1 files changed, 87 insertions, 0 deletions
diff --git a/api/src/test/java/io/opencensus/stats/BucketBoundariesTest.java b/api/src/test/java/io/opencensus/stats/BucketBoundariesTest.java
new file mode 100644
index 00000000..36f2edb4
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+++ b/api/src/test/java/io/opencensus/stats/BucketBoundariesTest.java
@@ -0,0 +1,87 @@
+/*
+ * 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.stats;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.testing.EqualsTester;
+import java.util.ArrayList;
+import java.util.Arrays;
+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 io.opencensus.stats.BucketBoundaries}. */
+@RunWith(JUnit4.class)
+public class BucketBoundariesTest {
+
+  @Rule public final ExpectedException thrown = ExpectedException.none();
+
+  @Test
+  public void testConstructBoundaries() {
+    List<Double> buckets = Arrays.asList(0.0, 1.0, 2.0);
+    BucketBoundaries bucketBoundaries = BucketBoundaries.create(buckets);
+    assertThat(bucketBoundaries.getBoundaries()).isEqualTo(buckets);
+  }
+
+  @Test
+  public void testBoundariesDoesNotChangeWithOriginalList() {
+    List<Double> original = new ArrayList<Double>();
+    original.add(0.0);
+    original.add(1.0);
+    original.add(2.0);
+    BucketBoundaries bucketBoundaries = BucketBoundaries.create(original);
+    original.set(2, 3.0);
+    original.add(4.0);
+    List<Double> expected = Arrays.asList(0.0, 1.0, 2.0);
+    assertThat(bucketBoundaries.getBoundaries()).isNotEqualTo(original);
+    assertThat(bucketBoundaries.getBoundaries()).isEqualTo(expected);
+  }
+
+  @Test
+  public void testNullBoundaries() throws Exception {
+    thrown.expect(NullPointerException.class);
+    BucketBoundaries.create(null);
+  }
+
+  @Test
+  public void testUnsortedBoundaries() throws Exception {
+    List<Double> buckets = Arrays.asList(0.0, 1.0, 1.0);
+    thrown.expect(IllegalArgumentException.class);
+    BucketBoundaries.create(buckets);
+  }
+
+  @Test
+  public void testNoBoundaries() {
+    List<Double> buckets = Arrays.asList();
+    BucketBoundaries bucketBoundaries = BucketBoundaries.create(buckets);
+    assertThat(bucketBoundaries.getBoundaries()).isEqualTo(buckets);
+  }
+
+  @Test
+  public void testBucketBoundariesEquals() {
+    new EqualsTester()
+        .addEqualityGroup(
+            BucketBoundaries.create(Arrays.asList(-1.0, 2.0)),
+            BucketBoundaries.create(Arrays.asList(-1.0, 2.0)))
+        .addEqualityGroup(BucketBoundaries.create(Arrays.asList(-1.0)))
+        .testEquals();
+  }
+}