1 files changed, 120 insertions, 0 deletions
diff --git a/impl_core/src/test/java/io/opencensus/implcore/stats/IntervalBucketTest.java b/impl_core/src/test/java/io/opencensus/implcore/stats/IntervalBucketTest.java
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+++ b/impl_core/src/test/java/io/opencensus/implcore/stats/IntervalBucketTest.java
@@ -0,0 +1,120 @@
+/*
+ * 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.implcore.stats;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import io.opencensus.common.Duration;
+import io.opencensus.common.Timestamp;
+import io.opencensus.implcore.stats.MutableAggregation.MutableMean;
+import io.opencensus.stats.Aggregation.Mean;
+import io.opencensus.tags.TagValue;
+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;
+
+/** Tests for {@link IntervalBucket}. */
+@RunWith(JUnit4.class)
+public class IntervalBucketTest {
+
+  @Rule public final ExpectedException thrown = ExpectedException.none();
+
+  private static final double TOLERANCE = 1e-6;
+  private static final Duration MINUTE = Duration.create(60, 0);
+  private static final Duration NEGATIVE_TEN_SEC = Duration.create(-10, 0);
+  private static final Timestamp START = Timestamp.create(60, 0);
+  private static final Mean MEAN = Mean.create();
+
+  @Test
+  public void preventNullStartTime() {
+    thrown.expect(NullPointerException.class);
+    new IntervalBucket(null, MINUTE, MEAN);
+  }
+
+  @Test
+  public void preventNullDuration() {
+    thrown.expect(NullPointerException.class);
+    new IntervalBucket(START, null, MEAN);
+  }
+
+  @Test
+  public void preventNegativeDuration() {
+    thrown.expect(IllegalArgumentException.class);
+    new IntervalBucket(START, NEGATIVE_TEN_SEC, MEAN);
+  }
+
+  @Test
+  public void preventNullAggregationList() {
+    thrown.expect(NullPointerException.class);
+    new IntervalBucket(START, MINUTE, null);
+  }
+
+  @Test
+  public void testGetTagValueAggregationMap_empty() {
+    assertThat(new IntervalBucket(START, MINUTE, MEAN).getTagValueAggregationMap()).isEmpty();
+  }
+
+  @Test
+  public void testGetStart() {
+    assertThat(new IntervalBucket(START, MINUTE, MEAN).getStart()).isEqualTo(START);
+  }
+
+  @Test
+  public void testRecord() {
+    IntervalBucket bucket = new IntervalBucket(START, MINUTE, MEAN);
+    List<TagValue> tagValues1 = Arrays.<TagValue>asList(TagValue.create("VALUE1"));
+    List<TagValue> tagValues2 = Arrays.<TagValue>asList(TagValue.create("VALUE2"));
+    bucket.record(tagValues1, 5.0);
+    bucket.record(tagValues1, 15.0);
+    bucket.record(tagValues2, 10.0);
+    assertThat(bucket.getTagValueAggregationMap().keySet()).containsExactly(tagValues1, tagValues2);
+    MutableMean mutableMean1 = (MutableMean) bucket.getTagValueAggregationMap().get(tagValues1);
+    MutableMean mutableMean2 = (MutableMean) bucket.getTagValueAggregationMap().get(tagValues2);
+    assertThat(mutableMean1.getSum()).isWithin(TOLERANCE).of(20);
+    assertThat(mutableMean2.getSum()).isWithin(TOLERANCE).of(10);
+    assertThat(mutableMean1.getCount()).isEqualTo(2);
+    assertThat(mutableMean2.getCount()).isEqualTo(1);
+  }
+
+  @Test
+  public void testGetFraction() {
+    Timestamp thirtySecondsAfterStart = Timestamp.create(90, 0);
+    assertThat(new IntervalBucket(START, MINUTE, MEAN).getFraction(thirtySecondsAfterStart))
+        .isWithin(TOLERANCE)
+        .of(0.5);
+  }
+
+  @Test
+  public void preventCallingGetFractionOnPastBuckets() {
+    IntervalBucket bucket = new IntervalBucket(START, MINUTE, MEAN);
+    Timestamp twoMinutesAfterStart = Timestamp.create(180, 0);
+    thrown.expect(IllegalArgumentException.class);
+    bucket.getFraction(twoMinutesAfterStart);
+  }
+
+  @Test
+  public void preventCallingGetFractionOnFutureBuckets() {
+    IntervalBucket bucket = new IntervalBucket(START, MINUTE, MEAN);
+    Timestamp thirtySecondsBeforeStart = Timestamp.create(30, 0);
+    thrown.expect(IllegalArgumentException.class);
+    bucket.getFraction(thirtySecondsBeforeStart);
+  }
+}