1 /* 2 * Copyright 2018, OpenCensus Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.opencensus.implcore.internal; 18 19 import static com.google.common.truth.Truth.assertThat; 20 21 import io.opencensus.implcore.internal.CurrentState.State; 22 import org.junit.Rule; 23 import org.junit.Test; 24 import org.junit.rules.ExpectedException; 25 import org.junit.runner.RunWith; 26 import org.junit.runners.JUnit4; 27 28 /** Tests for {@link CurrentState}. */ 29 @RunWith(JUnit4.class) 30 public final class CurrentStateTest { 31 32 @Rule public final ExpectedException thrown = ExpectedException.none(); 33 34 @Test 35 public void defaultState() { 36 assertThat(new CurrentState(State.ENABLED).get()).isEqualTo(State.ENABLED); 37 } 38 39 @Test 40 public void setState() { 41 CurrentState currentState = new CurrentState(State.ENABLED); 42 assertThat(currentState.set(State.DISABLED)).isTrue(); 43 assertThat(currentState.getInternal()).isEqualTo(State.DISABLED); 44 assertThat(currentState.set(State.ENABLED)).isTrue(); 45 assertThat(currentState.getInternal()).isEqualTo(State.ENABLED); 46 assertThat(currentState.set(State.ENABLED)).isFalse(); 47 } 48 49 @Test 50 public void preventSettingStateAfterReadingState() { 51 CurrentState currentState = new CurrentState(State.ENABLED); 52 currentState.get(); 53 thrown.expect(IllegalStateException.class); 54 thrown.expectMessage("State was already read, cannot set state."); 55 currentState.set(State.DISABLED); 56 } 57 } 58
