Java tutorial
/* COPYRIGHT STATUS: Dec 1st 2001, Fermi National Accelerator Laboratory (FNAL) documents and software are sponsored by the U.S. Department of Energy under Contract No. DE-AC02-76CH03000. Therefore, the U.S. Government retains a world-wide non-exclusive, royalty-free license to publish or reproduce these documents and software for U.S. Government purposes. All documents and software available from this server are protected under the U.S. and Foreign Copyright Laws, and FNAL reserves all rights. Distribution of the software available from this server is free of charge subject to the user following the terms of the Fermitools Software Legal Information. Redistribution and/or modification of the software shall be accompanied by the Fermitools Software Legal Information (including the copyright notice). The user is asked to feed back problems, benefits, and/or suggestions about the software to the Fermilab Software Providers. 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Correspondingly, it is understood and agreed that the U.S. Government has no connection to this software and in no manner whatsoever shall be liable for nor assume any responsibility or obligation for any claim, cost, or damages arising out of or resulting from the use of the software available from this server. Export Control: All documents and software available from this server are subject to U.S. export control laws. Anyone downloading information from this server is obligated to secure any necessary Government licenses before exporting documents or software obtained from this server. */ package org.dcache.util.histograms; import org.apache.commons.math3.util.FastMath; import org.junit.Test; import java.util.ArrayList; import java.util.List; import java.util.concurrent.TimeUnit; import static junit.framework.TestCase.assertEquals; import static junit.framework.TestCase.assertNotNull; public final class CountingHistogramTest extends HistogramModelTest { @Test public void binUnitShouldBe1ForMaxValue50Days() throws Exception { givenCountingHistogram(); givenFilelifetimeValuesFor(50); givenBinCountOf(51); givenBinUnitOf((double) TimeUnit.DAYS.toMillis(1)); givenBinLabelOf(TimeUnit.DAYS.name()); givenDataLabelOf("COUNT"); givenHistogramTypeOf("File Lifetime Count"); whenConfigureIsCalled(); assertThatBuildSucceeded(); assertThatBinWidthIs(1); } @Test public void binUnitShouldBe2ForMaxValue100Days() throws Exception { givenCountingHistogram(); givenFilelifetimeValuesFor(100); givenBinCountOf(51); givenBinUnitOf((double) TimeUnit.DAYS.toMillis(1)); givenBinLabelOf(TimeUnit.DAYS.name()); givenDataLabelOf("COUNT"); givenHistogramTypeOf("File Lifetime Count"); whenConfigureIsCalled(); assertThatBuildSucceeded(); assertThatBinWidthIs(2); } @Test public void binUnitShouldBe3ForMaxValue101Days() throws Exception { givenCountingHistogram(); givenFilelifetimeValuesFor(101); givenBinCountOf(51); givenBinUnitOf((double) TimeUnit.DAYS.toMillis(1)); givenBinLabelOf(TimeUnit.DAYS.name()); givenDataLabelOf("COUNT"); givenHistogramTypeOf("File Lifetime Count"); whenConfigureIsCalled(); assertThatBuildSucceeded(); assertThatBinWidthIs(3); } @Test public void buildShouldFailWhenNoCountGivenToCounting() throws Exception { givenCountingHistogram(); givenFilelifetimeValuesFor(150); givenBinUnitOf((double) TimeUnit.DAYS.toMillis(1)); givenBinLabelOf(TimeUnit.DAYS.name()); givenDataLabelOf("COUNT"); givenHistogramTypeOf("File Lifetime Count"); whenConfigureIsCalled(); assertThatBuildFailed(); } @Test public void buildShouldFailWhenNoDataGivenToCountingHistogram() throws Exception { givenCountingHistogram(); whenConfigureIsCalled(); assertThatBuildFailed(); } @Test public void buildShouldFailWhenNoUnitGivenToCountingHistogram() throws Exception { givenCountingHistogram(); givenFilelifetimeValuesFor(150); givenBinCountOf(51); givenBinLabelOf(TimeUnit.DAYS.name()); givenDataLabelOf("COUNT"); givenHistogramTypeOf("File Lifetime Count"); whenConfigureIsCalled(); assertThatBuildFailed(); } private void assertThatBinWidthIs(int numUnits) { assertEquals("wrong binWidth", numUnits, (int) model.binWidth); } private void assertThatBuildFailed() { assertNotNull("Build succeeded but should have failed", error); model = null; } private List<Double> getRawLifetimes(int days) { List<Double> lifetimes = new ArrayList<>(); long radix = TimeUnit.DAYS.toMillis(days); /* * Ensure that the max is there so * the assertion always works, regardless * of the other random values. */ lifetimes.add((double) radix); for (int i = 1; i < days; ++i) { long duration = FastMath.abs(RANDOM.nextLong()) % radix; lifetimes.add((double) duration); } return lifetimes; } private void givenCountingHistogram() { if (model == null) { model = new CountingHistogram(); } else { model = new CountingHistogram((CountingHistogram) model); } } private void givenFilelifetimeValuesFor(int units) { model.setData(getRawLifetimes(units)); } }