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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.tags;
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;
/** Unit tests for {@link Tags}. */
@RunWith(JUnit4.class)
public class TagsTest {
@Rule public ExpectedException thrown = ExpectedException.none();
@Test
public void loadTagsComponent_UsesProvidedClassLoader() {
final RuntimeException toThrow = new RuntimeException("UseClassLoader");
thrown.expect(RuntimeException.class);
thrown.expectMessage("UseClassLoader");
Tags.loadTagsComponent(
new ClassLoader() {
@Override
public Class<?> loadClass(String name) {
throw toThrow;
}
});
}
@Test
public void loadTagsComponent_IgnoresMissingClasses() {
ClassLoader classLoader =
new ClassLoader() {
@Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
throw new ClassNotFoundException();
}
};
assertThat(Tags.loadTagsComponent(classLoader).getClass().getName())
.isEqualTo("io.opencensus.tags.NoopTags$NoopTagsComponent");
}
// There is only one test that modifies tagging state in the Tags class, since the state is
// global, and it could affect other tests. NoopTagsTest has more thorough tests for tagging
// state.
@Test
@SuppressWarnings("deprecation")
public void testState() {
// Test that setState ignores its input.
Tags.setState(TaggingState.ENABLED);
assertThat(Tags.getState()).isEqualTo(TaggingState.DISABLED);
// Test that setState cannot be called after getState.
thrown.expect(IllegalStateException.class);
thrown.expectMessage("State was already read, cannot set state.");
Tags.setState(TaggingState.ENABLED);
}
@Test
public void defaultTagger() {
assertThat(Tags.getTagger()).isEqualTo(NoopTags.getNoopTagger());
}
@Test
public void defaultTagContextSerializer() {
assertThat(Tags.getTagPropagationComponent())
.isEqualTo(NoopTags.getNoopTagPropagationComponent());
}
}
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