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Java example source code file (MatcherTest.java)

This example Java source code file (MatcherTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

annotation, bar, baz, foo, integer, ioexception, matchertest, nosuchmethodexception, object, package, reflection, runnable, string, suppresswarnings, testcase, unnecessaryboxing, util

The MatcherTest.java Java example source code

/**
 * Copyright (C) 2006 Google Inc.
 *
 * 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 com.google.inject.matcher;

import static com.google.inject.Asserts.assertEqualWhenReserialized;
import static com.google.inject.Asserts.assertEqualsBothWays;
import static com.google.inject.matcher.Matchers.annotatedWith;
import static com.google.inject.matcher.Matchers.any;
import static com.google.inject.matcher.Matchers.identicalTo;
import static com.google.inject.matcher.Matchers.inPackage;
import static com.google.inject.matcher.Matchers.inSubpackage;
import static com.google.inject.matcher.Matchers.not;
import static com.google.inject.matcher.Matchers.only;
import static com.google.inject.matcher.Matchers.returns;
import static com.google.inject.matcher.Matchers.subclassesOf;

import com.google.inject.name.Named;
import com.google.inject.name.Names;

import junit.framework.TestCase;

import java.io.IOException;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;
import java.util.AbstractList;

/**
 * @author crazybob@google.com (Bob Lee)
 */

public class MatcherTest extends TestCase {

  public void testAny() {
    assertTrue(any().matches(null));
    assertEquals("any()", any().toString());
    assertEqualsBothWays(any(), any());
    assertFalse(any().equals(not(any())));
  }

  public void testNot() {
    assertFalse(not(any()).matches(null));
    assertEquals("not(any())", not(any()).toString());
    assertEqualsBothWays(not(any()), not(any()));
    assertFalse(not(any()).equals(any()));
  }

  public void testAnd() {
    assertTrue(any().and(any()).matches(null));
    assertFalse(any().and(not(any())).matches(null));
    assertEquals("and(any(), any())", any().and(any()).toString());
    assertEqualsBothWays(any().and(any()), any().and(any()));
    assertFalse(any().and(any()).equals(not(any())));
  }

  public void testOr() {
    assertTrue(any().or(not(any())).matches(null));
    assertFalse(not(any()).or(not(any())).matches(null));
    assertEquals("or(any(), any())", any().or(any()).toString());
    assertEqualsBothWays(any().or(any()), any().or(any()));
    assertFalse(any().or(any()).equals(not(any())));
  }

  public void testAnnotatedWith() {
    assertTrue(annotatedWith(Foo.class).matches(Bar.class));
    assertFalse(annotatedWith(Foo.class).matches(
        MatcherTest.class.getMethods()[0]));
    assertEquals("annotatedWith(Foo.class)", annotatedWith(Foo.class).toString());
    assertEqualsBothWays(annotatedWith(Foo.class), annotatedWith(Foo.class));
    assertFalse(annotatedWith(Foo.class).equals(annotatedWith(Named.class)));

    try {
      annotatedWith(Baz.class);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

  public void testSubclassesOf() {
    assertTrue(subclassesOf(Runnable.class).matches(Runnable.class));
    assertTrue(subclassesOf(Runnable.class).matches(MyRunnable.class));
    assertFalse(subclassesOf(Runnable.class).matches(Object.class));
    assertEquals("subclassesOf(Runnable.class)", subclassesOf(Runnable.class).toString());
    assertEqualsBothWays(subclassesOf(Runnable.class), subclassesOf(Runnable.class));
    assertFalse(subclassesOf(Runnable.class).equals(subclassesOf(Object.class)));
  }

  public void testOnly() {
    assertTrue(only(1000).matches(1000));
    assertFalse(only(1).matches(1000));
    assertEquals("only(1)", only(1).toString());
    assertEqualsBothWays(only(1), only(1));
    assertFalse(only(1).equals(only(2)));
  }

  @SuppressWarnings("UnnecessaryBoxing")
  public void testIdenticalTo() {
    Object o = new Object();
    assertEquals("identicalTo(1)", identicalTo(1).toString());
    assertTrue(identicalTo(o).matches(o));
    assertFalse(identicalTo(o).matches(new Object()));
    assertEqualsBothWays(identicalTo(o), identicalTo(o));
    assertFalse(identicalTo(1).equals(identicalTo(new Integer(1))));
  }

  public void testInPackage() {
    Package matchersPackage = Matchers.class.getPackage();
    assertEquals("inPackage(com.google.inject.matcher)", inPackage(matchersPackage).toString());
    assertTrue(inPackage(matchersPackage).matches(MatcherTest.class));
    assertFalse(inPackage(matchersPackage).matches(Object.class));
    assertEqualsBothWays(inPackage(matchersPackage), inPackage(matchersPackage));
    assertFalse(inPackage(matchersPackage).equals(inPackage(Object.class.getPackage())));
  }

  public void testInSubpackage() {
    String stringPackageName = String.class.getPackage().getName();
    assertEquals("inSubpackage(java.lang)", inSubpackage(stringPackageName).toString());
    assertTrue(inSubpackage(stringPackageName).matches(Object.class));
    assertTrue(inSubpackage(stringPackageName).matches(Method.class));
    assertFalse(inSubpackage(stringPackageName).matches(Matchers.class));
    assertFalse(inSubpackage("jav").matches(Object.class));
    assertEqualsBothWays(inSubpackage(stringPackageName), inSubpackage(stringPackageName));
    assertFalse(inSubpackage(stringPackageName).equals(inSubpackage(Matchers.class.getPackage().getName())));
  }

  public void testReturns() throws NoSuchMethodException {
    Matcher<Method> predicate = returns(only(String.class));
    assertTrue(predicate.matches(
        Object.class.getMethod("toString")));
    assertFalse(predicate.matches(
        Object.class.getMethod("hashCode")));
    assertEquals("returns(only(class java.lang.String))", returns(only(String.class)).toString());
    assertEqualsBothWays(predicate, returns(only(String.class)));
    assertFalse(predicate.equals(returns(only(Integer.class))));
  }

  public void testSerialization() throws IOException {
    assertEqualWhenReserialized(any());
    assertEqualWhenReserialized(not(any()));
    assertEqualWhenReserialized(annotatedWith(Named.class));
    assertEqualWhenReserialized(annotatedWith(Names.named("foo")));
    assertEqualWhenReserialized(only("foo"));
    assertEqualWhenReserialized(identicalTo(Object.class));
    assertEqualWhenReserialized(inPackage(String.class.getPackage()));
    assertEqualWhenReserialized(inSubpackage(String.class.getPackage().getName()));
    assertEqualWhenReserialized(returns(any()));
    assertEqualWhenReserialized(subclassesOf(AbstractList.class));
    assertEqualWhenReserialized(only("a").or(only("b")));
    assertEqualWhenReserialized(only("a").and(only("b")));
  }

  static abstract class MyRunnable implements Runnable {}

  @Retention(RetentionPolicy.RUNTIME)
  @interface Foo {}

  @Foo
  static class Bar {}

  @interface Baz {}

  @Baz
  static class Car {}
}

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