common/yang-common/src/test/java/org/opendaylight/yangtools/yang/common/YT1440Test.java

   1 /*
   2  * Copyright (c) 2022 PANTHEON.tech, s.r.o. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.yangtools.yang.common;
   9
  10 import static org.junit.jupiter.api.Assertions.assertEquals;
  11 import static org.junit.jupiter.api.Assertions.assertSame;
  12 import static org.junit.jupiter.api.Assertions.assertThrows;
  13
  14 import java.math.RoundingMode;
  15 import org.junit.jupiter.api.Test;
  16
  17 public class YT1440Test {
  18     @Test
  19     public void testScaleSame() {
  20         final var twenty = Decimal64.valueOf(2, 20);
  21         assertSame(twenty, twenty.scaleTo(2));
  22
  23         // Do not tolerate null rounding even for no-op
  24         assertThrows(NullPointerException.class, () -> twenty.scaleTo(2, null));
  25     }
  26
  27     @Test
  28     public void testScaleZero() {
  29         final var two = Decimal64.valueOf(2, 0);
  30         final var one = two.scaleTo(1);
  31         assertEquals(1, one.scale());
  32         assertEquals(0, one.unscaledValue());
  33         final var three = two.scaleTo(3);
  34         assertEquals(3, three.scale());
  35         assertEquals(0, three.unscaledValue());
  36     }
  37
  38     @Test
  39     public void testScaleUpNoRemain() {
  40         // Template, scale=5
  41         final var two = Decimal64.valueOf(2, 20);
  42
  43         // scale = 5
  44         final var five = two.scaleTo(5);
  45         assertEquals(5, five.scale());
  46         assertEquals(two, five);
  47         assertEquals("20.0", five.toString());
  48
  49         // scale = 18 fails
  50         final var ex = assertThrows(ArithmeticException.class, () -> two.scaleTo(18));
  51         assertEquals("Increasing scale of 20.0 to 18 would overflow", ex.getMessage());
  52     }
  53
  54     @Test
  55     public void testScaleDownNoRemain() {
  56         // Template, scale=5
  57         final var five = Decimal64.valueOf(5, 20);
  58
  59         // scale = 2
  60         final var two = five.scaleTo(2);
  61         assertEquals(2, two.scale());
  62         assertEquals(five, two);
  63         assertEquals("20.0", two.toString());
  64     }
  65
  66     @Test
  67     public void testScaleDownPositive() {
  68         final var two = Decimal64.valueOf("0.63");
  69         assertEquals(2, two.scale());
  70         assertEquals(63, two.unscaledValue());
  71
  72         // Trim '3'
  73         assertScaleDown(7, two, 1, RoundingMode.UP);
  74         assertScaleDown(6, two, 1, RoundingMode.DOWN);
  75         assertScaleDown(7, two, 1, RoundingMode.CEILING);
  76         assertScaleDown(6, two, 1, RoundingMode.FLOOR);
  77         assertScaleDown(6, two, 1, RoundingMode.HALF_UP);
  78         assertScaleDown(6, two, 1, RoundingMode.HALF_DOWN);
  79         assertScaleDown(6, two, 1, RoundingMode.HALF_EVEN);
  80
  81         final var three = Decimal64.valueOf("0.635");
  82         assertEquals(3, three.scale());
  83         assertEquals(635, three.unscaledValue());
  84
  85         // Trim '5'
  86         assertScaleDown(64, three, 2, RoundingMode.UP);
  87         assertScaleDown(63, three, 2, RoundingMode.DOWN);
  88         assertScaleDown(64, three, 2, RoundingMode.CEILING);
  89         assertScaleDown(63, three, 2, RoundingMode.FLOOR);
  90         assertScaleDown(64, three, 2, RoundingMode.HALF_UP);
  91         assertScaleDown(63, three, 2, RoundingMode.HALF_DOWN);
  92         assertScaleDown(64, three, 2, RoundingMode.HALF_EVEN);
  93
  94         // Trim '35'
  95         assertScaleDown(7, three, 1, RoundingMode.UP);
  96         assertScaleDown(6, three, 1, RoundingMode.DOWN);
  97         assertScaleDown(7, three, 1, RoundingMode.CEILING);
  98         assertScaleDown(6, three, 1, RoundingMode.FLOOR);
  99         assertScaleDown(6, three, 1, RoundingMode.HALF_UP);
 100         assertScaleDown(6, three, 1, RoundingMode.HALF_DOWN);
 101         assertScaleDown(6, three, 1, RoundingMode.HALF_EVEN);
 102
 103         final var four = Decimal64.valueOf("0.6355");
 104         assertEquals(4, four.scale());
 105         assertEquals(6355, four.unscaledValue());
 106
 107         // Trim 55
 108         assertScaleDown(64, four, 2, RoundingMode.UP);
 109         assertScaleDown(63, four, 2, RoundingMode.DOWN);
 110         assertScaleDown(64, four, 2, RoundingMode.CEILING);
 111         assertScaleDown(63, four, 2, RoundingMode.FLOOR);
 112         assertScaleDown(64, four, 2, RoundingMode.HALF_UP);
 113         assertScaleDown(64, four, 2, RoundingMode.HALF_DOWN);
 114         assertScaleDown(64, four, 2, RoundingMode.HALF_EVEN);
 115
 116         final var five = Decimal64.valueOf("0.635").scaleTo(5);
 117         assertEquals(5, five.scale());
 118         assertEquals(63500, five.unscaledValue());
 119
 120         // Trim 500
 121         assertScaleDown(64, five, 2, RoundingMode.UP);
 122         assertScaleDown(63, five, 2, RoundingMode.DOWN);
 123         assertScaleDown(64, five, 2, RoundingMode.CEILING);
 124         assertScaleDown(63, five, 2, RoundingMode.FLOOR);
 125         assertScaleDown(64, five, 2, RoundingMode.HALF_UP);
 126         assertScaleDown(63, five, 2, RoundingMode.HALF_DOWN);
 127         assertScaleDown(64, five, 2, RoundingMode.HALF_EVEN);
 128     }
 129
 130     @Test
 131     public void testScaleDownNegative() {
 132         final var two = Decimal64.valueOf("-0.63");
 133         assertEquals(2, two.scale());
 134         assertEquals(-63, two.unscaledValue());
 135
 136         // Trim '3'
 137         assertScaleDown(-7, two, 1, RoundingMode.UP);
 138         assertScaleDown(-6, two, 1, RoundingMode.DOWN);
 139         assertScaleDown(-6, two, 1, RoundingMode.CEILING);
 140         assertScaleDown(-7, two, 1, RoundingMode.FLOOR);
 141         assertScaleDown(-6, two, 1, RoundingMode.HALF_UP);
 142         assertScaleDown(-6, two, 1, RoundingMode.HALF_DOWN);
 143         assertScaleDown(-6, two, 1, RoundingMode.HALF_EVEN);
 144
 145         final var three = Decimal64.valueOf("-0.635");
 146         assertEquals(3, three.scale());
 147         assertEquals(-635, three.unscaledValue());
 148
 149         // Trim '5'
 150         assertScaleDown(-64, three, 2, RoundingMode.UP);
 151         assertScaleDown(-63, three, 2, RoundingMode.DOWN);
 152         assertScaleDown(-63, three, 2, RoundingMode.CEILING);
 153         assertScaleDown(-64, three, 2, RoundingMode.FLOOR);
 154         assertScaleDown(-64, three, 2, RoundingMode.HALF_UP);
 155         assertScaleDown(-63, three, 2, RoundingMode.HALF_DOWN);
 156         assertScaleDown(-64, three, 2, RoundingMode.HALF_EVEN);
 157
 158         // Trim '35'
 159         assertScaleDown(-7, three, 1, RoundingMode.UP);
 160         assertScaleDown(-6, three, 1, RoundingMode.DOWN);
 161         assertScaleDown(-6, three, 1, RoundingMode.CEILING);
 162         assertScaleDown(-7, three, 1, RoundingMode.FLOOR);
 163         assertScaleDown(-6, three, 1, RoundingMode.HALF_UP);
 164         assertScaleDown(-6, three, 1, RoundingMode.HALF_DOWN);
 165         assertScaleDown(-6, three, 1, RoundingMode.HALF_EVEN);
 166
 167         final var four = Decimal64.valueOf("-0.6355");
 168         assertEquals(4, four.scale());
 169         assertEquals(-6355, four.unscaledValue());
 170
 171         // Trim 55
 172         assertScaleDown(-64, four, 2, RoundingMode.UP);
 173         assertScaleDown(-63, four, 2, RoundingMode.DOWN);
 174         assertScaleDown(-63, four, 2, RoundingMode.CEILING);
 175         assertScaleDown(-64, four, 2, RoundingMode.FLOOR);
 176         assertScaleDown(-64, four, 2, RoundingMode.HALF_UP);
 177         assertScaleDown(-64, four, 2, RoundingMode.HALF_DOWN);
 178         assertScaleDown(-64, four, 2, RoundingMode.HALF_EVEN);
 179
 180         final var five = Decimal64.valueOf("-0.635").scaleTo(5);
 181         assertEquals(5, five.scale());
 182         assertEquals(-63500, five.unscaledValue());
 183
 184         // Trim 500
 185         assertScaleDown(-64, five, 2, RoundingMode.UP);
 186         assertScaleDown(-63, five, 2, RoundingMode.DOWN);
 187         assertScaleDown(-63, five, 2, RoundingMode.CEILING);
 188         assertScaleDown(-64, five, 2, RoundingMode.FLOOR);
 189         assertScaleDown(-64, five, 2, RoundingMode.HALF_UP);
 190         assertScaleDown(-63, five, 2, RoundingMode.HALF_DOWN);
 191         assertScaleDown(-64, five, 2, RoundingMode.HALF_EVEN);
 192     }
 193
 194     @Test
 195     public void testScaleDownTrim() {
 196         final var two = Decimal64.valueOf("0.63");
 197         final var ex = assertThrows(ArithmeticException.class, () -> two.scaleTo(1));
 198         assertEquals("Decreasing scale of 0.63 to 1 requires rounding", ex.getMessage());
 199     }
 200
 201     private static void assertScaleDown(final long expectedUnscaled, final Decimal64 value, final int scale,
 202             final RoundingMode mode) {
 203         final var scaled = value.scaleTo(scale, mode);
 204         assertEquals(scale, scaled.scale());
 205         assertEquals(expectedUnscaled, scaled.unscaledValue());
 206     }
 207 }