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/*
* 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.common.Timestamp;
import io.opencensus.metrics.export.Distribution.Bucket;
import io.opencensus.metrics.export.Distribution.Exemplar;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
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 Distribution}. */
@RunWith(JUnit4.class)
public class DistributionTest {
@Rule public final ExpectedException thrown = ExpectedException.none();
private static final Timestamp TIMESTAMP = Timestamp.create(1, 0);
private static final Map<String, String> ATTACHMENTS = Collections.singletonMap("key", "value");
private static final double TOLERANCE = 1e-6;
@Test
public void createAndGet_Bucket() {
Bucket bucket = Bucket.create(98);
assertThat(bucket.getCount()).isEqualTo(98);
assertThat(bucket.getExemplar()).isNull();
}
@Test
public void createAndGet_BucketWithExemplar() {
Exemplar exemplar = Exemplar.create(12.2, TIMESTAMP, ATTACHMENTS);
Bucket bucket = Bucket.create(7, exemplar);
assertThat(bucket.getCount()).isEqualTo(7);
assertThat(bucket.getExemplar()).isEqualTo(exemplar);
}
@Test
public void createBucket_preventNullExemplar() {
thrown.expect(NullPointerException.class);
thrown.expectMessage("exemplar");
Bucket.create(1, null);
}
@Test
public void createAndGet_Exemplar() {
Exemplar exemplar = Exemplar.create(-9.9, TIMESTAMP, ATTACHMENTS);
assertThat(exemplar.getValue()).isWithin(TOLERANCE).of(-9.9);
assertThat(exemplar.getTimestamp()).isEqualTo(TIMESTAMP);
assertThat(exemplar.getAttachments()).isEqualTo(ATTACHMENTS);
}
@Test
public void createAndGet_Distribution() {
Exemplar exemplar = Exemplar.create(15.0, TIMESTAMP, ATTACHMENTS);
List<Double> bucketBounds = Arrays.asList(-1.0, 0.0, 1.0);
List<Bucket> buckets =
Arrays.asList(
Bucket.create(3), Bucket.create(1), Bucket.create(2), Bucket.create(4, exemplar));
Distribution distribution = Distribution.create(10, 6.6, 678.54, bucketBounds, buckets);
assertThat(distribution.getCount()).isEqualTo(10);
assertThat(distribution.getSum()).isWithin(TOLERANCE).of(6.6);
assertThat(distribution.getSumOfSquaredDeviations()).isWithin(TOLERANCE).of(678.54);
assertThat(distribution.getBucketBoundaries())
.containsExactlyElementsIn(bucketBounds)
.inOrder();
assertThat(distribution.getBuckets()).containsExactlyElementsIn(buckets).inOrder();
}
@Test
public void createBucket_NegativeCount() {
thrown.expect(IllegalArgumentException.class);
thrown.expectMessage("bucket count should be non-negative.");
Bucket.create(-5);
}
@Test
public void createExemplar_PreventNullAttachments() {
thrown.expect(NullPointerException.class);
thrown.expectMessage("attachments");
Exemplar.create(15, TIMESTAMP, null);
}
@Test
public void createExemplar_PreventNullAttachmentKey() {
Map<String, String> attachments = Collections.singletonMap(null, "value");
thrown.expect(NullPointerException.class);
thrown.expectMessage("key of attachment");
Exemplar.create(15, TIMESTAMP, attachments);
}
@Test
public void createExemplar_PreventNullAttachmentValue() {
Map<String, String> attachments = Collections.singletonMap("key", null);
thrown.expect(NullPointerException.class);
thrown.expectMessage("value of attachment");
Exemplar.create(15, TIMESTAMP, attachments);
}
@Test
public void createDistribution_NegativeCount() {
List<Double> bucketBounds = Arrays.asList(-1.0, 0.0, 1.0);
List<Bucket> buckets =
Arrays.asList(Bucket.create(3), Bucket.create(1), Bucket.create(2), Bucket.create(4));
thrown.expect(IllegalArgumentException.class);
thrown.expectMessage("count should be non-negative.");
Distribution.create(-10, 6.6, 678.54, bucketBounds, buckets);
}
@Test
public void createDistribution_NegativeSumOfSquaredDeviations() {
List<Double> bucketBounds = Arrays.asList(-1.0, 0.0, 1.0);
List<Bucket> buckets =
Arrays.asList(Bucket.create(0), Bucket.create(0), Bucket.create(0), Bucket.create(0));
thrown.expect(IllegalArgumentException.class);
thrown.expectMessage("sum of squared deviations should be non-negative.");
Distribution.create(0, 6.6, -678.54, bucketBounds, buckets);
}
@Test
public void createDistribution_ZeroCountAndPositiveMean() {
List<Double> bucketBounds = Arrays.asList(-1.0, 0.0, 1.0);
List<Bucket> buckets =
Arrays.asList(Bucket.create(0), Bucket.create(0), Bucket.create(0), Bucket.create(0));
thrown.expect(IllegalArgumentException.class);
thrown.expectMessage("sum should be 0 if count is 0.");
Distribution.create(0, 6.6, 0, bucketBounds, buckets);
}
@Test
public void createDistribution_ZeroCountAndSumOfSquaredDeviations() {
List<Double> bucketBounds = Arrays.asList(-1.0, 0.0, 1.0);
List<Bucket> buckets =
Arrays.asList(Bucket.create(0), Bucket.create(0), Bucket.create(0), Bucket.create(0));
thrown.expect(IllegalArgumentException.class);
thrown.expectMessage("sum of squared deviations should be 0 if count is 0.");
Distribution.create(0, 0, 678.54, bucketBounds, buckets);
}
@Test
public void createDistribution_NullBucketBounds() {
List<Bucket> buckets =
Arrays.asList(Bucket.create(3), Bucket.create(1), Bucket.create(2), Bucket.create(4));
thrown.expect(NullPointerException.class);
thrown.expectMessage("bucketBoundaries list should not be null.");
Distribution.create(10, 6.6, 678.54, null, buckets);
}
@Test
public void createDistribution_UnorderedBucketBounds() {
List<Double> bucketBounds = Arrays.asList(0.0, -1.0, 1.0);
List<Bucket> buckets =
Arrays.asList(Bucket.create(3), Bucket.create(1), Bucket.create(2), Bucket.create(4));
thrown.expect(IllegalArgumentException.class);
thrown.expectMessage("bucket boundaries not sorted.");
Distribution.create(10, 6.6, 678.54, bucketBounds, buckets);
}
@Test
public void createDistribution_NullBucketList() {
List<Double> bucketBounds = Arrays.asList(-1.0, 0.0, 1.0);
thrown.expect(NullPointerException.class);
thrown.expectMessage("bucket list should not be null.");
Distribution.create(10, 6.6, 678.54, bucketBounds, null);
}
@Test
public void createDistribution_NullBucket() {
List<Double> bucketBounds = Arrays.asList(-1.0, 0.0, 1.0);
List<Bucket> buckets =
Arrays.asList(Bucket.create(3), Bucket.create(1), null, Bucket.create(4));
thrown.expect(NullPointerException.class);
thrown.expectMessage("bucket should not be null.");
Distribution.create(10, 6.6, 678.54, bucketBounds, buckets);
}
@Test
public void testEquals() {
new EqualsTester()
.addEqualityGroup(
Distribution.create(
10,
10,
1,
Arrays.asList(-5.0, 0.0, 5.0),
Arrays.asList(
Bucket.create(3), Bucket.create(1), Bucket.create(2), Bucket.create(4))),
Distribution.create(
10,
10,
1,
Arrays.asList(-5.0, 0.0, 5.0),
Arrays.asList(
Bucket.create(3), Bucket.create(1), Bucket.create(2), Bucket.create(4))))
.addEqualityGroup(
Distribution.create(
7,
10,
23.456,
Arrays.asList(-5.0, 0.0, 5.0),
Arrays.asList(
Bucket.create(3), Bucket.create(1), Bucket.create(2), Bucket.create(4))))
.testEquals();
}
}
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