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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.support;
import static com.code_intelligence.jazzer.mutation.support.Preconditions.requireNonNullElements;
import static com.google.common.truth.Truth.assertThat;
import static java.util.Arrays.stream;
import static java.util.stream.Collectors.toCollection;
import com.code_intelligence.jazzer.mutation.api.Debuggable;
import com.code_intelligence.jazzer.mutation.api.PseudoRandom;
import com.code_intelligence.jazzer.mutation.api.SerializingMutator;
import com.code_intelligence.jazzer.mutation.engine.SeededPseudoRandom;
import com.google.errorprone.annotations.CheckReturnValue;
import com.google.errorprone.annotations.MustBeClosed;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.OutputStream;
import java.util.ArrayDeque;
import java.util.List;
import java.util.Queue;
import java.util.function.Function;
import java.util.function.Predicate;
public final class TestSupport {
private static final DataOutputStream nullDataOutputStream =
new DataOutputStream(new OutputStream() {
@Override
public void write(int i) {}
});
private TestSupport() {}
public static DataOutputStream nullDataOutputStream() {
return nullDataOutputStream;
}
/**
* Deterministically creates a new instance of {@link PseudoRandom} whose exact behavior is
* intentionally unspecified.
*/
// TODO: Turn usages of this function into fuzz tests.
public static PseudoRandom anyPseudoRandom() {
// Change this seed from time to time to shake out tests relying on hardcoded behavior.
return new SeededPseudoRandom(8853461259049838337L);
}
/**
* Creates a {@link PseudoRandom} whose methods return the given values in order.
*/
@MustBeClosed
public static MockPseudoRandom mockPseudoRandom(Object... returnValues) {
return new MockPseudoRandom(returnValues);
}
@CheckReturnValue
public static <T> SerializingMutator<T> mockMutator(T initialValue, Function<T, T> mutate) {
return new SerializingMutator<T>() {
@Override
public T read(DataInputStream in) {
return initialValue;
}
@Override
public void write(T value, DataOutputStream out) {
throw new UnsupportedOperationException("mockMutator does not support write");
}
@Override
public T init(PseudoRandom prng) {
return initialValue;
}
@Override
public T mutate(T value, PseudoRandom prng) {
return mutate.apply(value);
}
@Override
public String toDebugString(Predicate<Debuggable> isInCycle) {
if (initialValue == null) {
return "null";
}
return initialValue.getClass().getSimpleName();
}
@Override
public T detach(T value) {
return value;
}
};
}
public static final class MockPseudoRandom implements PseudoRandom, AutoCloseable {
private final Queue<Object> elements;
private MockPseudoRandom(Object... objects) {
requireNonNullElements(objects);
this.elements = stream(objects).collect(toCollection(ArrayDeque::new));
}
@Override
public boolean choice() {
assertThat(elements).isNotEmpty();
return (boolean) elements.poll();
}
@Override
public boolean trueInOneOutOf(int inverseFrequencyTrue) {
assertThat(inverseFrequencyTrue).isAtLeast(2);
assertThat(elements).isNotEmpty();
return (boolean) elements.poll();
}
@Override
public <T> int indexIn(T[] array) {
assertThat(array).isNotEmpty();
assertThat(elements).isNotEmpty();
return (int) elements.poll();
}
@Override
public <T> int indexIn(List<T> list) {
assertThat(list).isNotEmpty();
assertThat(elements).isNotEmpty();
return (int) elements.poll();
}
@Override
public int indexIn(int range) {
assertThat(range).isAtLeast(2);
assertThat(elements).isNotEmpty();
return (int) elements.poll();
}
@Override
public <T> int otherIndex(T[] array, int currentIndex) {
assertThat(array.length).isAtLeast(2);
assertThat(currentIndex).isAtLeast(0);
assertThat(currentIndex).isLessThan(array.length);
assertThat(elements).isNotEmpty();
int nextIndex = (int) elements.poll();
assertThat(nextIndex).isNotEqualTo(currentIndex);
return nextIndex;
}
@Override
public int closedRange(int lowerInclusive, int upperInclusive) {
assertThat(lowerInclusive).isLessThan(upperInclusive);
assertThat(elements).isNotEmpty();
int result = (int) elements.poll();
assertThat(result).isAtLeast(lowerInclusive);
assertThat(result).isAtMost(upperInclusive);
return result;
}
@Override
public long closedRange(long lowerInclusive, long upperInclusive) {
assertThat(lowerInclusive).isLessThan(upperInclusive);
assertThat(elements).isNotEmpty();
long result = (long) elements.poll();
assertThat(result).isAtLeast(lowerInclusive);
assertThat(result).isAtMost(upperInclusive);
return result;
}
@Override
public void bytes(byte[] bytes) {
assertThat(elements).isNotEmpty();
byte[] result = (byte[]) elements.poll();
assertThat(result).hasLength(bytes.length);
System.arraycopy(result, 0, bytes, 0, bytes.length);
}
@Override
public void close() {
assertThat(elements).isEmpty();
}
}
}
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