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A Fibonacci fitter is useful in situations where you want more precision on the low end than an ExponentialFitter with exponent base 2 provides without the hassle of dealing with non-integer boundaries, such as would be created by an exponential fitter with a base of less than 2. Fibonacci fitters are ideal for integer metrics that are bounded across a certain range, e.g. integers between 1 and 1,000. This also cleans up some unit test comments. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=156773367
83 lines
2.7 KiB
Java
83 lines
2.7 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.monitoring.metrics;
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import static com.google.common.truth.Truth.assertThat;
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import static org.junit.Assert.fail;
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import com.google.common.collect.ImmutableList;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.junit.runners.JUnit4;
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/** Unit tests for {@link FibonacciFitter}. */
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@RunWith(JUnit4.class)
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public class FibonacciFitterTest {
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@Test
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public void testCreate_maxBucketSizeNegative_throwsException() {
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try {
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FibonacciFitter.create(-1);
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fail("Expected exception");
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} catch (IllegalArgumentException e) {
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assertThat(e).hasMessageThat().isEqualTo("maxBucketSize must be greater than 0");
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}
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}
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@Test
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public void testCreate_maxBucketSizeZero_throwsException() {
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try {
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FibonacciFitter.create(0);
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fail("Expected exception");
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} catch (IllegalArgumentException e) {
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assertThat(e).hasMessageThat().isEqualTo("maxBucketSize must be greater than 0");
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}
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}
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@Test
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public void testCreate_maxBucketSizeOne_createsTwoBoundaries() {
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assertThat(FibonacciFitter.create(1).boundaries()).containsExactly(0.0, 1.0).inOrder();
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}
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@Test
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public void testCreate_maxBucketSizeTwo_createsThreeBoundaries() {
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assertThat(FibonacciFitter.create(2).boundaries()).containsExactly(0.0, 1.0, 2.0).inOrder();
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}
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@Test
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public void testCreate_maxBucketSizeThree_createsFourBoundaries() {
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assertThat(FibonacciFitter.create(3).boundaries())
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.containsExactly(0.0, 1.0, 2.0, 3.0)
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.inOrder();
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}
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@Test
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public void testCreate_maxBucketSizeFour_createsFourBoundaries() {
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assertThat(FibonacciFitter.create(4).boundaries())
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.containsExactly(0.0, 1.0, 2.0, 3.0)
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.inOrder();
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}
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@Test
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public void testCreate_maxBucketSizeLarge_createsFibonacciSequenceBoundaries() {
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ImmutableList<Double> expectedBoundaries =
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ImmutableList.of(
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0.0, 1.0, 2.0, 3.0, 5.0, 8.0, 13.0, 21.0, 34.0, 55.0, 89.0, 144.0, 233.0, 377.0, 610.0,
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987.0);
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assertThat(FibonacciFitter.create(1000).boundaries())
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.containsExactlyElementsIn(expectedBoundaries)
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.inOrder();
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}
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}
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