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      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.EntropyService}
     27  */
     28 public class EntropyServiceTest 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 EntropyService("/dev/null", file.getCanonicalPath());
     38 
     39         assertTrue(FileUtils.readTextFile(file, 0, null).length() > 0);
     40     }
     41 }
     42