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
|
/**
* Copyright (C) 2019 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 test.java;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.unitConverter.math.ExpressionParser;
/**
* A test for the {@code ExpressionParser} class. This is NOT part of this program's public API.
*
* @author Adrien Hopkins
* @since 2019-03-22
* @since v0.2.0
*/
public class ExpressionParserTest {
private static final ExpressionParser<Integer> numberParser = new ExpressionParser.Builder<>(Integer::parseInt)
.addBinaryOperator("+", (o1, o2) -> o1 + o2, 0).addBinaryOperator("-", (o1, o2) -> o1 - o2, 0)
.addBinaryOperator("*", (o1, o2) -> o1 * o2, 1).addBinaryOperator("/", (o1, o2) -> o1 / o2, 1)
.addBinaryOperator("^", (o1, o2) -> (int) Math.pow(o1, o2), 2).build();
/**
* Test method for {@link org.unitConverter.math.ExpressionParser#parseExpression(java.lang.String)}.
*/
@Test
public void testParseExpression() {
// test parsing of expressions
assertEquals((int) numberParser.parseExpression("1 + 2 ^ 5 * 3"), 97);
assertEquals((int) numberParser.parseExpression("(1 + 2) ^ 5 * 3"), 729);
// ensure it normally goes left to right
assertEquals((int) numberParser.parseExpression("1 + 2 + 3 + 4"), 10);
assertEquals((int) numberParser.parseExpression("12 - 4 - 3"), 5);
assertEquals((int) numberParser.parseExpression("12 - (4 - 3)"), 11);
assertEquals((int) numberParser.parseExpression("1 / 2 + 3"), 3);
}
}
|
