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/*
* Copyright 2023 Code Intelligence GmbH
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.code_intelligence.jazzer.mutation.mutator.lang;
import static com.code_intelligence.jazzer.mutation.mutator.lang.StringMutatorFactory.fixUpAscii;
import static com.code_intelligence.jazzer.mutation.mutator.lang.StringMutatorFactory.fixUpUtf8;
import static com.code_intelligence.jazzer.mutation.support.TestSupport.mockPseudoRandom;
import static com.google.common.truth.Truth.assertThat;
import com.code_intelligence.jazzer.mutation.annotation.NotNull;
import com.code_intelligence.jazzer.mutation.annotation.WithUtf8Length;
import com.code_intelligence.jazzer.mutation.api.SerializingMutator;
import com.code_intelligence.jazzer.mutation.mutator.libfuzzer.LibFuzzerMutator;
import com.code_intelligence.jazzer.mutation.support.RandomSupport;
import com.code_intelligence.jazzer.mutation.support.TestSupport.MockPseudoRandom;
import com.code_intelligence.jazzer.mutation.support.TypeHolder;
import com.google.protobuf.ByteString;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.SplittableRandom;
import org.junit.jupiter.api.*;
class StringMutatorTest {
/**
* Some tests may set {@link LibFuzzerMutator#MOCK_SIZE_KEY} which can interfere with other tests
* unless cleared.
*/
@AfterEach
void cleanMockSize() {
System.clearProperty(LibFuzzerMutator.MOCK_SIZE_KEY);
}
@RepeatedTest(10)
void testFixAscii_randomInputFixed(RepetitionInfo info) {
SplittableRandom random = new SplittableRandom(
(long) "testFixAscii_randomInputFixed".hashCode() * info.getCurrentRepetition());
for (int length = 0; length < 1000; length++) {
byte[] randomBytes = generateRandomBytes(random, length);
byte[] copy = Arrays.copyOf(randomBytes, randomBytes.length);
fixUpAscii(copy);
if (isValidAscii(randomBytes)) {
assertThat(copy).isEqualTo(randomBytes);
} else {
assertThat(isValidAscii(copy)).isTrue();
}
}
}
@RepeatedTest(10)
void testFixAscii_validInputNotChanged(RepetitionInfo info) {
SplittableRandom random = new SplittableRandom(
(long) "testFixAscii_validInputNotChanged".hashCode() * info.getCurrentRepetition());
for (int codePoints = 0; codePoints < 1000; codePoints++) {
byte[] validAscii = generateValidAsciiBytes(random, codePoints);
byte[] copy = Arrays.copyOf(validAscii, validAscii.length);
fixUpAscii(copy);
assertThat(copy).isEqualTo(validAscii);
}
}
@RepeatedTest(20)
void testFixUtf8_randomInputFixed(RepetitionInfo info) {
SplittableRandom random = new SplittableRandom(
(long) "testFixUtf8_randomInputFixed".hashCode() * info.getCurrentRepetition());
for (int length = 0; length < 1000; length++) {
byte[] randomBytes = generateRandomBytes(random, length);
byte[] copy = Arrays.copyOf(randomBytes, randomBytes.length);
fixUpUtf8(copy);
if (isValidUtf8(randomBytes)) {
assertThat(copy).isEqualTo(randomBytes);
} else {
assertThat(isValidUtf8(copy)).isTrue();
}
}
}
@RepeatedTest(20)
void testFixUtf8_validInputNotChanged(RepetitionInfo info) {
SplittableRandom random = new SplittableRandom(
(long) "testFixUtf8_validInputNotChanged".hashCode() * info.getCurrentRepetition());
for (int codePoints = 0; codePoints < 1000; codePoints++) {
byte[] validUtf8 = generateValidUtf8Bytes(random, codePoints);
byte[] copy = Arrays.copyOf(validUtf8, validUtf8.length);
fixUpUtf8(copy);
assertThat(copy).isEqualTo(validUtf8);
}
}
@Test
void testMinLengthInit() {
SerializingMutator<String> mutator =
(SerializingMutator<String>) LangMutators.newFactory().createOrThrow(
new TypeHolder<@NotNull @WithUtf8Length(min = 10) String>() {}.annotatedType());
assertThat(mutator.toString()).isEqualTo("String");
try (MockPseudoRandom prng = mockPseudoRandom(5)) {
// mock prng should throw an assert error when given a lower value than min
Assertions.assertThrows(AssertionError.class, () -> { String s = mutator.init(prng); });
}
}
@Test
void testMaxLengthInit() {
SerializingMutator<String> mutator =
(SerializingMutator<String>) LangMutators.newFactory().createOrThrow(
new TypeHolder<@NotNull @WithUtf8Length(max = 50) String>() {}.annotatedType());
assertThat(mutator.toString()).isEqualTo("String");
try (MockPseudoRandom prng = mockPseudoRandom(60)) {
// mock prng should throw an assert error when given a value higher than max
Assertions.assertThrows(AssertionError.class, () -> { String s = mutator.init(prng); });
}
}
@Test
void testMinLengthMutate() {
SerializingMutator<String> mutator =
(SerializingMutator<String>) LangMutators.newFactory().createOrThrow(
new TypeHolder<@NotNull @WithUtf8Length(min = 10) String>() {}.annotatedType());
assertThat(mutator.toString()).isEqualTo("String");
String s;
try (MockPseudoRandom prng = mockPseudoRandom(10, "foobarbazf".getBytes())) {
s = mutator.init(prng);
}
assertThat(s).isEqualTo("foobarbazf");
System.setProperty(LibFuzzerMutator.MOCK_SIZE_KEY, "5");
try (MockPseudoRandom prng = mockPseudoRandom()) {
s = mutator.mutate(s, prng);
}
assertThat(s).isEqualTo("gqrff\0\0\0\0\0");
}
@Test
void testMaxLengthMutate() {
SerializingMutator<String> mutator =
(SerializingMutator<String>) LangMutators.newFactory().createOrThrow(
new TypeHolder<@NotNull @WithUtf8Length(max = 15) String>() {}.annotatedType());
assertThat(mutator.toString()).isEqualTo("String");
String s;
try (MockPseudoRandom prng = mockPseudoRandom(10, "foobarbazf".getBytes())) {
s = mutator.init(prng);
}
assertThat(s).isEqualTo("foobarbazf");
System.setProperty(LibFuzzerMutator.MOCK_SIZE_KEY, "20");
try (MockPseudoRandom prng = mockPseudoRandom()) {
Assertions.assertThrows(
ArrayIndexOutOfBoundsException.class, () -> { String s2 = mutator.mutate(s, prng); });
}
}
@Test
void testMultibyteCharacters() {
SerializingMutator<String> mutator =
(SerializingMutator<String>) LangMutators.newFactory().createOrThrow(
new TypeHolder<@NotNull @WithUtf8Length(min = 10) String>() {}.annotatedType());
assertThat(mutator.toString()).isEqualTo("String");
String s;
try (
MockPseudoRandom prng = mockPseudoRandom(10, "foobarÖÖ".getBytes(StandardCharsets.UTF_8))) {
s = mutator.init(prng);
}
assertThat(s).hasLength(8);
assertThat(s).isEqualTo("foobarÖÖ");
}
private static boolean isValidUtf8(byte[] data) {
return ByteString.copyFrom(data).isValidUtf8();
}
private static boolean isValidAscii(byte[] data) {
for (byte b : data) {
if ((b & 0xFF) > 0x7F) {
return false;
}
}
return true;
}
private static byte[] generateRandomBytes(SplittableRandom random, int length) {
byte[] bytes = new byte[length];
RandomSupport.nextBytes(random, bytes);
return bytes;
}
private static byte[] generateValidAsciiBytes(SplittableRandom random, int length) {
return random.ints(0, 0x7F)
.limit(length)
.collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
.toString()
.getBytes(StandardCharsets.UTF_8);
}
private static byte[] generateValidUtf8Bytes(SplittableRandom random, long codePoints) {
return random.ints(0, Character.MAX_CODE_POINT + 1)
.filter(code -> code < Character.MIN_SURROGATE || code > Character.MAX_SURROGATE)
.limit(codePoints)
.collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
.toString()
.getBytes(StandardCharsets.UTF_8);
}
}
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