1 /*
2  * Copyright (C) 2010 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 
17 package com.android.server;
18 
19 import android.content.Context;
20 import android.os.FileUtils;
21 import android.test.AndroidTestCase;
22 
23 import java.io.File;
24 
25 /**
26  * Tests for {@link com.android.server.EntropyMixer}
27  */
28 public class EntropyMixerTest extends AndroidTestCase {
29 
testInitialWrite()30     public void testInitialWrite() throws Exception {
31         File dir = getContext().getDir("testInitialWrite", Context.MODE_PRIVATE);
32         File file = File.createTempFile("testInitialWrite", "dat", dir);
33         file.deleteOnExit();
34         assertEquals(0, FileUtils.readTextFile(file, 0, null).length());
35 
36         // The constructor has the side effect of writing to file
37         new EntropyMixer(getContext(), "/dev/null", file.getCanonicalPath(), "/dev/null");
38 
39         assertTrue(FileUtils.readTextFile(file, 0, null).length() > 0);
40     }
41 }
42