// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
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package com.google.protobuf;
import com.google.protobuf.IsValidUtf8TestUtil.Shard;
import junit.framework.TestCase;
import java.io.UnsupportedEncodingException;
/**
* Tests cases for {@link ByteString#isValidUtf8()}. This includes three
* brute force tests that actually test every permutation of one byte, two byte,
* and three byte sequences to ensure that the method produces the right result
* for every possible byte encoding where "right" means it's consistent with
* java's UTF-8 string encoding/decoding such that the method returns true for
* any sequence that will round trip when converted to a String and then back to
* bytes and will return false for any sequence that will not round trip.
* See also {@link IsValidUtf8FourByteTest}. It also includes some
* other more targeted tests.
*
* @author jonp@google.com (Jon Perlow)
* @author martinrb@google.com (Martin Buchholz)
*/
public class IsValidUtf8Test extends TestCase {
/**
* Tests that round tripping of all two byte permutations work.
*/
public void testIsValidUtf8_1Byte() throws UnsupportedEncodingException {
IsValidUtf8TestUtil.testBytes(1,
IsValidUtf8TestUtil.EXPECTED_ONE_BYTE_ROUNDTRIPPABLE_COUNT);
}
/**
* Tests that round tripping of all two byte permutations work.
*/
public void testIsValidUtf8_2Bytes() throws UnsupportedEncodingException {
IsValidUtf8TestUtil.testBytes(2,
IsValidUtf8TestUtil.EXPECTED_TWO_BYTE_ROUNDTRIPPABLE_COUNT);
}
/**
* Tests that round tripping of all three byte permutations work.
*/
public void testIsValidUtf8_3Bytes() throws UnsupportedEncodingException {
IsValidUtf8TestUtil.testBytes(3,
IsValidUtf8TestUtil.EXPECTED_THREE_BYTE_ROUNDTRIPPABLE_COUNT);
}
/**
* Tests that round tripping of a sample of four byte permutations work.
* All permutations are prohibitively expensive to test for automated runs;
* {@link IsValidUtf8FourByteTest} is used for full coverage. This method
* tests specific four-byte cases.
*/
public void testIsValidUtf8_4BytesSamples()
throws UnsupportedEncodingException {
// Valid 4 byte.
assertValidUtf8(0xF0, 0xA4, 0xAD, 0xA2);
// Bad trailing bytes
assertInvalidUtf8(0xF0, 0xA4, 0xAD, 0x7F);
assertInvalidUtf8(0xF0, 0xA4, 0xAD, 0xC0);
// Special cases for byte2
assertInvalidUtf8(0xF0, 0x8F, 0xAD, 0xA2);
assertInvalidUtf8(0xF4, 0x90, 0xAD, 0xA2);
}
/**
* Tests some hard-coded test cases.
*/
public void testSomeSequences() {
// Empty
assertTrue(asBytes("").isValidUtf8());
// One-byte characters, including control characters
assertTrue(asBytes("\u0000abc\u007f").isValidUtf8());
// Two-byte characters
assertTrue(asBytes("\u00a2\u00a2").isValidUtf8());
// Three-byte characters
assertTrue(asBytes("\u020ac\u020ac").isValidUtf8());
// Four-byte characters
assertTrue(asBytes("\u024B62\u024B62").isValidUtf8());
// Mixed string
assertTrue(
asBytes("a\u020ac\u00a2b\\u024B62u020acc\u00a2de\u024B62")
.isValidUtf8());
// Not a valid string
assertInvalidUtf8(-1, 0, -1, 0);
}
private byte[] toByteArray(int... bytes) {
byte[] realBytes = new byte[bytes.length];
for (int i = 0; i < bytes.length; i++) {
realBytes[i] = (byte) bytes[i];
}
return realBytes;
}
private ByteString toByteString(int... bytes) {
return ByteString.copyFrom(toByteArray(bytes));
}
private void assertValidUtf8(int[] bytes, boolean not) {
byte[] realBytes = toByteArray(bytes);
assertTrue(not ^ Utf8.isValidUtf8(realBytes));
assertTrue(not ^ Utf8.isValidUtf8(realBytes, 0, bytes.length));
ByteString lit = ByteString.copyFrom(realBytes);
ByteString sub = lit.substring(0, bytes.length);
assertTrue(not ^ lit.isValidUtf8());
assertTrue(not ^ sub.isValidUtf8());
ByteString[] ropes = {
RopeByteString.newInstanceForTest(ByteString.EMPTY, lit),
RopeByteString.newInstanceForTest(ByteString.EMPTY, sub),
RopeByteString.newInstanceForTest(lit, ByteString.EMPTY),
RopeByteString.newInstanceForTest(sub, ByteString.EMPTY),
RopeByteString.newInstanceForTest(sub, lit)
};
for (ByteString rope : ropes) {
assertTrue(not ^ rope.isValidUtf8());
}
}
private void assertValidUtf8(int... bytes) {
assertValidUtf8(bytes, false);
}
private void assertInvalidUtf8(int... bytes) {
assertValidUtf8(bytes, true);
}
private static ByteString asBytes(String s) {
return ByteString.copyFromUtf8(s);
}
public void testShardsHaveExpectedRoundTrippables() {
// A sanity check.
int actual = 0;
for (Shard shard : IsValidUtf8TestUtil.FOUR_BYTE_SHARDS) {
actual += shard.expected;
}
assertEquals(IsValidUtf8TestUtil.EXPECTED_FOUR_BYTE_ROUNDTRIPPABLE_COUNT,
actual);
}
}