1/*
2 * Copyright (C) 2016 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 android.support.percent;
18
19import android.app.Activity;
20import android.app.Instrumentation;
21import android.support.test.InstrumentationRegistry;
22import android.support.test.rule.ActivityTestRule;
23import android.support.test.runner.AndroidJUnit4;
24import android.test.ActivityInstrumentationTestCase2;
25import junit.framework.Assert;
26import org.junit.Before;
27import org.junit.Rule;
28import org.junit.runner.RunWith;
29
30import static junit.framework.Assert.assertEquals;
31
32@RunWith(AndroidJUnit4.class)
33public abstract class BaseInstrumentationTestCase<A extends Activity> {
34    @Rule
35    public final ActivityTestRule<A> mActivityTestRule;
36
37    protected BaseInstrumentationTestCase(Class<A> activityClass) {
38        mActivityTestRule = new ActivityTestRule<A>(activityClass);
39    }
40
41    protected static void assertFuzzyEquals(String description, float expected, float actual) {
42        // On devices with certain screen densities we may run into situations where multiplying
43        // container width / height by a certain fraction ends up in a number that is almost but
44        // not exactly a round float number. For example, we can do float math to compute 15%
45        // of 1440 pixels and get 216.00002 due to inexactness of float math. This is why our
46        // tolerance is slightly bigger than 1 pixel in the comparison below.
47        assertEquals(description, expected, actual, 1.1f);
48    }
49}
50