junit4 测试android,在UI线程上测试Android Junit4

使用InstrumentationRegistry.getInstrumentation().runOnMainSync()：

/***

Copyright (c) 2008-2015 CommonsWare,LLC

Licensed under the Apache License,Version 2.0 (the "License"); you may not

use this file except in compliance with the License. You may obtain a copy

of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required

by applicable law or agreed to in writing,software distributed under the

License is distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS

OF ANY KIND,either express or implied. See the License for the specific

language governing permissions and limitations under the License.

From _The Busy Coder's Guide to Android Development_

http://commonsware.com/Android

*/

package com.commonsware.android.abf.test;

import android.support.test.InstrumentationRegistry;

import android.support.test.runner.AndroidJUnit4;

import android.test.AndroidTestCase;

import android.test.UiThreadTest;

import android.view.LayoutInflater;

import android.view.View;

import com.commonsware.android.abf.R;

import junit.framework.Assert;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4.class)

public class DemoContextTest {

private View field=null;

private View root=null;

@Before

public void init() {

InstrumentationRegistry.getInstrumentation().runOnMainSync(new Runnable() {

@Override

public void run() {

LayoutInflater inflater=LayoutInflater

.from(InstrumentationRegistry.getTargetContext());

root=inflater.inflate(R.layout.add,null);

}

});

root.measure(800,480);

root.layout(0,800,480);

field=root.findViewById(R.id.title);

}

@Test

public void exists() {

init();

Assert.assertNotNull(field);

}

@Test

public void position() {

init();

Assert.assertEquals(0,field.getTop());

Assert.assertEquals(0,field.getLeft());

}

}