1 /* 2 * Copyright (C) 2007 The Guava Authors 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.google.common.io; 18 19 import java.io.ByteArrayOutputStream; 20 21 /** 22 * Unit tests for {@link CountingOutputStream}. 23 * 24 * @author Chris Nokleberg 25 */ 26 public class CountingOutputStreamTest extends IoTestCase { 27 28 public void testCount() throws Exception { 29 int written = 0; 30 ByteArrayOutputStream out = new ByteArrayOutputStream(); 31 CountingOutputStream counter = new CountingOutputStream(out); 32 assertEquals(written, out.size()); 33 assertEquals(written, counter.getCount()); 34 35 counter.write(0); 36 written += 1; 37 assertEquals(written, out.size()); 38 assertEquals(written, counter.getCount()); 39 40 byte[] data = new byte[10]; 41 counter.write(data); 42 written += 10; 43 assertEquals(written, out.size()); 44 assertEquals(written, counter.getCount()); 45 46 counter.write(data, 0, 5); 47 written += 5; 48 assertEquals(written, out.size()); 49 assertEquals(written, counter.getCount()); 50 51 counter.write(data, 2, 5); 52 written += 5; 53 assertEquals(written, out.size()); 54 assertEquals(written, counter.getCount()); 55 56 // Test that illegal arguments do not affect count 57 try { 58 counter.write(data, 0, data.length + 1); 59 fail("expected exception"); 60 } catch (IndexOutOfBoundsException expected) { 61 } 62 assertEquals(written, out.size()); 63 assertEquals(written, counter.getCount()); 64 } 65 } 66
