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ThrowableTypeAssert.java
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ThrowableTypeAssert.java
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/**
* 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.
*
* Copyright 2012-2016 the original author or authors.
*/
package org.assertj.core.api;
import static java.util.Objects.requireNonNull;
import static org.assertj.core.api.Assertions.assertThat;
import org.assertj.core.api.ThrowableAssert.ThrowingCallable;
import org.assertj.core.util.VisibleForTesting;
/**
* Assertion class checking {@link Throwable} type.
* <p>
* The class itself does not do much, it delegates the work to {@link ThrowableAssertAlternative} after calling {@link #isThrownBy(ThrowableAssert.ThrowingCallable)}.
*
* @param <T> type of throwable to be thrown.
*/
public class ThrowableTypeAssert<T extends Throwable> {
@VisibleForTesting
final Class<? extends T> expectedThrowableType;
/**
* Default constructor.
*
* @param throwableType class representing the target (expected) exception.
*/
ThrowableTypeAssert(final Class<? extends T> throwableType) {
this.expectedThrowableType = requireNonNull(throwableType, "exceptionType");
}
/**
* Assert that an exception of type T is thrown by the {@code throwingCallable}
* and allow to chain assertions on the thrown exception.
* <p>
* Example:
* <pre><code class='java'> assertThatExceptionOfType(IOException.class).isThrownBy(() -> { throw new IOException("boom!"); })
* .withMessage("boom!"); </code></pre>
*
* @param throwingCallable code throwing the exception of expected type
* @return return a {@link ThrowableAssertAlternative}.
*/
public ThrowableAssertAlternative<T> isThrownBy(final ThrowingCallable throwingCallable) {
Throwable throwable = ThrowableAssert.catchThrowable(throwingCallable);
assertThat(throwable).hasBeenThrown().isInstanceOf(expectedThrowableType);
@SuppressWarnings("unchecked")
T c = (T) throwable;
return new ThrowableAssertAlternative<>(c);
}
}