1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/**
* Copyright (C) 2018 Adrien Hopkins
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package sevenUnits.unit;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import org.junit.jupiter.api.Test;
import sevenUnits.utils.DecimalComparison;
import sevenUnits.utils.UncertainDouble;
/**
* Testing the various Unit classes. This is NOT part of this program's public
* API.
*
* @author Adrien Hopkins
* @since 2018-12-22
* @since v0.1.0
*/
class UnitTest {
/** A random number generator */
private static final Random rng = ThreadLocalRandom.current();
@Test
public void testAdditionAndSubtraction() {
final LinearUnit inch = Metric.METRE.times(0.0254)
.withName(NameSymbol.of("inch", "in"));
final LinearUnit foot = Metric.METRE.times(0.3048)
.withName(NameSymbol.of("foot", "ft"));
assertEquals(inch.plus(foot), Metric.METRE.times(0.3302));
assertEquals(foot.minus(inch), Metric.METRE.times(0.2794));
// test with LinearUnitValue
final LinearUnitValue value1 = LinearUnitValue.getExact(Metric.METRE, 15);
final LinearUnitValue value2 = LinearUnitValue.getExact(foot, 120);
final LinearUnitValue value3 = LinearUnitValue.getExact(Metric.METRE,
0.5);
final LinearUnitValue value4 = LinearUnitValue.getExact(Metric.KILOGRAM,
60);
// make sure addition is done correctly
assertEquals(51.576, value1.plus(value2).getValueExact(), 0.001);
assertEquals(15.5, value1.plus(value3).getValueExact());
assertEquals(52.076, value1.plus(value2).plus(value3).getValueExact(),
0.001);
// make sure addition uses the correct unit, and is still associative
// (ignoring floating-point rounding errors)
assertEquals(Metric.METRE, value1.plus(value2).getUnit());
assertEquals(Metric.METRE, value1.plus(value2).plus(value3).getUnit());
assertEquals(foot, value2.plus(value1).getUnit());
assertTrue(value1.plus(value2).equals(value2.plus(value1), true));
// make sure errors happen when they should
assertThrows(IllegalArgumentException.class, () -> value1.plus(value4));
assertThrows(IllegalArgumentException.class, () -> value1.minus(value4));
}
@Test
public void testConversion() {
final LinearUnit metre = Metric.METRE;
final Unit inch = metre.times(0.0254);
final UnitValue value = UnitValue.of(inch, 75);
assertEquals(1.9, inch.convertTo(metre, 75), 0.01);
assertEquals(1.9, value.convertTo(metre).getValue(), 0.01);
// try random stuff
for (int i = 0; i < 1000; i++) {
// initiate random values
final double conversionFactor = UnitTest.rng.nextDouble() * 1000000;
final double testValue = UnitTest.rng.nextDouble() * 1000000;
final double expected = testValue * conversionFactor;
// test
final Unit unit = Metric.METRE.times(conversionFactor);
final double actual = unit.convertToBase(testValue);
assertEquals(actual, expected,
expected * DecimalComparison.DOUBLE_EPSILON);
}
}
@Test
public void testEquals() {
final LinearUnit metre = Metric.METRE;
final Unit meter = Metric.BaseUnits.METRE.asLinearUnit();
assertEquals(metre, meter);
}
@Test
public void testIsMetric() {
final Unit metre = Metric.METRE;
final Unit megasecond = Metric.SECOND.withPrefix(Metric.MEGA);
final Unit hour = Metric.HOUR;
assertTrue(metre.isMetric());
assertTrue(megasecond.isMetric());
assertFalse(hour.isMetric());
}
@Test
public void testMultiplicationAndDivision() {
// test unit-times-unit multiplication
final LinearUnit generatedJoule = Metric.KILOGRAM
.times(Metric.METRE.toExponent(2))
.dividedBy(Metric.SECOND.toExponent(2));
final LinearUnit actualJoule = Metric.JOULE;
assertEquals(generatedJoule, actualJoule);
// test multiplication by conversion factors
final LinearUnit kilometre = Metric.METRE.times(1000);
final LinearUnit hour = Metric.SECOND.times(3600);
final LinearUnit generatedKPH = kilometre.dividedBy(hour);
final LinearUnit actualKPH = Metric.METRE.dividedBy(Metric.SECOND)
.dividedBy(3.6);
assertEquals(generatedKPH, actualKPH);
}
@Test
public void testPrefixes() {
final LinearUnit generatedKilometre = Metric.METRE
.withPrefix(Metric.KILO);
final LinearUnit actualKilometre = Metric.METRE.times(1000);
assertEquals(generatedKilometre, actualKilometre);
}
/**
* Tests converting an uncertain LinearUnitValue to a string.
*
* @since 2021-11-04
*/
@Test
public void testValueToString1() {
final LinearUnitValue value = LinearUnitValue.of(Metric.METRE,
UncertainDouble.of(10, 0.24));
assertEquals("(10.0 ± 0.2) m", value.toString());
assertEquals("(10.0 ± 0.2) m", value.toString(true));
assertEquals("10.0 m", value.toString(false));
}
/**
* Tests converting a certain LinearUnitValue to a string.
*
* @since 2021-11-04
*/
@Test
public void testValueToString2() {
final LinearUnitValue value = LinearUnitValue.of(Metric.METRE,
UncertainDouble.of(10, 0));
assertEquals("10.0 m", value.toString());
assertEquals("(10.0 ± 0.0) m", value.toString(true));
assertEquals("10.0 m", value.toString(false));
}
/**
* Tests converting an unnamed LinearUnitValue to a string.
*
* @since 2021-11-04
*/
@Test
public void testValueToString3() {
final LinearUnitValue value = LinearUnitValue.of(
Metric.METRE.withName(NameSymbol.EMPTY),
UncertainDouble.of(10, 0.24));
assertEquals("10.0 unnamed unit (= 10.0 m)", value.toString(false));
}
/**
* Tests converting a named UnitValue to a string.
*
* @since 2021-11-04
*/
@Test
public void testValueToString4() {
final UnitValue value = UnitValue.of(BritishImperial.FAHRENHEIT, 80);
assertEquals("80.0 \u00B0F", value.toString());
}
/**
* Tests converting an unnamed UnitValue to a string.
*
* @since 2021-11-04
*/
@Test
public void testValueToString5() {
final UnitValue value = UnitValue
.of(USCustomary.FAHRENHEIT.withName(NameSymbol.EMPTY), 50);
assertEquals("50.0 unnamed unit (= 283.15 K)", value.toString());
}
}
|
