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/*
* Copyright 2018, 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.internal;
import static com.google.common.truth.Truth.assertThat;
import io.opencensus.implcore.internal.CurrentState.State;
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 CurrentState}. */
@RunWith(JUnit4.class)
public final class CurrentStateTest {
@Rule public final ExpectedException thrown = ExpectedException.none();
@Test
public void defaultState() {
assertThat(new CurrentState(State.ENABLED).get()).isEqualTo(State.ENABLED);
}
@Test
public void setState() {
CurrentState currentState = new CurrentState(State.ENABLED);
assertThat(currentState.set(State.DISABLED)).isTrue();
assertThat(currentState.getInternal()).isEqualTo(State.DISABLED);
assertThat(currentState.set(State.ENABLED)).isTrue();
assertThat(currentState.getInternal()).isEqualTo(State.ENABLED);
assertThat(currentState.set(State.ENABLED)).isFalse();
}
@Test
public void preventSettingStateAfterReadingState() {
CurrentState currentState = new CurrentState(State.ENABLED);
currentState.get();
thrown.expect(IllegalStateException.class);
thrown.expectMessage("State was already read, cannot set state.");
currentState.set(State.DISABLED);
}
}
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