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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.implcore.stats;
import static com.google.common.truth.Truth.assertThat;
import io.opencensus.stats.StatsCollectionState;
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 CurrentStatsState}. */
@RunWith(JUnit4.class)
public final class CurrentStatsStateTest {
@Rule public final ExpectedException thrown = ExpectedException.none();
@Test
public void defaultState() {
assertThat(new CurrentStatsState().get()).isEqualTo(StatsCollectionState.ENABLED);
}
@Test
public void setState() {
CurrentStatsState state = new CurrentStatsState();
assertThat(state.set(StatsCollectionState.DISABLED)).isTrue();
assertThat(state.getInternal()).isEqualTo(StatsCollectionState.DISABLED);
assertThat(state.set(StatsCollectionState.ENABLED)).isTrue();
assertThat(state.getInternal()).isEqualTo(StatsCollectionState.ENABLED);
assertThat(state.set(StatsCollectionState.ENABLED)).isFalse();
}
@Test
public void preventNull() {
CurrentStatsState state = new CurrentStatsState();
thrown.expect(NullPointerException.class);
thrown.expectMessage("state");
state.set(null);
}
@Test
public void preventSettingStateAfterReadingState() {
CurrentStatsState state = new CurrentStatsState();
state.get();
thrown.expect(IllegalStateException.class);
thrown.expectMessage("State was already read, cannot set state.");
state.set(StatsCollectionState.DISABLED);
}
}
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