russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
83 lines
3.6 KiB
Java
83 lines
3.6 KiB
Java
/*
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* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8369050
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* @summary Check rounding of DecimalFormat on tie cases when the maximum
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* fraction digits allowed is one less than the position of the first
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* significant digit in the double.
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* @run junit RoundingTiesNearZeroTest
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*/
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.Arguments;
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import org.junit.jupiter.params.provider.MethodSource;
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import java.math.RoundingMode;
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import java.text.NumberFormat;
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import java.util.Locale;
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import java.util.stream.Stream;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class RoundingTiesNearZeroTest {
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// Safe to re-use since we are not testing any fast-path cases
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// so state is irrelevant
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private static final NumberFormat format = NumberFormat.getInstance(Locale.US);
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@ParameterizedTest
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@MethodSource("ties")
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void roundingTieTest(RoundingMode rm, int maxDigits, double db, String expected) {
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format.setRoundingMode(rm);
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format.setMaximumFractionDigits(maxDigits);
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assertEquals(expected, format.format(db), "Rounding failed under " + rm);
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}
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static Stream<Arguments> ties() {
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return Stream.of(
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// 1) String is exact as binary
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// 0.5 -> 0.5
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Arguments.of(RoundingMode.HALF_EVEN, 0, 0.5, "0"),
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Arguments.of(RoundingMode.HALF_UP, 0, 0.5, "1"),
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Arguments.of(RoundingMode.HALF_DOWN, 0, 0.5, "0"),
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// 2) String is rounded up from binary
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// 0.0000005 -> 4.999999999999999773740559129431293428069693618454039096832275390625E-7
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Arguments.of(RoundingMode.HALF_EVEN, 6, 0.0000005, "0"),
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Arguments.of(RoundingMode.HALF_UP, 6, 0.0000005, "0"),
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Arguments.of(RoundingMode.HALF_DOWN, 6, 0.0000005, "0"),
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// 3) String is not rounded up from binary
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// Non-exponential notation
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// 0.05 -> 0.05000000000000000277555756156289135105907917022705078125
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Arguments.of(RoundingMode.HALF_EVEN, 1, 0.05, "0.1"),
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Arguments.of(RoundingMode.HALF_UP, 1, 0.05, "0.1"),
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Arguments.of(RoundingMode.HALF_DOWN, 1, 0.05, "0.1"),
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// Exponential notation
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// 0.00005 -> 0.0000500000000000000023960868011929647991564706899225711822509765625
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Arguments.of(RoundingMode.HALF_EVEN, 4, 0.00005, "0.0001"),
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Arguments.of(RoundingMode.HALF_UP, 4, 0.00005, "0.0001"),
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Arguments.of(RoundingMode.HALF_DOWN, 4, 0.00005, "0.0001")
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);
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}
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}
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