code: /*
   * #%L
   * Simmetrics Core
   * %%
   * Copyright (C) 2014 - 2016 Simmetrics 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.
   * #L%
   */
  package org.simmetrics.simplifiers;
  
  import static java.lang.String.format;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertThat;
  import static org.junit.Assert.fail;
  import static org.simmetrics.matchers.ImplementsToString.implementsToString;
  import org.junit.Before;
  import org.junit.Test;
  
  @SuppressWarnings("javadoc")
  public abstract class SimplifierTest {
  	protected static final class T {
  		final String expected;
  		final String string;
  
  		public T(String string, String expected) {
  			this.string = string;
  			this.expected = expected;
  		}
  
  		public String string() {
  			return string;
  		}
  
  	}
  
  	private static void testSimplified(String expected, String simplified) {
  		assertNotNull(simplified);
  		assertEquals(expected, simplified);
  	}
  
  	protected Simplifier simplifier;
  
  	protected T[] tests;
  
  	@Test
  	public void containsEmptyTest() {
  		for (T t : tests) {
  			if (t.string.isEmpty()) {
  				return;
  			}
  		}
  
  		fail("Test must contain a case with empty string");
  	}
  
  	protected abstract Simplifier getSimplifier();
  
  	protected abstract T[] getTests();
  
  	@Before
  	public final void setUp() throws Exception {
  		simplifier = getSimplifier();
  		tests = getTests();
  	}
  
  	@Test
  	public final void shouldImplementToString() {
  		assertThat(simplifier, implementsToString());
  	}
  
  	@Test
  	public final void simplfy() {
  		for (T t : tests) {
  			testSimplified(t.expected, simplifier.simplify(t.string));
  		}
  	}
  
  	@Test(expected = NullPointerException.class)
  	public final void simplfyNullPointerException() {
  		simplifier.simplify(null);
  	}
  
  	public final void generateSimplified() {
  		System.out.println(simplifier);
  		for (T t : tests) {
  			System.out.println(format("new T(\"%s\", \"%s\"),", t.string,
  					simplifier.simplify(t.string)));
  		}
  	}
  }
  