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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript.tests;

import java.lang.reflect.Method;

import org.junit.Assert;
import org.junit.Test;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextAction;
import org.mozilla.javascript.ContextFactory;
import org.mozilla.javascript.EcmaError;
import org.mozilla.javascript.ScriptableObject;

/**
 * Test that read-only properties can be... set when needed.
 * This was the standard behavior in Rhino until 1.7R2 but has changed then.
 * It is needed by HtmlUnit to simulate IE as well as FF2 (but not FF3).
 * @see Rhino bug 519933
 * @author Marc Guillemot
 */
public class WriteReadOnlyPropertyTest {

	/**
	 * @throws Exception if the test fails
	 */
	@Test
	public void testWriteReadOnly_accepted() throws Exception {
		testWriteReadOnly(true);
	}

	/**
	 * @throws Exception if the test fails
	 */
	@Test
	public void testWriteReadOnly_throws() throws Exception {
		try {
			testWriteReadOnly(false);
			Assert.fail();
		}
		catch (EcmaError e) {
			Assert.assertTrue(e.getMessage(), e.getMessage().contains("Cannot set property myProp that has only a getter"));
		}
	}

	void testWriteReadOnly(final boolean acceptWriteReadOnly) throws Exception {
		final Method readMethod = Foo.class.getMethod("getMyProp", (Class[])null);
		final Foo foo = new Foo("hello");
        foo.defineProperty("myProp", null, readMethod, null, ScriptableObject.EMPTY);

		final String script = "foo.myProp = 123; foo.myProp";

		final ContextAction action = new ContextAction() {
			public Object run(final Context cx) {

				final ScriptableObject top = cx.initStandardObjects();
				ScriptableObject.putProperty(top, "foo", foo);

				cx.evaluateString(top, script, "script", 0, null);
				return null;
			}
		};

		final ContextFactory contextFactory = new ContextFactory() {
			@Override
			protected boolean hasFeature(final Context cx, final int featureIndex) {
				if (Context.FEATURE_STRICT_MODE == featureIndex) {
					return !acceptWriteReadOnly;
				}
				return super.hasFeature(cx, featureIndex);
			}
		};
		contextFactory.call(action);
	}

	/**
	 * Simple utility allowing to better see the concerned scope while debugging
	 */
	static class Foo extends ScriptableObject
	{
		final String prop_;
		Foo(final String label)
		{
			prop_ = label;
		}

		@Override
		public String getClassName()
		{
			return "Foo";
		}

		public String getMyProp()
		{
			return prop_;
		}
	}
}