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/*
* Copyright 2017, OpenCensus Authors
*
* 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 io.opencensus.common;
import static com.google.common.truth.Truth.assertThat;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Tests for {@link Functions}. */
@RunWith(JUnit4.class)
public class FunctionsTest {
@Rule public ExpectedException thrown = ExpectedException.none();
@Test
public void testReturnNull() {
assertThat(Functions.returnNull().apply("ignored")).isNull();
}
@Test
public void testReturnConstant() {
assertThat(Functions.returnConstant(123).apply("ignored")).isEqualTo(123);
}
@Test
public void testThrowIllegalArgumentException() {
Function<Object, Void> f = Functions.throwIllegalArgumentException();
thrown.expect(IllegalArgumentException.class);
f.apply("ignored");
}
@Test
public void testThrowAssertionError() {
Function<Object, Void> f = Functions.throwAssertionError();
thrown.handleAssertionErrors();
thrown.expect(AssertionError.class);
f.apply("ignored");
}
}
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