1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2008 Google Inc. All rights reserved.
3 // http://code.google.com/p/protobuf/
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
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10 // notice, this list of conditions and the following disclaimer.
11 // * Redistributions in binary form must reproduce the above
12 // copyright notice, this list of conditions and the following disclaimer
13 // in the documentation and/or other materials provided with the
15 // * Neither the name of Google Inc. nor the names of its
16 // contributors may be used to endorse or promote products derived from
17 // this software without specific prior written permission.
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20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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31 package com.google.protobuf;
33 import junit.framework.TestCase;
35 import java.io.ByteArrayOutputStream;
36 import java.io.IOException;
37 import java.io.InputStream;
38 import java.io.OutputStream;
39 import java.io.UnsupportedEncodingException;
40 import java.nio.ByteBuffer;
41 import java.util.Arrays;
42 import java.util.List;
43 import java.util.NoSuchElementException;
46 * Test {@link LiteralByteString} by setting up a reference string in {@link #setUp()}.
47 * This class is designed to be extended for testing extensions of {@link LiteralByteString}
48 * such as {@link BoundedByteString}, see {@link BoundedByteStringTest}.
50 * @author carlanton@google.com (Carl Haverl)
52 public class LiteralByteStringTest extends TestCase {
53 protected static final String UTF_8 = "UTF-8";
55 protected String classUnderTest;
56 protected byte[] referenceBytes;
57 protected ByteString stringUnderTest;
58 protected int expectedHashCode;
61 protected void setUp() throws Exception {
62 classUnderTest = "LiteralByteString";
63 referenceBytes = ByteStringTest.getTestBytes(1234, 11337766L);
64 stringUnderTest = ByteString.copyFrom(referenceBytes);
65 expectedHashCode = 331161852;
68 public void testExpectedType() {
69 String actualClassName = getActualClassName(stringUnderTest);
70 assertEquals(classUnderTest + " should match type exactly", classUnderTest, actualClassName);
73 protected String getActualClassName(Object object) {
74 String actualClassName = object.getClass().getName();
75 actualClassName = actualClassName.substring(actualClassName.lastIndexOf('.') + 1);
76 return actualClassName;
79 public void testByteAt() {
80 boolean stillEqual = true;
81 for (int i = 0; stillEqual && i < referenceBytes.length; ++i) {
82 stillEqual = (referenceBytes[i] == stringUnderTest.byteAt(i));
84 assertTrue(classUnderTest + " must capture the right bytes", stillEqual);
87 public void testByteIterator() {
88 boolean stillEqual = true;
89 ByteString.ByteIterator iter = stringUnderTest.iterator();
90 for (int i = 0; stillEqual && i < referenceBytes.length; ++i) {
91 stillEqual = (iter.hasNext() && referenceBytes[i] == iter.nextByte());
93 assertTrue(classUnderTest + " must capture the right bytes", stillEqual);
94 assertFalse(classUnderTest + " must have exhausted the itertor", iter.hasNext());
98 fail("Should have thrown an exception.");
99 } catch (NoSuchElementException e) {
104 public void testByteIterable() {
105 boolean stillEqual = true;
107 for (byte quantum : stringUnderTest) {
108 stillEqual = (referenceBytes[j] == quantum);
111 assertTrue(classUnderTest + " must capture the right bytes as Bytes", stillEqual);
112 assertEquals(classUnderTest + " iterable character count", referenceBytes.length, j);
115 public void testSize() {
116 assertEquals(classUnderTest + " must have the expected size", referenceBytes.length,
117 stringUnderTest.size());
120 public void testGetTreeDepth() {
121 assertEquals(classUnderTest + " must have depth 0", 0, stringUnderTest.getTreeDepth());
124 public void testIsBalanced() {
125 assertTrue(classUnderTest + " is technically balanced", stringUnderTest.isBalanced());
128 public void testCopyTo_ByteArrayOffsetLength() {
129 int destinationOffset = 50;
131 byte[] destination = new byte[destinationOffset + length];
132 int sourceOffset = 213;
133 stringUnderTest.copyTo(destination, sourceOffset, destinationOffset, length);
134 boolean stillEqual = true;
135 for (int i = 0; stillEqual && i < length; ++i) {
136 stillEqual = referenceBytes[i + sourceOffset] == destination[i + destinationOffset];
138 assertTrue(classUnderTest + ".copyTo(4 arg) must give the expected bytes", stillEqual);
141 public void testCopyTo_ByteArrayOffsetLengthErrors() {
142 int destinationOffset = 50;
144 byte[] destination = new byte[destinationOffset + length];
147 // Copy one too many bytes
148 stringUnderTest.copyTo(destination, stringUnderTest.size() + 1 - length,
149 destinationOffset, length);
150 fail("Should have thrown an exception when copying too many bytes of a "
152 } catch (IndexOutOfBoundsException expected) {
157 // Copy with illegal negative sourceOffset
158 stringUnderTest.copyTo(destination, -1, destinationOffset, length);
159 fail("Should have thrown an exception when given a negative sourceOffset in "
161 } catch (IndexOutOfBoundsException expected) {
166 // Copy with illegal negative destinationOffset
167 stringUnderTest.copyTo(destination, 0, -1, length);
168 fail("Should have thrown an exception when given a negative destinationOffset in "
170 } catch (IndexOutOfBoundsException expected) {
175 // Copy with illegal negative size
176 stringUnderTest.copyTo(destination, 0, 0, -1);
177 fail("Should have thrown an exception when given a negative size in "
179 } catch (IndexOutOfBoundsException expected) {
184 // Copy with illegal too-large sourceOffset
185 stringUnderTest.copyTo(destination, 2 * stringUnderTest.size(), 0, length);
186 fail("Should have thrown an exception when the destinationOffset is too large in "
188 } catch (IndexOutOfBoundsException expected) {
193 // Copy with illegal too-large destinationOffset
194 stringUnderTest.copyTo(destination, 0, 2 * destination.length, length);
195 fail("Should have thrown an exception when the destinationOffset is too large in "
197 } catch (IndexOutOfBoundsException expected) {
202 public void testCopyTo_ByteBuffer() {
203 ByteBuffer myBuffer = ByteBuffer.allocate(referenceBytes.length);
204 stringUnderTest.copyTo(myBuffer);
205 assertTrue(classUnderTest + ".copyTo(ByteBuffer) must give back the same bytes",
206 Arrays.equals(referenceBytes, myBuffer.array()));
209 public void testAsReadOnlyByteBuffer() {
210 ByteBuffer byteBuffer = stringUnderTest.asReadOnlyByteBuffer();
211 byte[] roundTripBytes = new byte[referenceBytes.length];
212 assertTrue(byteBuffer.remaining() == referenceBytes.length);
213 assertTrue(byteBuffer.isReadOnly());
214 byteBuffer.get(roundTripBytes);
215 assertTrue(classUnderTest + ".asReadOnlyByteBuffer() must give back the same bytes",
216 Arrays.equals(referenceBytes, roundTripBytes));
219 public void testAsReadOnlyByteBufferList() {
220 List<ByteBuffer> byteBuffers = stringUnderTest.asReadOnlyByteBufferList();
222 byte[] roundTripBytes = new byte[referenceBytes.length];
223 for (ByteBuffer byteBuffer : byteBuffers) {
224 int thisLength = byteBuffer.remaining();
225 assertTrue(byteBuffer.isReadOnly());
226 assertTrue(bytesSeen + thisLength <= referenceBytes.length);
227 byteBuffer.get(roundTripBytes, bytesSeen, thisLength);
228 bytesSeen += thisLength;
230 assertTrue(bytesSeen == referenceBytes.length);
231 assertTrue(classUnderTest + ".asReadOnlyByteBufferTest() must give back the same bytes",
232 Arrays.equals(referenceBytes, roundTripBytes));
235 public void testToByteArray() {
236 byte[] roundTripBytes = stringUnderTest.toByteArray();
237 assertTrue(classUnderTest + ".toByteArray() must give back the same bytes",
238 Arrays.equals(referenceBytes, roundTripBytes));
241 public void testWriteTo() throws IOException {
242 ByteArrayOutputStream bos = new ByteArrayOutputStream();
243 stringUnderTest.writeTo(bos);
244 byte[] roundTripBytes = bos.toByteArray();
245 assertTrue(classUnderTest + ".writeTo() must give back the same bytes",
246 Arrays.equals(referenceBytes, roundTripBytes));
249 public void testWriteTo_mutating() throws IOException {
250 OutputStream os = new OutputStream() {
252 public void write(byte[] b, int off, int len) {
253 for (int x = 0; x < len; ++x) {
254 b[off + x] = (byte) 0;
259 public void write(int b) {
260 // Purposefully left blank.
264 stringUnderTest.writeTo(os);
265 byte[] newBytes = stringUnderTest.toByteArray();
266 assertTrue(classUnderTest + ".writeTo() must not grant access to underlying array",
267 Arrays.equals(referenceBytes, newBytes));
270 public void testNewOutput() throws IOException {
271 ByteArrayOutputStream bos = new ByteArrayOutputStream();
272 ByteString.Output output = ByteString.newOutput();
273 stringUnderTest.writeTo(output);
274 assertEquals("Output Size returns correct result",
275 output.size(), stringUnderTest.size());
277 assertTrue("Output.writeTo() must give back the same bytes",
278 Arrays.equals(referenceBytes, bos.toByteArray()));
280 // write the output stream to itself! This should cause it to double
281 output.writeTo(output);
282 assertEquals("Writing an output stream to itself is successful",
283 stringUnderTest.concat(stringUnderTest), output.toByteString());
286 assertEquals("Output.reset() resets the output", 0, output.size());
287 assertEquals("Output.reset() resets the output",
288 ByteString.EMPTY, output.toByteString());
292 public void testToString() throws UnsupportedEncodingException {
293 String testString = "I love unicode \u1234\u5678 characters";
294 LiteralByteString unicode = new LiteralByteString(testString.getBytes(UTF_8));
295 String roundTripString = unicode.toString(UTF_8);
296 assertEquals(classUnderTest + " unicode must match", testString, roundTripString);
299 public void testEquals() {
300 assertEquals(classUnderTest + " must not equal null", false, stringUnderTest.equals(null));
301 assertEquals(classUnderTest + " must equal self", stringUnderTest, stringUnderTest);
302 assertFalse(classUnderTest + " must not equal the empty string",
303 stringUnderTest.equals(ByteString.EMPTY));
304 assertEquals(classUnderTest + " empty strings must be equal",
305 new LiteralByteString(new byte[]{}), stringUnderTest.substring(55, 55));
306 assertEquals(classUnderTest + " must equal another string with the same value",
307 stringUnderTest, new LiteralByteString(referenceBytes));
309 byte[] mungedBytes = new byte[referenceBytes.length];
310 System.arraycopy(referenceBytes, 0, mungedBytes, 0, referenceBytes.length);
311 mungedBytes[mungedBytes.length - 5] ^= 0xFF;
312 assertFalse(classUnderTest + " must not equal every string with the same length",
313 stringUnderTest.equals(new LiteralByteString(mungedBytes)));
316 public void testHashCode() {
317 int hash = stringUnderTest.hashCode();
318 assertEquals(classUnderTest + " must have expected hashCode", expectedHashCode, hash);
321 public void testPeekCachedHashCode() {
322 assertEquals(classUnderTest + ".peekCachedHashCode() should return zero at first", 0,
323 stringUnderTest.peekCachedHashCode());
324 stringUnderTest.hashCode();
325 assertEquals(classUnderTest + ".peekCachedHashCode should return zero at first",
326 expectedHashCode, stringUnderTest.peekCachedHashCode());
329 public void testPartialHash() {
330 // partialHash() is more strenuously tested elsewhere by testing hashes of substrings.
331 // This test would fail if the expected hash were 1. It's not.
332 int hash = stringUnderTest.partialHash(stringUnderTest.size(), 0, stringUnderTest.size());
333 assertEquals(classUnderTest + ".partialHash() must yield expected hashCode",
334 expectedHashCode, hash);
337 public void testNewInput() throws IOException {
338 InputStream input = stringUnderTest.newInput();
339 assertEquals("InputStream.available() returns correct value",
340 stringUnderTest.size(), input.available());
341 boolean stillEqual = true;
342 for (byte referenceByte : referenceBytes) {
343 int expectedInt = (referenceByte & 0xFF);
344 stillEqual = (expectedInt == input.read());
346 assertEquals("InputStream.available() returns correct value",
347 0, input.available());
348 assertTrue(classUnderTest + " must give the same bytes from the InputStream", stillEqual);
349 assertEquals(classUnderTest + " InputStream must now be exhausted", -1, input.read());
352 public void testNewInput_skip() throws IOException {
353 InputStream input = stringUnderTest.newInput();
354 int stringSize = stringUnderTest.size();
355 int nearEndIndex = stringSize * 2 / 3;
356 long skipped1 = input.skip(nearEndIndex);
357 assertEquals("InputStream.skip()", skipped1, nearEndIndex);
358 assertEquals("InputStream.available()",
359 stringSize - skipped1, input.available());
360 assertTrue("InputStream.mark() is available", input.markSupported());
362 assertEquals("InputStream.skip(), read()",
363 stringUnderTest.byteAt(nearEndIndex) & 0xFF, input.read());
364 assertEquals("InputStream.available()",
365 stringSize - skipped1 - 1, input.available());
366 long skipped2 = input.skip(stringSize);
367 assertEquals("InputStream.skip() incomplete",
368 skipped2, stringSize - skipped1 - 1);
369 assertEquals("InputStream.skip(), no more input", 0, input.available());
370 assertEquals("InputStream.skip(), no more input", -1, input.read());
372 assertEquals("InputStream.reset() succeded",
373 stringSize - skipped1, input.available());
374 assertEquals("InputStream.reset(), read()",
375 stringUnderTest.byteAt(nearEndIndex) & 0xFF, input.read());
378 public void testNewCodedInput() throws IOException {
379 CodedInputStream cis = stringUnderTest.newCodedInput();
380 byte[] roundTripBytes = cis.readRawBytes(referenceBytes.length);
381 assertTrue(classUnderTest + " must give the same bytes back from the CodedInputStream",
382 Arrays.equals(referenceBytes, roundTripBytes));
383 assertTrue(classUnderTest + " CodedInputStream must now be exhausted", cis.isAtEnd());
387 * Make sure we keep things simple when concatenating with empty. See also
388 * {@link ByteStringTest#testConcat_empty()}.
390 public void testConcat_empty() {
391 assertSame(classUnderTest + " concatenated with empty must give " + classUnderTest,
392 stringUnderTest.concat(ByteString.EMPTY), stringUnderTest);
393 assertSame("empty concatenated with " + classUnderTest + " must give " + classUnderTest,
394 ByteString.EMPTY.concat(stringUnderTest), stringUnderTest);