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TruthAssertThatTest.java
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TruthAssertThatTest.java
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/*
* 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.common.truth;
import static com.google.common.truth.Truth.assert_;
import static java.util.Arrays.asList;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Ordering;
import com.google.common.reflect.TypeToken;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for the FEST-alike assertThat() entry point.
*
* @author Christian Gruber (cgruber@israfil.net)
*/
@RunWith(JUnit4.class)
public class TruthAssertThatTest {
private static TypeToken<?> methodToReturnTypeToken(Method input) {
return TypeToken.of(Iterables.getOnlyElement(asList(input.getParameterTypes())));
}
@Test
public void staticAssertThatMethodsMatchStandardSubjectBuilderInstanceMethods() {
ImmutableSortedSet<TypeToken<?>> verbTypes =
FluentIterable.from(asList(StandardSubjectBuilder.class.getMethods()))
.filter(input -> input.getName().equals("that"))
.transform(TruthAssertThatTest::methodToReturnTypeToken)
.toSortedSet(Ordering.usingToString());
ImmutableSortedSet<TypeToken<?>> truthTypes =
FluentIterable.from(asList(Truth.class.getMethods()))
.filter(
input ->
input.getName().equals("assertThat") && Modifier.isStatic(input.getModifiers()))
.transform(TruthAssertThatTest::methodToReturnTypeToken)
.toSortedSet(Ordering.usingToString());
assert_().that(verbTypes).isNotEmpty();
assert_().that(truthTypes).isNotEmpty();
assert_().that(truthTypes).containsExactlyElementsIn(verbTypes);
}
}