1 files changed, 55 insertions, 0 deletions
diff --git a/api/src/test/java/io/opencensus/trace/export/NoopRunningSpanStoreTest.java b/api/src/test/java/io/opencensus/trace/export/NoopRunningSpanStoreTest.java
new file mode 100644
index 00000000..960da27c
--- /dev/null
+++ b/api/src/test/java/io/opencensus/trace/export/NoopRunningSpanStoreTest.java
@@ -0,0 +1,55 @@
+/*
+ * 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.trace.export;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.util.Collection;
+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 NoopRunningSpanStore}. */
+@RunWith(JUnit4.class)
+public final class NoopRunningSpanStoreTest {
+
+  private final RunningSpanStore runningSpanStore =
+      ExportComponent.newNoopExportComponent().getRunningSpanStore();
+
+  @Rule public final ExpectedException thrown = ExpectedException.none();
+
+  @Test
+  public void noopRunningSpanStore_GetSummary() {
+    RunningSpanStore.Summary summary = runningSpanStore.getSummary();
+    assertThat(summary.getPerSpanNameSummary()).isEmpty();
+  }
+
+  @Test
+  public void noopRunningSpanStore_GetRunningSpans_DisallowsNull() {
+    thrown.expect(NullPointerException.class);
+    runningSpanStore.getRunningSpans(null);
+  }
+
+  @Test
+  public void noopRunningSpanStore_GetRunningSpans() {
+    Collection<SpanData> runningSpans =
+        runningSpanStore.getRunningSpans(RunningSpanStore.Filter.create("TestSpan", 0));
+    assertThat(runningSpans).isEmpty();
+  }
+}