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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.testutil;
import static com.google.common.truth.Truth.assertWithMessage;
/**
* Test thread implementation that allows the use of assertions within
* spawned threads.
*
* Main test method must call {@link TestThread#joinAndAssertState(long)}
* for each spawned test thread.
*/
public abstract class TestThread extends Thread {
Throwable testException = null;
boolean isSucceeded = false;
/**
* Specific test thread implementation overrides this method.
*/
abstract public void runTest() throws Exception;
@Override public final void run() {
try {
runTest();
isSucceeded = true;
} catch (Exception | AssertionError e) {
testException = e;
}
}
/**
* Joins test thread (waiting specified number of ms) and validates that
* it has been completed successfully.
*/
public void joinAndAssertState(long timeout) throws InterruptedException {
join(timeout);
Throwable exception = this.testException;
if (isAlive()) {
exception = new AssertionError (
"Test thread " + getName() + " is still alive");
exception.setStackTrace(getStackTrace());
}
if(exception != null) {
AssertionError error = new AssertionError("Test thread " + getName() + " failed to execute");
error.initCause(exception);
throw error;
}
assertWithMessage("Test thread " + getName() + " has not run successfully").that(isSucceeded)
.isTrue();
}
}
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