| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.beam.sdk.extensions.sql.impl.transform.agg; |
| |
| import static java.math.BigDecimal.ZERO; |
| import static org.apache.beam.sdk.extensions.sql.impl.transform.agg.VarianceAccumulator.newVarianceAccumulator; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNotNull; |
| |
| import java.math.BigDecimal; |
| import java.util.Arrays; |
| import org.apache.beam.sdk.coders.CoderRegistry; |
| import org.apache.beam.sdk.coders.VarIntCoder; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.Parameterized; |
| import org.junit.runners.Parameterized.Parameters; |
| |
| /** Unit tests for {@link VarianceFnTest}. */ |
| @RunWith(Parameterized.class) |
| public class VarianceFnTest { |
| private static final BigDecimal FIFTEEN = new BigDecimal(15); |
| private static final BigDecimal THREE = new BigDecimal(3); |
| private static final BigDecimal FOUR = new BigDecimal(4); |
| |
| @Parameters(name = "varianceFn {index}") |
| public static Iterable<Object[]> varianceFns() { |
| return Arrays.asList( |
| new Object[][] { |
| { |
| VarianceFn.newPopulation(BigDecimal::intValue), |
| newVarianceAccumulator(FIFTEEN, THREE, ZERO), |
| 5 |
| }, |
| { |
| VarianceFn.newSample(BigDecimal::intValue), |
| newVarianceAccumulator(FIFTEEN, FOUR, ZERO), |
| 5 |
| } |
| }); |
| } |
| |
| private VarianceFn varianceFn; |
| private VarianceAccumulator testAccumulatorInput; |
| private int expectedExtractedResult; |
| |
| public VarianceFnTest( |
| VarianceFn varianceFn, |
| VarianceAccumulator testAccumulatorInput, |
| int expectedExtractedResult) { |
| |
| this.varianceFn = varianceFn; |
| this.testAccumulatorInput = testAccumulatorInput; |
| this.expectedExtractedResult = expectedExtractedResult; |
| } |
| |
| @Test |
| public void testCreatesEmptyAccumulator() { |
| assertEquals(VarianceAccumulator.EMPTY, varianceFn.createAccumulator()); |
| } |
| |
| @Test |
| public void testReturnsAccumulatorUnchangedForNullInput() { |
| VarianceAccumulator accumulator = newVarianceAccumulator(ZERO, BigDecimal.ONE, BigDecimal.TEN); |
| |
| assertEquals(accumulator, varianceFn.addInput(accumulator, null)); |
| } |
| |
| @Test |
| public void testAddsInputToAccumulator() { |
| VarianceAccumulator expectedAccumulator = |
| newVarianceAccumulator(ZERO, BigDecimal.ONE, new BigDecimal(2)); |
| |
| assertEquals( |
| expectedAccumulator, |
| varianceFn.addInput(varianceFn.createAccumulator(), new BigDecimal(2))); |
| } |
| |
| @Test |
| public void testCeatesAccumulatorCoder() { |
| assertNotNull(varianceFn.getAccumulatorCoder(CoderRegistry.createDefault(), VarIntCoder.of())); |
| } |
| |
| @Test |
| public void testReturnsOutput() { |
| assertEquals(expectedExtractedResult, varianceFn.extractOutput(testAccumulatorInput)); |
| } |
| } |