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/*
* Copyright (c) 2011 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 com.google.common.annotations.GwtIncompatible;
import org.junit.AssumptionViolatedException;
/**
* Provides a way to use Truth to perform JUnit "assumptions." An assumption is a check that, if
* false, aborts (skips) the test. This is especially useful in JUnit theories, parameterized tests,
* or other combinatorial tests where some subset of the combinations are simply not applicable for
* testing.
*
* <p>For example:
*
* <pre>{@code
* import static com.google.common.truth.Truth.assertThat;
* import static com.google.common.truth.TruthJUnit.assume;
*
* public void @Test testFoosAgainstBars {
* assume().that(foo).isNotNull();
* assume().that(bar).isNotNull();
* assertThat(foo.times(bar)).isEqualTo(blah);
* }
* }</pre>
*
* @author David Saff
* @author Christian Gruber (cgruber@israfil.net)
*/
@GwtIncompatible("JUnit4")
@J2ktIncompatible
public final class TruthJUnit {
@SuppressWarnings("ConstantCaseForConstants") // Despite the "Builder" name, it's not mutable.
private static final StandardSubjectBuilder ASSUME =
StandardSubjectBuilder.forCustomFailureStrategy(
failure -> {
AssumptionViolatedException assumptionViolated =
new AssumptionViolatedException(failure.getMessage(), failure.getCause());
assumptionViolated.setStackTrace(failure.getStackTrace());
throw assumptionViolated;
});
/**
* Begins a call chain with the fluent Truth API. If the check made by the chain fails, it will
* throw {@link AssumptionViolatedException}.
*/
public static final StandardSubjectBuilder assume() {
return ASSUME;
}
private TruthJUnit() {}
}
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