Add more tests to external code repo

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=131406104

javatests/google/registry/monitoring/metrics/MetricReporterTest.java

@@ -0,0 +1,70 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// 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 google.registry.monitoring.metrics;
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ThreadFactory;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InOrder;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.runners.MockitoJUnitRunner;
+
+/** Unit tests for {@link MetricReporter}. */
+@RunWith(MockitoJUnitRunner.class)
+public class MetricReporterTest {
+
+  @Mock MetricRegistry registry;
+  @Mock Metric<?> metric;
+  @Mock ThreadFactory threadFactory;
+  @Mock MetricWriter writer;
+  @Mock MetricSchema metricSchema;
+  @Mock BlockingQueue<Optional<ImmutableList<MetricPoint<?>>>> writeQueue;
+
+  @Test
+  public void testRunOneIteration_enqueuesBatch() throws Exception {
+    Metric<?> metric =
+        new Counter("/name", "description", "vdn", ImmutableSet.<LabelDescriptor>of());
+    when(registry.getRegisteredMetrics()).thenReturn(ImmutableList.of(metric, metric));
+    MetricReporter reporter = new MetricReporter(writer, 10L, threadFactory, registry, writeQueue);
+
+    reporter.runOneIteration();
+
+    verify(writeQueue).offer(Optional.of(ImmutableList.<MetricPoint<?>>of()));
+  }
+
+  @Test
+  public void testShutDown_enqueuesBatchAndPoisonPill() throws Exception {
+    // Set up a registry with no metrics.
+    when(registry.getRegisteredMetrics()).thenReturn(ImmutableList.<Metric<?>>of());
+    MetricReporter reporter =
+        spy(new MetricReporter(writer, 10L, threadFactory, registry, writeQueue));
+
+    reporter.shutDown();
+
+    verify(reporter).runOneIteration();
+    InOrder interactions = Mockito.inOrder(writeQueue);
+    interactions.verify(writeQueue).offer(Optional.of(ImmutableList.<MetricPoint<?>>of()));
+    interactions.verify(writeQueue).offer(Optional.<ImmutableList<MetricPoint<?>>>absent());
+  }
+}