src/test/java/org/apache/commons/configuration2/TestConfigurationUtils.java - commons-configuration - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You 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.apache.commons.configuration2;

 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNotSame;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertSame;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.Mockito.mock;

 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;

 import org.apache.commons.configuration2.builder.XMLBuilderParametersImpl;
 import org.apache.commons.configuration2.convert.DefaultListDelimiterHandler;
 import org.apache.commons.configuration2.event.ConfigurationErrorEvent;
 import org.apache.commons.configuration2.event.ConfigurationEvent;
 import org.apache.commons.configuration2.event.EventListener;
 import org.apache.commons.configuration2.event.EventSource;
 import org.apache.commons.configuration2.ex.ConfigurationRuntimeException;
 import org.apache.commons.configuration2.sync.NoOpSynchronizer;
 import org.apache.commons.configuration2.tree.DefaultExpressionEngine;
 import org.apache.commons.configuration2.tree.DefaultExpressionEngineSymbols;
 import org.apache.commons.configuration2.tree.ExpressionEngine;
 import org.apache.commons.configuration2.tree.ImmutableNode;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;

 /**
  * Tests the ConfigurationUtils class
  */
 public class TestConfigurationUtils {
     /**
      * A test Synchronizer implementation which can be cloned.
      */
     private static final class CloneableSynchronizer extends NonCloneableSynchronizer implements Cloneable {
         /** A flag whether clone() was called. */
         private final boolean cloned;

         /**
          * Creates a new instance of {@code CloneableSynchronizer} and sets the clone flag.
          *
          * @param clone the clone flag
          */
         public CloneableSynchronizer(final boolean clone) {
             cloned = clone;
         }

         @Override
         public Object clone() {
             return new CloneableSynchronizer(true);
         }

         /**
          * Returns a flag whether this object was cloned.
          *
          * @return the clone flag
          */
         public boolean isCloned() {
             return cloned;
         }
     }

     /**
      * A test Synchronizer implementation which cannot be cloned.
      */
     private static class NonCloneableSynchronizer extends SynchronizerTestImpl {
     }

     /** Constant for the name of a class to be loaded. */
     private static final String CLS_NAME = "org.apache.commons.configuration2.PropertiesConfiguration";

     /** Stores the CCL. */
     private ClassLoader ccl;

     @BeforeEach
     public void setUp() throws Exception {
         ccl = Thread.currentThread().getContextClassLoader();
     }

     @AfterEach
     public void tearDown() throws Exception {
         Thread.currentThread().setContextClassLoader(ccl);
     }

     @Test
     public void testAppend() {
         // create the source configuration
         final Configuration conf1 = new BaseConfiguration();
         conf1.addProperty("key1", "value1");
         conf1.addProperty("key2", "value2");

         // create the target configuration
         final Configuration conf2 = new BaseConfiguration();
         conf2.addProperty("key1", "value3");
         conf2.addProperty("key2", "value4");

         // append the source configuration to the target configuration
         ConfigurationUtils.append(conf1, conf2);

         List<Object> expected = new ArrayList<>();
         expected.add("value3");
         expected.add("value1");
         assertEquals(expected, conf2.getList("key1"));

         expected = new ArrayList<>();
         expected.add("value4");
         expected.add("value2");
         assertEquals(expected, conf2.getList("key2"));
     }

     /**
      * Tests asEventSource() if an exception is expected.
      */
     @Test
     public void testAsEventSourceNonSupportedEx() {
         assertThrows(ConfigurationRuntimeException.class, () -> ConfigurationUtils.asEventSource(this, false));
     }

     /**
      * Tests asEventSource() if the passed in object implements this interface.
      */
     @Test
     public void testAsEventSourceSupported() {
         final XMLConfiguration src = new XMLConfiguration();
         assertSame(src, ConfigurationUtils.asEventSource(src, true));
     }

     /**
      * Tests asEventSource() if a mock object has to be returned.
      */
     @Test
     public void testAsEventSourceUnsupportedMock() {
         @SuppressWarnings("unchecked")
         final EventListener<ConfigurationEvent> cl = mock(EventListener.class);
         final EventSource source = ConfigurationUtils.asEventSource(this, true);
         source.addEventListener(ConfigurationEvent.ANY, cl);
         assertFalse(source.removeEventListener(ConfigurationEvent.ANY, cl));
         source.addEventListener(ConfigurationEvent.ANY, null);
     }

     /**
      * Tests cloning a configuration that supports this operation.
      */
     @Test
     public void testCloneConfiguration() {
         final BaseHierarchicalConfiguration conf = new BaseHierarchicalConfiguration();
         conf.addProperty("test", "yes");
         final BaseHierarchicalConfiguration copy = (BaseHierarchicalConfiguration) ConfigurationUtils.cloneConfiguration(conf);
         assertNotSame(conf, copy);
         assertEquals("yes", copy.getString("test"));
     }

     /**
      * Tests cloning a configuration that does not support this operation. This should cause an exception.
      */
     @Test
     public void testCloneConfigurationNotSupported() {
         final Configuration myNonCloneableConfig = new NonCloneableConfiguration();
         assertThrows(ConfigurationRuntimeException.class, () -> ConfigurationUtils.cloneConfiguration(myNonCloneableConfig));
     }

     /**
      * Tests cloning a <b>null</b> configuration.
      */
     @Test
     public void testCloneConfigurationNull() {
         assertNull(ConfigurationUtils.cloneConfiguration(null));
     }

     /**
      * Tests whether errors are handled correctly by cloneIfPossible().
      */
     @Test
     public void testCloneIfPossibleError() {
         final XMLBuilderParametersImpl params = new XMLBuilderParametersImpl() {
             @Override
             public XMLBuilderParametersImpl clone() {
                 throw new ConfigurationRuntimeException();
             }
         };
         assertSame(params, ConfigurationUtils.cloneIfPossible(params));
     }

     /**
      * Tests cloneIfPossible() if the passed in object does not support cloning.
      */
     @Test
     public void testCloneIfPossibleNotSupported() {
         final Long value = 20130116221714L;
         assertSame(value, ConfigurationUtils.cloneIfPossible(value));
     }

     /**
      * Tests whether cloneIfPossible() can handle null parameters.
      */
     @Test
     public void testCloneIfPossibleNull() {
         assertNull(ConfigurationUtils.cloneIfPossible(null));
     }

     /**
      * Tests whether an object can be cloned which supports cloning.
      */
     @Test
     public void testCloneIfPossibleSupported() {
         final XMLBuilderParametersImpl params = new XMLBuilderParametersImpl();
         params.setPublicID("testID");
         params.setSchemaValidation(true);
         final XMLBuilderParametersImpl clone = (XMLBuilderParametersImpl) ConfigurationUtils.cloneIfPossible(params);
         assertNotSame(params, clone);
         final Map<String, Object> map = clone.getParameters();
         for (final Map.Entry<String, Object> e : params.getParameters().entrySet()) {
             if (!e.getKey().startsWith("config-")) {
                 assertEquals(e.getValue(), map.get(e.getKey()), "Wrong value for field " + e.getKey());
             }
         }
     }

     /**
      * Tests whether a Synchronizer can be cloned using its clone() method.
      */
     @Test
     public void testCloneSynchronizerClone() {
         final CloneableSynchronizer sync = new CloneableSynchronizer(false);
         final CloneableSynchronizer sync2 = (CloneableSynchronizer) ConfigurationUtils.cloneSynchronizer(sync);
         assertTrue(sync2.isCloned());
     }

     /**
      * Tests cloneSynchronizer() if the argument cannot be cloned.
      */
     @Test
     public void testCloneSynchronizerFailed() {
         final NonCloneableSynchronizer synchronizer = new NonCloneableSynchronizer();
         assertThrows(ConfigurationRuntimeException.class, () -> ConfigurationUtils.cloneSynchronizer(synchronizer));
     }

     /**
      * Tests whether a new Synchronizer can be created using reflection.
      */
     @Test
     public void testCloneSynchronizerNewInstance() {
         final SynchronizerTestImpl sync = new SynchronizerTestImpl();
         final SynchronizerTestImpl sync2 = (SynchronizerTestImpl) ConfigurationUtils.cloneSynchronizer(sync);
         assertNotNull(sync2);
         assertNotSame(sync, sync2);
     }

     /**
      * Tests whether the NoOpSyhnchronizer can be cloned.
      */
     @Test
     public void testCloneSynchronizerNoOp() {
         assertSame(NoOpSynchronizer.INSTANCE, ConfigurationUtils.cloneSynchronizer(NoOpSynchronizer.INSTANCE));
     }

     /**
      * Tries to clone a null Synchronizer.
      */
     @Test
     public void testCloneSynchronizerNull() {
         assertThrows(IllegalArgumentException.class, () -> ConfigurationUtils.cloneSynchronizer(null));
     }

     /**
      * Tests converting a configuration into a hierarchical one that is already hierarchical.
      */
     @Test
     public void testConvertHierarchicalToHierarchical() {
         final Configuration conf = new BaseHierarchicalConfiguration();
         conf.addProperty("test", "yes");
         assertSame(conf, ConfigurationUtils.convertToHierarchical(conf));
     }

     /**
      * Tests converting an already hierarchical configuration using an expression engine. The new engine should be set.
      */
     @Test
     public void testConvertHierarchicalToHierarchicalEngine() {
         final BaseHierarchicalConfiguration hc = new BaseHierarchicalConfiguration();
         final ExpressionEngine engine = new DefaultExpressionEngine(DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS);
         assertSame(hc, ConfigurationUtils.convertToHierarchical(hc, engine));
         assertSame(engine, hc.getExpressionEngine());
     }

     /**
      * Tests converting an already hierarchical configuration using a null expression engine. In this case the expression
      * engine of the configuration should not be touched.
      */
     @Test
     public void testConvertHierarchicalToHierarchicalNullEngine() {
         final BaseHierarchicalConfiguration hc = new BaseHierarchicalConfiguration();
         final ExpressionEngine engine = new DefaultExpressionEngine(DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS);
         hc.setExpressionEngine(engine);
         assertSame(hc, ConfigurationUtils.convertToHierarchical(hc, null));
         assertSame(engine, hc.getExpressionEngine());
     }

     /**
      * Tests converting a null configuration to a hierarchical one. The result should be null, too.
      */
     @Test
     public void testConvertNullToHierarchical() {
         assertNull(ConfigurationUtils.convertToHierarchical(null));
     }

     /**
      * Tests converting a configuration into a hierarchical one.
      */
     @Test
     public void testConvertToHierarchical() {
         final Configuration conf = new BaseConfiguration();
         for (int i = 0; i < 10; i++) {
             conf.addProperty("test" + i, "value" + i);
             conf.addProperty("test.list", "item" + i);
         }

         final BaseHierarchicalConfiguration hc = (BaseHierarchicalConfiguration) ConfigurationUtils.convertToHierarchical(conf);
         for (final Iterator<String> it = conf.getKeys(); it.hasNext();) {
             final String key = it.next();
             assertEquals(conf.getProperty(key), hc.getProperty(key), "Wrong value for key " + key);
         }
     }

     /**
      * Tests converting a configuration into a hierarchical one if some of its properties contain escaped list delimiter
      * characters.
      */
     @Test
     public void testConvertToHierarchicalDelimiters() {
         final BaseConfiguration conf = new BaseConfiguration();
         conf.setListDelimiterHandler(new DefaultListDelimiterHandler(','));
         conf.addProperty("test.key", "1\\,2\\,3");
         assertEquals("1,2,3", conf.getString("test.key"));
         final HierarchicalConfiguration<?> hc = ConfigurationUtils.convertToHierarchical(conf);
         assertEquals("1,2,3", hc.getString("test.key"));
     }

     /**
      * Tests converting a configuration to a hierarchical one using a specific expression engine.
      */
     @Test
     public void testConvertToHierarchicalEngine() {
         final Configuration conf = new BaseConfiguration();
         conf.addProperty("test(a)", Boolean.TRUE);
         conf.addProperty("test(b)", Boolean.FALSE);
         final DefaultExpressionEngine engine = new DefaultExpressionEngine(
             new DefaultExpressionEngineSymbols.Builder(DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS).setIndexStart("[").setIndexEnd("]").create());
         final HierarchicalConfiguration<?> hc = ConfigurationUtils.convertToHierarchical(conf, engine);
         assertTrue(hc.getBoolean("test(a)"));
         assertFalse(hc.getBoolean("test(b)"));
     }

     /**
      * Tests converting a configuration to a hierarchical one that contains a property with multiple values. This test is
      * related to CONFIGURATION-346.
      */
     @Test
     public void testConvertToHierarchicalMultiValues() {
         final BaseConfiguration config = new BaseConfiguration();
         config.setListDelimiterHandler(new DefaultListDelimiterHandler(','));
         config.addProperty("test", "1,2,3");
         final HierarchicalConfiguration<?> hc = ConfigurationUtils.convertToHierarchical(config);
         assertEquals(1, hc.getInt("test(0)"));
         assertEquals(2, hc.getInt("test(1)"));
         assertEquals(3, hc.getInt("test(2)"));
     }

     /**
      * Tests that the structure of the resulting hierarchical configuration does not depend on the order of properties in
      * the source configuration. This test is related to CONFIGURATION-604.
      */
     @Test
     public void testConvertToHierarchicalOrderOfProperties() {
         final PropertiesConfiguration config = new PropertiesConfiguration();
         config.addProperty("x.y.z", true);
         config.addProperty("x.y", true);
         @SuppressWarnings("unchecked")
         final HierarchicalConfiguration<ImmutableNode> hc = (HierarchicalConfiguration<ImmutableNode>) ConfigurationUtils.convertToHierarchical(config);
         final ImmutableNode rootNode = hc.getNodeModel().getNodeHandler().getRootNode();
         final ImmutableNode nodeX = rootNode.getChildren().get(0);
         assertEquals(1, nodeX.getChildren().size());
     }

     @Test
     public void testCopy() {
         // create the source configuration
         final Configuration conf1 = new BaseConfiguration();
         conf1.addProperty("key1", "value1");
         conf1.addProperty("key2", "value2");

         // create the target configuration
         final Configuration conf2 = new BaseConfiguration();
         conf2.addProperty("key1", "value3");
         conf2.addProperty("key2", "value4");

         // copy the source configuration into the target configuration
         ConfigurationUtils.copy(conf1, conf2);

         assertEquals("value1", conf2.getProperty("key1"));
         assertEquals("value2", conf2.getProperty("key2"));
     }

     /**
      * Tests whether runtime exceptions can be enabled.
      */
     @Test
     public void testEnableRuntimeExceptions() {
         final PropertiesConfiguration config = new PropertiesConfiguration() {
             @Override
             protected void addPropertyDirect(final String key, final Object value) {
                 // always simulate an exception
                 fireError(ConfigurationErrorEvent.WRITE, ConfigurationEvent.ADD_PROPERTY, key, value, new RuntimeException("A faked exception!"));
             }
         };
         config.clearErrorListeners();
         ConfigurationUtils.enableRuntimeExceptions(config);
         assertThrows(ConfigurationRuntimeException.class, () -> config.addProperty("test", "testValue"));
     }

     /**
      * Tries to enable runtime exceptions for a configuration that does not inherit from EventSource. This should cause an
      * exception.
      */
     @Test
     public void testEnableRuntimeExceptionsInvalid() {
         final Configuration c = mock(Configuration.class);
         assertThrows(IllegalArgumentException.class, () -> ConfigurationUtils.enableRuntimeExceptions(c));
     }

     /**
      * Tries to enable runtime exceptions for a null configuration. This should cause an exception.
      */
     @Test
     public void testEnableRuntimeExceptionsNull() {
         assertThrows(IllegalArgumentException.class, () -> ConfigurationUtils.enableRuntimeExceptions(null));
     }

     /**
      * Tests whether a class can be loaded if it is not found by the CCL.
      */
     @Test
     public void testLoadClassCCLNotFound() throws ClassNotFoundException {
         Thread.currentThread().setContextClassLoader(new ClassLoader() {
             @Override
             public Class<?> loadClass(final String name) throws ClassNotFoundException {
                 throw new ClassNotFoundException(name);
             }
         });
         assertEquals(CLS_NAME, ConfigurationUtils.loadClass(CLS_NAME).getName());
     }

     /**
      * Tests whether a class can be loaded if there is no CCL.
      */
     @Test
     public void testLoadClassCCLNull() throws ClassNotFoundException {
         Thread.currentThread().setContextClassLoader(null);
         assertEquals(CLS_NAME, ConfigurationUtils.loadClass(CLS_NAME).getName());
     }

     /**
      * Tests whether a class can be loaded from CCL.
      */
     @Test
     public void testLoadClassFromCCL() throws ClassNotFoundException {
         Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
         assertEquals(CLS_NAME, ConfigurationUtils.loadClass(CLS_NAME).getName());
     }

     /**
      * Tests loadClassNoEx() if the class can be resolved.
      */
     @Test
     public void testLoadClassNoExFound() {
         assertEquals(CLS_NAME, ConfigurationUtils.loadClassNoEx(CLS_NAME).getName());
     }

     /**
      * Tests loadClassNoEx() if the class cannot be resolved.
      */
     @Test
     public void testLoadClassNoExNotFound() {
         assertThrows(ConfigurationRuntimeException.class, () -> ConfigurationUtils.loadClassNoEx("a non existing class!"));
     }

     /**
      * Tests the behavior of loadClass() for a non-existing class.
      */
     @Test
     public void testLoadClassNotFound() {
         assertThrows(ClassNotFoundException.class, () -> ConfigurationUtils.loadClass("a non existing class!"));
     }

     @Test
     public void testToString() {
         final Configuration config = new BaseConfiguration();
         final String lineSeparator = System.lineSeparator();

         assertEquals("", ConfigurationUtils.toString(config));

         config.setProperty("one", "1");
         assertEquals("one=1", ConfigurationUtils.toString(config));

         config.setProperty("two", "2");
         assertEquals("one=1" + lineSeparator + "two=2", ConfigurationUtils.toString(config));

         config.clearProperty("one");
         assertEquals("two=2", ConfigurationUtils.toString(config));

         config.setProperty("one", "1");
         assertEquals("two=2" + lineSeparator + "one=1", ConfigurationUtils.toString(config));
     }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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.apache.commons.configuration2;

	import static org.junit.jupiter.api.Assertions.assertEquals;
	import static org.junit.jupiter.api.Assertions.assertFalse;
	import static org.junit.jupiter.api.Assertions.assertNotNull;
	import static org.junit.jupiter.api.Assertions.assertNotSame;
	import static org.junit.jupiter.api.Assertions.assertNull;
	import static org.junit.jupiter.api.Assertions.assertSame;
	import static org.junit.jupiter.api.Assertions.assertThrows;
	import static org.junit.jupiter.api.Assertions.assertTrue;
	import static org.mockito.Mockito.mock;

	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;

	import org.apache.commons.configuration2.builder.XMLBuilderParametersImpl;
	import org.apache.commons.configuration2.convert.DefaultListDelimiterHandler;
	import org.apache.commons.configuration2.event.ConfigurationErrorEvent;
	import org.apache.commons.configuration2.event.ConfigurationEvent;
	import org.apache.commons.configuration2.event.EventListener;
	import org.apache.commons.configuration2.event.EventSource;
	import org.apache.commons.configuration2.ex.ConfigurationRuntimeException;
	import org.apache.commons.configuration2.sync.NoOpSynchronizer;
	import org.apache.commons.configuration2.tree.DefaultExpressionEngine;
	import org.apache.commons.configuration2.tree.DefaultExpressionEngineSymbols;
	import org.apache.commons.configuration2.tree.ExpressionEngine;
	import org.apache.commons.configuration2.tree.ImmutableNode;
	import org.junit.jupiter.api.AfterEach;
	import org.junit.jupiter.api.BeforeEach;
	import org.junit.jupiter.api.Test;

	/**
	* Tests the ConfigurationUtils class
	*/
	public class TestConfigurationUtils {
	/**
	* A test Synchronizer implementation which can be cloned.
	*/
	private static final class CloneableSynchronizer extends NonCloneableSynchronizer implements Cloneable {
	/** A flag whether clone() was called. */
	private final boolean cloned;

	/**
	* Creates a new instance of {@code CloneableSynchronizer} and sets the clone flag.
	*
	* @param clone the clone flag
	*/
	public CloneableSynchronizer(final boolean clone) {
	cloned = clone;
	}

	@Override
	public Object clone() {
	return new CloneableSynchronizer(true);
	}

	/**
	* Returns a flag whether this object was cloned.
	*
	* @return the clone flag
	*/
	public boolean isCloned() {
	return cloned;
	}
	}

	/**
	* A test Synchronizer implementation which cannot be cloned.
	*/
	private static class NonCloneableSynchronizer extends SynchronizerTestImpl {
	}

	/** Constant for the name of a class to be loaded. */
	private static final String CLS_NAME = "org.apache.commons.configuration2.PropertiesConfiguration";

	/** Stores the CCL. */
	private ClassLoader ccl;

	@BeforeEach
	public void setUp() throws Exception {
	ccl = Thread.currentThread().getContextClassLoader();
	}

	@AfterEach
	public void tearDown() throws Exception {
	Thread.currentThread().setContextClassLoader(ccl);
	}

	@Test
	public void testAppend() {
	// create the source configuration
	final Configuration conf1 = new BaseConfiguration();
	conf1.addProperty("key1", "value1");
	conf1.addProperty("key2", "value2");

	// create the target configuration
	final Configuration conf2 = new BaseConfiguration();
	conf2.addProperty("key1", "value3");
	conf2.addProperty("key2", "value4");

	// append the source configuration to the target configuration
	ConfigurationUtils.append(conf1, conf2);

	List<Object> expected = new ArrayList<>();
	expected.add("value3");
	expected.add("value1");
	assertEquals(expected, conf2.getList("key1"));

	expected = new ArrayList<>();
	expected.add("value4");
	expected.add("value2");
	assertEquals(expected, conf2.getList("key2"));
	}

	/**
	* Tests asEventSource() if an exception is expected.
	*/
	@Test
	public void testAsEventSourceNonSupportedEx() {
	assertThrows(ConfigurationRuntimeException.class, () -> ConfigurationUtils.asEventSource(this, false));
	}

	/**
	* Tests asEventSource() if the passed in object implements this interface.
	*/
	@Test
	public void testAsEventSourceSupported() {
	final XMLConfiguration src = new XMLConfiguration();
	assertSame(src, ConfigurationUtils.asEventSource(src, true));
	}

	/**
	* Tests asEventSource() if a mock object has to be returned.
	*/
	@Test
	public void testAsEventSourceUnsupportedMock() {
	@SuppressWarnings("unchecked")
	final EventListener<ConfigurationEvent> cl = mock(EventListener.class);
	final EventSource source = ConfigurationUtils.asEventSource(this, true);
	source.addEventListener(ConfigurationEvent.ANY, cl);
	assertFalse(source.removeEventListener(ConfigurationEvent.ANY, cl));
	source.addEventListener(ConfigurationEvent.ANY, null);
	}

	/**
	* Tests cloning a configuration that supports this operation.
	*/
	@Test
	public void testCloneConfiguration() {
	final BaseHierarchicalConfiguration conf = new BaseHierarchicalConfiguration();
	conf.addProperty("test", "yes");
	final BaseHierarchicalConfiguration copy = (BaseHierarchicalConfiguration) ConfigurationUtils.cloneConfiguration(conf);
	assertNotSame(conf, copy);
	assertEquals("yes", copy.getString("test"));
	}

	/**
	* Tests cloning a configuration that does not support this operation. This should cause an exception.
	*/
	@Test
	public void testCloneConfigurationNotSupported() {
	final Configuration myNonCloneableConfig = new NonCloneableConfiguration();
	assertThrows(ConfigurationRuntimeException.class, () -> ConfigurationUtils.cloneConfiguration(myNonCloneableConfig));
	}

	/**
	* Tests cloning a <b>null</b> configuration.
	*/
	@Test
	public void testCloneConfigurationNull() {
	assertNull(ConfigurationUtils.cloneConfiguration(null));
	}

	/**
	* Tests whether errors are handled correctly by cloneIfPossible().
	*/
	@Test
	public void testCloneIfPossibleError() {
	final XMLBuilderParametersImpl params = new XMLBuilderParametersImpl() {
	@Override
	public XMLBuilderParametersImpl clone() {
	throw new ConfigurationRuntimeException();
	}
	};
	assertSame(params, ConfigurationUtils.cloneIfPossible(params));
	}

	/**
	* Tests cloneIfPossible() if the passed in object does not support cloning.
	*/
	@Test
	public void testCloneIfPossibleNotSupported() {
	final Long value = 20130116221714L;
	assertSame(value, ConfigurationUtils.cloneIfPossible(value));
	}

	/**
	* Tests whether cloneIfPossible() can handle null parameters.
	*/
	@Test
	public void testCloneIfPossibleNull() {
	assertNull(ConfigurationUtils.cloneIfPossible(null));
	}

	/**
	* Tests whether an object can be cloned which supports cloning.
	*/
	@Test
	public void testCloneIfPossibleSupported() {
	final XMLBuilderParametersImpl params = new XMLBuilderParametersImpl();
	params.setPublicID("testID");
	params.setSchemaValidation(true);
	final XMLBuilderParametersImpl clone = (XMLBuilderParametersImpl) ConfigurationUtils.cloneIfPossible(params);
	assertNotSame(params, clone);
	final Map<String, Object> map = clone.getParameters();
	for (final Map.Entry<String, Object> e : params.getParameters().entrySet()) {
	if (!e.getKey().startsWith("config-")) {
	assertEquals(e.getValue(), map.get(e.getKey()), "Wrong value for field " + e.getKey());
	}
	}
	}

	/**
	* Tests whether a Synchronizer can be cloned using its clone() method.
	*/
	@Test
	public void testCloneSynchronizerClone() {
	final CloneableSynchronizer sync = new CloneableSynchronizer(false);
	final CloneableSynchronizer sync2 = (CloneableSynchronizer) ConfigurationUtils.cloneSynchronizer(sync);
	assertTrue(sync2.isCloned());
	}

	/**
	* Tests cloneSynchronizer() if the argument cannot be cloned.
	*/
	@Test
	public void testCloneSynchronizerFailed() {
	final NonCloneableSynchronizer synchronizer = new NonCloneableSynchronizer();
	assertThrows(ConfigurationRuntimeException.class, () -> ConfigurationUtils.cloneSynchronizer(synchronizer));
	}

	/**
	* Tests whether a new Synchronizer can be created using reflection.
	*/
	@Test
	public void testCloneSynchronizerNewInstance() {
	final SynchronizerTestImpl sync = new SynchronizerTestImpl();
	final SynchronizerTestImpl sync2 = (SynchronizerTestImpl) ConfigurationUtils.cloneSynchronizer(sync);
	assertNotNull(sync2);
	assertNotSame(sync, sync2);
	}

	/**
	* Tests whether the NoOpSyhnchronizer can be cloned.
	*/
	@Test
	public void testCloneSynchronizerNoOp() {
	assertSame(NoOpSynchronizer.INSTANCE, ConfigurationUtils.cloneSynchronizer(NoOpSynchronizer.INSTANCE));
	}

	/**
	* Tries to clone a null Synchronizer.
	*/
	@Test
	public void testCloneSynchronizerNull() {
	assertThrows(IllegalArgumentException.class, () -> ConfigurationUtils.cloneSynchronizer(null));
	}

	/**
	* Tests converting a configuration into a hierarchical one that is already hierarchical.
	*/
	@Test
	public void testConvertHierarchicalToHierarchical() {
	final Configuration conf = new BaseHierarchicalConfiguration();
	conf.addProperty("test", "yes");
	assertSame(conf, ConfigurationUtils.convertToHierarchical(conf));
	}

	/**
	* Tests converting an already hierarchical configuration using an expression engine. The new engine should be set.
	*/
	@Test
	public void testConvertHierarchicalToHierarchicalEngine() {
	final BaseHierarchicalConfiguration hc = new BaseHierarchicalConfiguration();
	final ExpressionEngine engine = new DefaultExpressionEngine(DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS);
	assertSame(hc, ConfigurationUtils.convertToHierarchical(hc, engine));
	assertSame(engine, hc.getExpressionEngine());
	}

	/**
	* Tests converting an already hierarchical configuration using a null expression engine. In this case the expression
	* engine of the configuration should not be touched.
	*/
	@Test
	public void testConvertHierarchicalToHierarchicalNullEngine() {
	final BaseHierarchicalConfiguration hc = new BaseHierarchicalConfiguration();
	final ExpressionEngine engine = new DefaultExpressionEngine(DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS);
	hc.setExpressionEngine(engine);
	assertSame(hc, ConfigurationUtils.convertToHierarchical(hc, null));
	assertSame(engine, hc.getExpressionEngine());
	}

	/**
	* Tests converting a null configuration to a hierarchical one. The result should be null, too.
	*/
	@Test
	public void testConvertNullToHierarchical() {
	assertNull(ConfigurationUtils.convertToHierarchical(null));
	}

	/**
	* Tests converting a configuration into a hierarchical one.
	*/
	@Test
	public void testConvertToHierarchical() {
	final Configuration conf = new BaseConfiguration();
	for (int i = 0; i < 10; i++) {
	conf.addProperty("test" + i, "value" + i);
	conf.addProperty("test.list", "item" + i);
	}

	final BaseHierarchicalConfiguration hc = (BaseHierarchicalConfiguration) ConfigurationUtils.convertToHierarchical(conf);
	for (final Iterator<String> it = conf.getKeys(); it.hasNext();) {
	final String key = it.next();
	assertEquals(conf.getProperty(key), hc.getProperty(key), "Wrong value for key " + key);
	}
	}

	/**
	* Tests converting a configuration into a hierarchical one if some of its properties contain escaped list delimiter
	* characters.
	*/
	@Test
	public void testConvertToHierarchicalDelimiters() {
	final BaseConfiguration conf = new BaseConfiguration();
	conf.setListDelimiterHandler(new DefaultListDelimiterHandler(','));
	conf.addProperty("test.key", "1\\,2\\,3");
	assertEquals("1,2,3", conf.getString("test.key"));
	final HierarchicalConfiguration<?> hc = ConfigurationUtils.convertToHierarchical(conf);
	assertEquals("1,2,3", hc.getString("test.key"));
	}

	/**
	* Tests converting a configuration to a hierarchical one using a specific expression engine.
	*/
	@Test
	public void testConvertToHierarchicalEngine() {
	final Configuration conf = new BaseConfiguration();
	conf.addProperty("test(a)", Boolean.TRUE);
	conf.addProperty("test(b)", Boolean.FALSE);
	final DefaultExpressionEngine engine = new DefaultExpressionEngine(
	new DefaultExpressionEngineSymbols.Builder(DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS).setIndexStart("[").setIndexEnd("]").create());
	final HierarchicalConfiguration<?> hc = ConfigurationUtils.convertToHierarchical(conf, engine);
	assertTrue(hc.getBoolean("test(a)"));
	assertFalse(hc.getBoolean("test(b)"));
	}

	/**
	* Tests converting a configuration to a hierarchical one that contains a property with multiple values. This test is
	* related to CONFIGURATION-346.
	*/
	@Test
	public void testConvertToHierarchicalMultiValues() {
	final BaseConfiguration config = new BaseConfiguration();
	config.setListDelimiterHandler(new DefaultListDelimiterHandler(','));
	config.addProperty("test", "1,2,3");
	final HierarchicalConfiguration<?> hc = ConfigurationUtils.convertToHierarchical(config);
	assertEquals(1, hc.getInt("test(0)"));
	assertEquals(2, hc.getInt("test(1)"));
	assertEquals(3, hc.getInt("test(2)"));
	}

	/**
	* Tests that the structure of the resulting hierarchical configuration does not depend on the order of properties in
	* the source configuration. This test is related to CONFIGURATION-604.
	*/
	@Test
	public void testConvertToHierarchicalOrderOfProperties() {
	final PropertiesConfiguration config = new PropertiesConfiguration();
	config.addProperty("x.y.z", true);
	config.addProperty("x.y", true);
	@SuppressWarnings("unchecked")
	final HierarchicalConfiguration<ImmutableNode> hc = (HierarchicalConfiguration<ImmutableNode>) ConfigurationUtils.convertToHierarchical(config);
	final ImmutableNode rootNode = hc.getNodeModel().getNodeHandler().getRootNode();
	final ImmutableNode nodeX = rootNode.getChildren().get(0);
	assertEquals(1, nodeX.getChildren().size());
	}

	@Test
	public void testCopy() {
	// create the source configuration
	final Configuration conf1 = new BaseConfiguration();
	conf1.addProperty("key1", "value1");
	conf1.addProperty("key2", "value2");

	// create the target configuration
	final Configuration conf2 = new BaseConfiguration();
	conf2.addProperty("key1", "value3");
	conf2.addProperty("key2", "value4");

	// copy the source configuration into the target configuration
	ConfigurationUtils.copy(conf1, conf2);

	assertEquals("value1", conf2.getProperty("key1"));
	assertEquals("value2", conf2.getProperty("key2"));
	}

	/**
	* Tests whether runtime exceptions can be enabled.
	*/
	@Test
	public void testEnableRuntimeExceptions() {
	final PropertiesConfiguration config = new PropertiesConfiguration() {
	@Override
	protected void addPropertyDirect(final String key, final Object value) {
	// always simulate an exception
	fireError(ConfigurationErrorEvent.WRITE, ConfigurationEvent.ADD_PROPERTY, key, value, new RuntimeException("A faked exception!"));
	}
	};
	config.clearErrorListeners();
	ConfigurationUtils.enableRuntimeExceptions(config);
	assertThrows(ConfigurationRuntimeException.class, () -> config.addProperty("test", "testValue"));
	}

	/**
	* Tries to enable runtime exceptions for a configuration that does not inherit from EventSource. This should cause an
	* exception.
	*/
	@Test
	public void testEnableRuntimeExceptionsInvalid() {
	final Configuration c = mock(Configuration.class);
	assertThrows(IllegalArgumentException.class, () -> ConfigurationUtils.enableRuntimeExceptions(c));
	}

	/**
	* Tries to enable runtime exceptions for a null configuration. This should cause an exception.
	*/
	@Test
	public void testEnableRuntimeExceptionsNull() {
	assertThrows(IllegalArgumentException.class, () -> ConfigurationUtils.enableRuntimeExceptions(null));
	}

	/**
	* Tests whether a class can be loaded if it is not found by the CCL.
	*/
	@Test
	public void testLoadClassCCLNotFound() throws ClassNotFoundException {
	Thread.currentThread().setContextClassLoader(new ClassLoader() {
	@Override
	public Class<?> loadClass(final String name) throws ClassNotFoundException {
	throw new ClassNotFoundException(name);
	}
	});
	assertEquals(CLS_NAME, ConfigurationUtils.loadClass(CLS_NAME).getName());
	}

	/**
	* Tests whether a class can be loaded if there is no CCL.
	*/
	@Test
	public void testLoadClassCCLNull() throws ClassNotFoundException {
	Thread.currentThread().setContextClassLoader(null);
	assertEquals(CLS_NAME, ConfigurationUtils.loadClass(CLS_NAME).getName());
	}

	/**
	* Tests whether a class can be loaded from CCL.
	*/
	@Test
	public void testLoadClassFromCCL() throws ClassNotFoundException {
	Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
	assertEquals(CLS_NAME, ConfigurationUtils.loadClass(CLS_NAME).getName());
	}

	/**
	* Tests loadClassNoEx() if the class can be resolved.
	*/
	@Test
	public void testLoadClassNoExFound() {
	assertEquals(CLS_NAME, ConfigurationUtils.loadClassNoEx(CLS_NAME).getName());
	}

	/**
	* Tests loadClassNoEx() if the class cannot be resolved.
	*/
	@Test
	public void testLoadClassNoExNotFound() {
	assertThrows(ConfigurationRuntimeException.class, () -> ConfigurationUtils.loadClassNoEx("a non existing class!"));
	}

	/**
	* Tests the behavior of loadClass() for a non-existing class.
	*/
	@Test
	public void testLoadClassNotFound() {
	assertThrows(ClassNotFoundException.class, () -> ConfigurationUtils.loadClass("a non existing class!"));
	}

	@Test
	public void testToString() {
	final Configuration config = new BaseConfiguration();
	final String lineSeparator = System.lineSeparator();

	assertEquals("", ConfigurationUtils.toString(config));

	config.setProperty("one", "1");
	assertEquals("one=1", ConfigurationUtils.toString(config));

	config.setProperty("two", "2");
	assertEquals("one=1" + lineSeparator + "two=2", ConfigurationUtils.toString(config));

	config.clearProperty("one");
	assertEquals("two=2", ConfigurationUtils.toString(config));

	config.setProperty("one", "1");
	assertEquals("two=2" + lineSeparator + "one=1", ConfigurationUtils.toString(config));
	}
	}