RationalTest.java revision b519cc52ecba8f44da31173c9fc90a7b66d52b79 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.mediaframeworktest.unit;
18
19import android.test.suitebuilder.annotation.SmallTest;
20import android.hardware.photography.Rational;
21
22/**
23 * <pre>
24 * adb shell am instrument \
25 *      -e class 'com.android.mediaframeworktest.unit.RationalTest' \
26 *      -w com.android.mediaframeworktest/.MediaFrameworkUnitTestRunner
27 * </pre>
28 */
29public class RationalTest extends junit.framework.TestCase {
30    @SmallTest
31    public void testConstructor() {
32
33        // Simple case
34        Rational r = new Rational(1, 2);
35        assertEquals(1, r.getNumerator());
36        assertEquals(2, r.getDenominator());
37
38        // Denominator negative
39        r = new Rational(-1, 2);
40        assertEquals(-1, r.getNumerator());
41        assertEquals(2, r.getDenominator());
42
43        // Numerator negative
44        r = new Rational(1, -2);
45        assertEquals(-1, r.getNumerator());
46        assertEquals(2, r.getDenominator());
47
48        // Both negative
49        r = new Rational(-1, -2);
50        assertEquals(1, r.getNumerator());
51        assertEquals(2, r.getDenominator());
52
53        // Dividing by zero is not allowed
54        try {
55            r = new Rational(1, 0);
56            fail("Expected Rational constructor to throw an IllegalArgumentException");
57        } catch(IllegalArgumentException e) {
58        }
59    }
60
61    @SmallTest
62    public void testGcd() {
63        Rational r = new Rational(1, 2);
64        assertEquals(1, r.gcd());
65
66        Rational twoThirds = new Rational(2, 3);
67        assertEquals(1, twoThirds.gcd());
68
69        Rational moreComplicated2 = new Rational(5*78, 7*78);
70        assertEquals(78, moreComplicated2.gcd());
71
72        Rational oneHalf = new Rational(-1, 2);
73        assertEquals(1, oneHalf.gcd());
74
75        twoThirds = new Rational(-2, 3);
76        assertEquals(1, twoThirds.gcd());
77    }
78
79    @SmallTest
80    public void testEquals() {
81        Rational r = new Rational(1, 2);
82        assertEquals(1, r.getNumerator());
83        assertEquals(2, r.getDenominator());
84
85        assertEquals(r, r);
86        assertFalse(r.equals(null));
87        assertFalse(r.equals(new Object()));
88
89        Rational twoThirds = new Rational(2, 3);
90        assertFalse(r.equals(twoThirds));
91        assertFalse(twoThirds.equals(r));
92
93        Rational fourSixths = new Rational(4, 6);
94        assertEquals(twoThirds, fourSixths);
95        assertEquals(fourSixths, twoThirds);
96
97        Rational moreComplicated = new Rational(5*6*7*8*9, 1*2*3*4*5);
98        Rational moreComplicated2 = new Rational(5*6*7*8*9*78, 1*2*3*4*5*78);
99        assertEquals(moreComplicated, moreComplicated2);
100        assertEquals(moreComplicated2, moreComplicated);
101
102        // Ensure negatives are fine
103        twoThirds = new Rational(-2, 3);
104        fourSixths = new Rational(-4, 6);
105        assertEquals(twoThirds, fourSixths);
106        assertEquals(fourSixths, twoThirds);
107
108        moreComplicated = new Rational(-5*6*7*8*9, 1*2*3*4*5);
109        moreComplicated2 = new Rational(-5*6*7*8*9*78, 1*2*3*4*5*78);
110        assertEquals(moreComplicated, moreComplicated2);
111        assertEquals(moreComplicated2, moreComplicated);
112
113    }
114}