/*
* Copyright (C) 2014 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.testing.compile;
import static com.google.common.truth.Truth.assertThat;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
/**
* Tests the {@link CompilationRule} by applying it to this test.
*/
@RunWith(JUnit4.class)
public class CompilationRuleTest {
@Rule public CompilationRule compilationRule = new CompilationRule();
private final AtomicInteger executions = new AtomicInteger();
@Test public void testMethodsExecuteExactlyOnce() {
assertThat(executions.getAndIncrement()).is(0);
}
@Before /* we also make sure that getElements works in a @Before method */
@Test public void getElements() {
assertThat(compilationRule.getElements()).isNotNull();
}
@Before /* we also make sure that getTypes works in a @Before method */
@Test public void getTypes() {
assertThat(compilationRule.getTypes()).isNotNull();
}
/**
* Do some non-trivial operation with {@link Element} instances because they stop working after
* compilation stops.
*/
@Test public void elementsAreValidAndWorking() {
Elements elements = compilationRule.getElements();
TypeElement stringElement = elements.getTypeElement(String.class.getName());
assertThat(stringElement.getEnclosingElement())
.isEqualTo(elements.getPackageElement("java.lang"));
}
/**
* Do some non-trivial operation with {@link TypeMirror} instances because they stop working after
* compilation stops.
*/
@Test public void typeMirrorsAreValidAndWorking() {
Elements elements = compilationRule.getElements();
Types types = compilationRule.getTypes();
DeclaredType arrayListOfString = types.getDeclaredType(
elements.getTypeElement(ArrayList.class.getName()),
elements.getTypeElement(String.class.getName()).asType());
DeclaredType listOfExtendsObjectType = types.getDeclaredType(
elements.getTypeElement(List.class.getName()),
types.getWildcardType(elements.getTypeElement(Object.class.getName()).asType(), null));
assertThat(types.isAssignable(arrayListOfString, listOfExtendsObjectType)).isTrue();
}
}