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 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
