1 files changed, 220 insertions, 0 deletions
diff --git a/api/src/test/java/io/opencensus/metrics/MetricRegistryTest.java b/api/src/test/java/io/opencensus/metrics/MetricRegistryTest.java
new file mode 100644
index 00000000..d8a26cc8
--- /dev/null
+++ b/api/src/test/java/io/opencensus/metrics/MetricRegistryTest.java
@@ -0,0 +1,220 @@
+/*
+ * 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.metrics;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.util.Collections;
+import java.util.List;
+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 MetricRegistry}. */
+@RunWith(JUnit4.class)
+public class MetricRegistryTest {
+  @Rule public ExpectedException thrown = ExpectedException.none();
+
+  private static final String NAME = "name";
+  private static final String NAME_2 = "name2";
+  private static final String NAME_3 = "name3";
+  private static final String NAME_4 = "name4";
+  private static final String DESCRIPTION = "description";
+  private static final String UNIT = "1";
+  private static final List<LabelKey> LABEL_KEY =
+      Collections.singletonList(LabelKey.create("key", "key description"));
+  private static final List<LabelValue> LABEL_VALUES =
+      Collections.singletonList(LabelValue.create("value"));
+  private final MetricRegistry metricRegistry =
+      MetricsComponent.newNoopMetricsComponent().getMetricRegistry();
+
+  @Test
+  public void noopAddLongGauge_NullName() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("name");
+    metricRegistry.addLongGauge(null, DESCRIPTION, UNIT, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddLongGauge_NullDescription() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("description");
+    metricRegistry.addLongGauge(NAME, null, UNIT, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddLongGauge_NullUnit() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("unit");
+    metricRegistry.addLongGauge(NAME, DESCRIPTION, null, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddLongGauge_NullLabels() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("labelKeys");
+    metricRegistry.addLongGauge(NAME, DESCRIPTION, UNIT, null);
+  }
+
+  @Test
+  public void noopAddLongGauge_WithNullElement() {
+    List<LabelKey> labelKeys = Collections.singletonList(null);
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("labelKey element should not be null.");
+    metricRegistry.addLongGauge(NAME, DESCRIPTION, UNIT, labelKeys);
+  }
+
+  @Test
+  public void noopAddDoubleGauge_NullName() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("name");
+    metricRegistry.addDoubleGauge(null, DESCRIPTION, UNIT, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDoubleGauge_NullDescription() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("description");
+    metricRegistry.addDoubleGauge(NAME_2, null, UNIT, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDoubleGauge_NullUnit() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("unit");
+    metricRegistry.addDoubleGauge(NAME_2, DESCRIPTION, null, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDoubleGauge_NullLabels() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("labelKeys");
+    metricRegistry.addDoubleGauge(NAME_2, DESCRIPTION, UNIT, null);
+  }
+
+  @Test
+  public void noopAddDoubleGauge_WithNullElement() {
+    List<LabelKey> labelKeys = Collections.singletonList(null);
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("labelKey element should not be null.");
+    metricRegistry.addDoubleGauge(NAME_2, DESCRIPTION, UNIT, labelKeys);
+  }
+
+  @Test
+  public void noopAddDerivedLongGauge_NullName() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("name");
+    metricRegistry.addDerivedLongGauge(null, DESCRIPTION, UNIT, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDerivedLongGauge_NullDescription() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("description");
+    metricRegistry.addDerivedLongGauge(NAME_3, null, UNIT, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDerivedLongGauge_NullUnit() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("unit");
+    metricRegistry.addDerivedLongGauge(NAME_3, DESCRIPTION, null, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDerivedLongGauge_NullLabels() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("labelKeys");
+    metricRegistry.addDerivedLongGauge(NAME_3, DESCRIPTION, UNIT, null);
+  }
+
+  @Test
+  public void noopAddDerivedLongGauge_WithNullElement() {
+    List<LabelKey> labelKeys = Collections.singletonList(null);
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("labelKey element should not be null.");
+    metricRegistry.addDerivedLongGauge(NAME_3, DESCRIPTION, UNIT, labelKeys);
+  }
+
+  @Test
+  public void noopAddDerivedDoubleGauge_NullName() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("name");
+    metricRegistry.addDerivedDoubleGauge(null, DESCRIPTION, UNIT, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDerivedDoubleGauge_NullDescription() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("description");
+    metricRegistry.addDerivedDoubleGauge(NAME_4, null, UNIT, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDerivedDoubleGauge_NullUnit() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("unit");
+    metricRegistry.addDerivedDoubleGauge(NAME_4, DESCRIPTION, null, LABEL_KEY);
+  }
+
+  @Test
+  public void noopAddDerivedDoubleGauge_NullLabels() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("labelKeys");
+    metricRegistry.addDerivedDoubleGauge(NAME_4, DESCRIPTION, UNIT, null);
+  }
+
+  @Test
+  public void noopAddDerivedDoubleGauge_WithNullElement() {
+    List<LabelKey> labelKeys = Collections.singletonList(null);
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage("labelKey element should not be null.");
+    metricRegistry.addDerivedDoubleGauge(NAME_4, DESCRIPTION, UNIT, labelKeys);
+  }
+
+  @Test
+  public void noopSameAs() {
+    LongGauge longGauge = metricRegistry.addLongGauge(NAME, DESCRIPTION, UNIT, LABEL_KEY);
+    assertThat(longGauge.getDefaultTimeSeries()).isSameAs(longGauge.getDefaultTimeSeries());
+    assertThat(longGauge.getDefaultTimeSeries())
+        .isSameAs(longGauge.getOrCreateTimeSeries(LABEL_VALUES));
+
+    DoubleGauge doubleGauge = metricRegistry.addDoubleGauge(NAME_2, DESCRIPTION, UNIT, LABEL_KEY);
+    assertThat(doubleGauge.getDefaultTimeSeries()).isSameAs(doubleGauge.getDefaultTimeSeries());
+    assertThat(doubleGauge.getDefaultTimeSeries())
+        .isSameAs(doubleGauge.getOrCreateTimeSeries(LABEL_VALUES));
+  }
+
+  @Test
+  public void noopInstanceOf() {
+    assertThat(metricRegistry.addLongGauge(NAME, DESCRIPTION, UNIT, LABEL_KEY))
+        .isInstanceOf(LongGauge.newNoopLongGauge(NAME, DESCRIPTION, UNIT, LABEL_KEY).getClass());
+    assertThat(metricRegistry.addDoubleGauge(NAME_2, DESCRIPTION, UNIT, LABEL_KEY))
+        .isInstanceOf(
+            DoubleGauge.newNoopDoubleGauge(NAME_2, DESCRIPTION, UNIT, LABEL_KEY).getClass());
+    assertThat(metricRegistry.addDerivedLongGauge(NAME_3, DESCRIPTION, UNIT, LABEL_KEY))
+        .isInstanceOf(
+            DerivedLongGauge.newNoopDerivedLongGauge(NAME_3, DESCRIPTION, UNIT, LABEL_KEY)
+                .getClass());
+    assertThat(metricRegistry.addDerivedDoubleGauge(NAME_4, DESCRIPTION, UNIT, LABEL_KEY))
+        .isInstanceOf(
+            DerivedDoubleGauge.newNoopDerivedDoubleGauge(NAME_4, DESCRIPTION, UNIT, LABEL_KEY)
+                .getClass());
+  }
+}