1 files changed, 77 insertions, 0 deletions
diff --git a/impl_core/src/test/java/io/opencensus/implcore/stats/StatsComponentImplBaseTest.java b/impl_core/src/test/java/io/opencensus/implcore/stats/StatsComponentImplBaseTest.java
new file mode 100644
index 00000000..04861df9
--- /dev/null
+++ b/impl_core/src/test/java/io/opencensus/implcore/stats/StatsComponentImplBaseTest.java
@@ -0,0 +1,77 @@
+/*
+ * 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.implcore.internal.SimpleEventQueue;
+import io.opencensus.stats.StatsCollectionState;
+import io.opencensus.stats.StatsComponent;
+import io.opencensus.testing.common.TestClock;
+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 StatsComponentImplBase}. */
+@RunWith(JUnit4.class)
+public final class StatsComponentImplBaseTest {
+
+  @Rule public final ExpectedException thrown = ExpectedException.none();
+
+  private final StatsComponent statsComponent =
+      new StatsComponentImplBase(new SimpleEventQueue(), TestClock.create());
+
+  @Test
+  public void defaultState() {
+    assertThat(statsComponent.getState()).isEqualTo(StatsCollectionState.ENABLED);
+  }
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void setState_Disabled() {
+    statsComponent.setState(StatsCollectionState.DISABLED);
+    assertThat(statsComponent.getState()).isEqualTo(StatsCollectionState.DISABLED);
+  }
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void setState_Enabled() {
+    statsComponent.setState(StatsCollectionState.DISABLED);
+    statsComponent.setState(StatsCollectionState.ENABLED);
+    assertThat(statsComponent.getState()).isEqualTo(StatsCollectionState.ENABLED);
+  }
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void setState_DisallowsNull() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("newState");
+    statsComponent.setState(null);
+  }
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void preventSettingStateAfterGettingState() {
+    statsComponent.setState(StatsCollectionState.DISABLED);
+    statsComponent.getState();
+    thrown.expect(IllegalStateException.class);
+    thrown.expectMessage("State was already read, cannot set state.");
+    statsComponent.setState(StatsCollectionState.ENABLED);
+  }
+}