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// Copyright 2016 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.android.desugar;
import static com.google.common.truth.Truth.assertThat;
import static com.google.devtools.build.android.desugar.LambdaClassMaker.LAMBDA_METAFACTORY_DUMPER_PROPERTY;
import static org.junit.Assert.fail;
import com.google.common.base.Strings;
import java.io.IOError;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.function.Supplier;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Test for {@link Desugar} */
@RunWith(JUnit4.class)
public class DesugarMainClassTest {
@Test
public void testVerifyLambdaDumpDirectoryRegistration() throws Exception {
if (Strings.isNullOrEmpty(System.getProperty(LAMBDA_METAFACTORY_DUMPER_PROPERTY))) {
testLambdaDumpDirSpecifiedInProgramFail();
} else {
testLambdaDumpDirPassSpecifiedInCmdPass();
}
}
private void testLambdaDumpDirSpecifiedInProgramFail() throws Exception {
// This lambda will fail the dump directory registration, which is intended.
Supplier<Path> supplier =
() -> {
Path path = Paths.get(".").toAbsolutePath();
System.setProperty(LAMBDA_METAFACTORY_DUMPER_PROPERTY, path.toString());
return path;
};
try {
Desugar.verifyLambdaDumpDirectoryRegistered(supplier.get());
fail("Expected NullPointerException");
} catch (NullPointerException e) {
// Expected
}
}
/**
* Test the LambdaMetafactory can be correctly set up by specifying the system property {@code
* LAMBDA_METAFACTORY_DUMPER_PROPERTY} in the command line.
*/
private void testLambdaDumpDirPassSpecifiedInCmdPass() throws IOException {
// The following lambda ensures that the LambdaMetafactory is loaded at the beggining of this
// test, so that the dump directory can be registered.
Supplier<Path> supplier =
() -> {
try {
return Desugar.createAndRegisterLambdaDumpDirectory();
} catch (IOException e) {
throw new IOError(e);
}
};
Path dumpDirectory = supplier.get();
assertThat(dumpDirectory.toAbsolutePath().toString())
.isEqualTo(
Paths.get(System.getProperty(LAMBDA_METAFACTORY_DUMPER_PROPERTY))
.toAbsolutePath()
.toString());
Desugar.verifyLambdaDumpDirectoryRegistered(dumpDirectory);
}
}
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