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
17package com.android.server;
18
19import android.content.Context;
20import android.os.FileUtils;
21import android.test.AndroidTestCase;
22
23import java.io.File;
24
25/**
26 * Tests for {@link com.android.server.EntropyMixer}
27 */
28public class EntropyMixerTest extends AndroidTestCase {
29
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());
38
39        assertTrue(FileUtils.readTextFile(file, 0, null).length() > 0);
40    }
41}
42