1 files changed, 103 insertions, 0 deletions
diff --git a/api/src/test/java/io/opencensus/metrics/export/MetricDescriptorTest.java b/api/src/test/java/io/opencensus/metrics/export/MetricDescriptorTest.java
new file mode 100644
index 00000000..502170c6
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+++ b/api/src/test/java/io/opencensus/metrics/export/MetricDescriptorTest.java
@@ -0,0 +1,103 @@
+/*
+ * 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.export;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.testing.EqualsTester;
+import io.opencensus.metrics.LabelKey;
+import io.opencensus.metrics.export.MetricDescriptor.Type;
+import java.util.Arrays;
+import java.util.List;
+import org.hamcrest.CoreMatchers;
+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 MetricDescriptor}. */
+@RunWith(JUnit4.class)
+public class MetricDescriptorTest {
+
+  @Rule public final ExpectedException thrown = ExpectedException.none();
+
+  private static final String METRIC_NAME_1 = "metric1";
+  private static final String METRIC_NAME_2 = "metric2";
+  private static final String DESCRIPTION = "Metric description.";
+  private static final String UNIT = "kb/s";
+  private static final LabelKey KEY_1 = LabelKey.create("key1", "some key");
+  private static final LabelKey KEY_2 = LabelKey.create("key2", "some other key");
+
+  @Test
+  public void testGet() {
+    MetricDescriptor metricDescriptor =
+        MetricDescriptor.create(
+            METRIC_NAME_1, DESCRIPTION, UNIT, Type.GAUGE_DOUBLE, Arrays.asList(KEY_1, KEY_2));
+    assertThat(metricDescriptor.getName()).isEqualTo(METRIC_NAME_1);
+    assertThat(metricDescriptor.getDescription()).isEqualTo(DESCRIPTION);
+    assertThat(metricDescriptor.getUnit()).isEqualTo(UNIT);
+    assertThat(metricDescriptor.getType()).isEqualTo(Type.GAUGE_DOUBLE);
+    assertThat(metricDescriptor.getLabelKeys()).containsExactly(KEY_1, KEY_2).inOrder();
+  }
+
+  @Test
+  public void preventNullLabelKeyList() {
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage(CoreMatchers.equalTo("labelKeys"));
+    MetricDescriptor.create(METRIC_NAME_1, DESCRIPTION, UNIT, Type.GAUGE_DOUBLE, null);
+  }
+
+  @Test
+  public void preventNullLabelKey() {
+    List<LabelKey> keys = Arrays.asList(KEY_1, null);
+    thrown.expect(NullPointerException.class);
+    thrown.expectMessage(CoreMatchers.equalTo("labelKey"));
+    MetricDescriptor.create(METRIC_NAME_1, DESCRIPTION, UNIT, Type.GAUGE_DOUBLE, keys);
+  }
+
+  @Test
+  public void testEquals() {
+    new EqualsTester()
+        .addEqualityGroup(
+            MetricDescriptor.create(
+                METRIC_NAME_1, DESCRIPTION, UNIT, Type.GAUGE_DOUBLE, Arrays.asList(KEY_1, KEY_2)),
+            MetricDescriptor.create(
+                METRIC_NAME_1, DESCRIPTION, UNIT, Type.GAUGE_DOUBLE, Arrays.asList(KEY_1, KEY_2)))
+        .addEqualityGroup(
+            MetricDescriptor.create(
+                METRIC_NAME_2, DESCRIPTION, UNIT, Type.GAUGE_DOUBLE, Arrays.asList(KEY_1, KEY_2)))
+        .addEqualityGroup(
+            MetricDescriptor.create(
+                METRIC_NAME_2, DESCRIPTION, UNIT, Type.GAUGE_INT64, Arrays.asList(KEY_1, KEY_2)))
+        .addEqualityGroup(
+            MetricDescriptor.create(
+                METRIC_NAME_1,
+                DESCRIPTION,
+                UNIT,
+                Type.CUMULATIVE_DISTRIBUTION,
+                Arrays.asList(KEY_1, KEY_2)))
+        .addEqualityGroup(
+            MetricDescriptor.create(
+                METRIC_NAME_1,
+                DESCRIPTION,
+                UNIT,
+                Type.CUMULATIVE_DISTRIBUTION,
+                Arrays.asList(KEY_1)))
+        .testEquals();
+  }
+}