tagwritertests.java

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/*
 * Copyright 2002-2006 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.springframework.web.servlet.tags.form;

import junit.framework.TestCase;

import java.io.StringWriter;

import org.springframework.test.AssertThrows;

/**
 * Unit tests for the {@link TagWriter} class.
 * 
 * @author Rob Harrop
 * @author Rick Evans
 * @since 2.0
 */
public final class TagWriterTests extends TestCase {

	private TagWriter writer;

	private StringWriter data;


	protected void setUp() throws Exception {
		this.data = new StringWriter();
		this.writer = new TagWriter(this.data);
	}


	public void testSimpleTag() throws Exception {
		this.writer.startTag("br");
		this.writer.endTag();

		assertEquals("<br/>", this.data.toString());
	}

	public void testEmptyTag() throws Exception {
		this.writer.startTag("input");
		this.writer.writeAttribute("type", "text");
		this.writer.endTag();

		assertEquals("<input type=\"text\"/>", this.data.toString());
	}

	public void testSimpleBlockTag() throws Exception {
		this.writer.startTag("textarea");
		this.writer.appendValue("foobar");
		this.writer.endTag();

		assertEquals("<textarea>foobar</textarea>", this.data.toString());
	}

	public void testBlockTagWithAttributes() throws Exception {
		this.writer.startTag("textarea");
		this.writer.writeAttribute("width", "10");
		this.writer.writeAttribute("height", "20");
		this.writer.appendValue("foobar");
		this.writer.endTag();

		assertEquals("<textarea width=\"10\" height=\"20\">foobar</textarea>", this.data.toString());
	}

	public void testNestedTags() throws Exception {
		this.writer.startTag("span");
		this.writer.writeAttribute("style", "foo");
		this.writer.startTag("strong");
		this.writer.appendValue("Rob Harrop");
		this.writer.endTag();
		this.writer.endTag();

		assertEquals("<span style=\"foo\"><strong>Rob Harrop</strong></span>", this.data.toString());
	}

	public void testMultipleNestedTags() throws Exception {
		this.writer.startTag("span");
		this.writer.writeAttribute("class", "highlight");
		{
			this.writer.startTag("strong");
			this.writer.appendValue("Rob");
			this.writer.endTag();
		}
		this.writer.appendValue(" ");
		{
			this.writer.startTag("emphasis");
			this.writer.appendValue("Harrop");
			this.writer.endTag();
		}
		this.writer.endTag();

		assertEquals("<span class=\"highlight\"><strong>Rob</strong> <emphasis>Harrop</emphasis></span>", this.data.toString());
	}

	public void testWriteInterleavedWithForceBlock() throws Exception {
		this.writer.startTag("span");
		this.writer.forceBlock();
		this.data.write("Rob Harrop"); // interleaved writing
		this.writer.endTag();

		assertEquals("<span>Rob Harrop</span>", this.data.toString());
	}

	public void testAppendingValue() throws Exception {
		this.writer.startTag("span");
		this.writer.appendValue("Rob ");
		this.writer.appendValue("Harrop");
		this.writer.endTag();

		assertEquals("<span>Rob Harrop</span>", this.data.toString());
	}

	public void testCtorWithNullWriter() throws Exception {
		new AssertThrows(IllegalArgumentException.class) {
			public void test() throws Exception {
				new TagWriter(null);
			}
		}.runTest();
	}

}