(1, wrappedPluginManager.getExtensionClasses(TestExtensionPoint.class, THIS_PLUGIN_ID).size());
+
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getExtensionClasses(OTHER_PLUGIN_ID));
+        assertEquals(1, wrappedPluginManager.getExtensionClasses(THIS_PLUGIN_ID).size());
+    }
+
+    @Test
+    public void getExtensionClassNames() {
+        pluginManager.loadPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getExtensionClassNames(OTHER_PLUGIN_ID));
+        assertEquals(1, wrappedPluginManager.getExtensionClassNames(THIS_PLUGIN_ID).size());
+    }
+
+    @Test
+    public void getExtensionFactory() {
+        pluginManager.loadPlugins();
+        assertEquals(pluginManager.getExtensionFactory(), wrappedPluginManager.getExtensionFactory());
+    }
+
+    @Test
+    public void getExtensions() {
+        pluginManager.loadPlugins();
+        pluginManager.startPlugins();
+        assertEquals(1, wrappedPluginManager.getExtensions(TestExtensionPoint.class).size());
+
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getExtensions(TestExtensionPoint.class, OTHER_PLUGIN_ID));
+        assertEquals(1, wrappedPluginManager.getExtensions(TestExtensionPoint.class, THIS_PLUGIN_ID).size());
+
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getExtensions(OTHER_PLUGIN_ID));
+        assertEquals(1, wrappedPluginManager.getExtensions(THIS_PLUGIN_ID).size());
+    }
+
+    @Test
+    public void getPlugin() {
+        pluginManager.loadPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getPlugin(OTHER_PLUGIN_ID));
+        assertEquals(THIS_PLUGIN_ID, wrappedPluginManager.getPlugin(THIS_PLUGIN_ID).getPluginId());
+    }
+
+    @Test
+    public void getPluginClassLoader() {
+        pluginManager.loadPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getPluginClassLoader(OTHER_PLUGIN_ID));
+        assertNotNull(wrappedPluginManager.getPluginClassLoader(THIS_PLUGIN_ID));
+    }
+
+    @Test
+    public void getPlugins() {
+        pluginManager.loadPlugins();
+        assertEquals(2, pluginManager.getPlugins().size());
+        assertEquals(1, wrappedPluginManager.getPlugins().size());
+    }
+
+    @Test
+    public void getPluginsRoot() {
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getPluginsRoot());
+    }
+
+    @Test
+    public void getPluginsRoots() {
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.getPluginsRoots());
+    }
+
+    @Test
+    public void getResolvedPlugins() {
+        pluginManager.loadPlugins();
+        assertEquals(2, pluginManager.getResolvedPlugins().size());
+        assertEquals(1, wrappedPluginManager.getResolvedPlugins().size());
+    }
+
+    @Test
+    public void getRuntimeMode() {
+        assertEquals(pluginManager.getRuntimeMode(), wrappedPluginManager.getRuntimeMode());
+    }
+
+    @Test
+    public void getStartedPlugins() {
+        pluginManager.loadPlugins();
+        pluginManager.startPlugins();
+        assertEquals(2, pluginManager.getStartedPlugins().size());
+        assertEquals(1, wrappedPluginManager.getStartedPlugins().size());
+    }
+
+    @Test
+    public void getSystemVersion() {
+        assertEquals(pluginManager.getSystemVersion(), wrappedPluginManager.getSystemVersion());
+    }
+
+    @Test
+    public void getUnresolvedPlugins() {
+        assertNotNull(wrappedPluginManager);
+        assertNotNull(wrappedPluginManager.getUnresolvedPlugins());
+        assertTrue(wrappedPluginManager.getUnresolvedPlugins().isEmpty());
+    }
+
+    @Test
+    public void getVersionManager() {
+        assertEquals(pluginManager.getVersionManager(), wrappedPluginManager.getVersionManager());
+    }
+
+    @Test
+    public void isDevelopment() {
+        assertEquals(pluginManager.isDevelopment(), wrappedPluginManager.isDevelopment());
+    }
+
+    @Test
+    public void isNotDevelopment() {
+        assertEquals(pluginManager.isNotDevelopment(), wrappedPluginManager.isNotDevelopment());
+    }
+
+    @Test
+    public void loadPlugin() {
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.loadPlugin(thisPlugin.path()));
+    }
+
+    @Test
+    public void loadPlugins() {
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.loadPlugins());
+    }
+
+    @Test
+    public void setSystemVersion() {
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.setSystemVersion("1.0.0"));
+    }
+
+    @Test
+    public void startPlugin() {
+        pluginManager.loadPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.startPlugin(OTHER_PLUGIN_ID));
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.startPlugin(THIS_PLUGIN_ID));
+    }
+
+    @Test
+    public void startPlugins() {
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.startPlugins());
+    }
+
+    @Test
+    public void stopPlugin() {
+        pluginManager.loadPlugins();
+        pluginManager.startPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.stopPlugin(OTHER_PLUGIN_ID));
+        assertEquals(PluginState.STOPPED, wrappedPluginManager.stopPlugin(THIS_PLUGIN_ID));
+    }
+
+    @Test
+    public void stopPlugins() {
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.stopPlugins());
+    }
+
+    @Test
+    public void unloadPlugin() {
+        pluginManager.loadPlugins();
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.unloadPlugin(OTHER_PLUGIN_ID));
+        assertTrue(wrappedPluginManager.unloadPlugin(THIS_PLUGIN_ID));
+    }
+
+    @Test
+    public void unloadPlugins() {
+        assertThrows(IllegalAccessError.class, () -> wrappedPluginManager.unloadPlugins());
+    }
+
+    @Test
+    public void whichPlugin() {
+        pluginManager.loadPlugins();
+        pluginManager.startPlugins();
+        assertEquals(null, wrappedPluginManager.whichPlugin(pluginManager.getExtensionClasses(OTHER_PLUGIN_ID).get(0)));
+        assertEquals(THIS_PLUGIN_ID, wrappedPluginManager.whichPlugin(pluginManager.getExtensionClasses(THIS_PLUGIN_ID).get(0)).getPluginId());
+    }
+}