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package au.id.zancanaro.javacheck.junit;
import au.id.zancanaro.javacheck.Generator;
import au.id.zancanaro.javacheck.ShrinkResult;
import au.id.zancanaro.javacheck.ShrinkTree;
import au.id.zancanaro.javacheck.annotations.Property;
import au.id.zancanaro.javacheck.annotations.Seed;
import au.id.zancanaro.javacheck.object.GeneratorProvider;
import org.junit.AssumptionViolatedException;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.Statement;
import org.junit.runners.model.TestClass;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.*;
@SuppressWarnings("WeakerAccess")
public class Properties extends BlockJUnit4ClassRunner {
private final GeneratorProvider provider;
public Properties(Class<?> classObject) throws InitializationError {
super(classObject);
provider = GeneratorProvider.DEFAULT_PROVIDER.withDataSources(classObject);
}
@Override
protected void validateConstructor(List<Throwable> errors) {
validateOnlyOneConstructor(errors);
}
@Override
protected void validateTestMethods(List<Throwable> errors) {
for (FrameworkMethod each : computeTestMethods()) {
if (each.getAnnotation(Property.class) != null) {
each.validatePublicVoid(false, errors);
each.validateNoTypeParametersOnArgs(errors);
} else {
each.validatePublicVoidNoArg(false, errors);
}
}
}
@Override
protected List<FrameworkMethod> computeTestMethods() {
List<FrameworkMethod> testMethods = new ArrayList<>(super.computeTestMethods());
List<FrameworkMethod> theoryMethods = getTestClass().getAnnotatedMethods(Property.class);
testMethods.removeAll(theoryMethods);
testMethods.addAll(theoryMethods);
return testMethods;
}
@Override
public Statement methodBlock(final FrameworkMethod method) {
return new GenerativeTester(method, getTestClass(), provider);
}
public static class GenerativeTester extends Statement {
private final FrameworkMethod testMethod;
private final TestClass testClass;
private final GeneratorProvider provider;
public GenerativeTester(FrameworkMethod testMethod, TestClass testClass, GeneratorProvider provider) {
this.testMethod = testMethod;
this.testClass = testClass;
this.provider = provider;
}
private static long getSeed(Method method) {
Seed seed = method.getAnnotation(Seed.class);
if (seed == null) {
return System.currentTimeMillis();
} else {
return seed.value();
}
}
@Override
public void evaluate() throws Throwable {
Method method = testMethod.getMethod();
if (method.getParameterCount() == 0) {
runTest(new Object[0]);
} else {
Generator<?>[] generators = Arrays.stream(method.getGenericParameterTypes())
.map(param -> provider.getGenerator(param, new Annotation[0], provider))
.toArray(Generator[]::new);
Generator<List<Object>> generator = Generator.tuple(generators);
long seed = getSeed(method);
Random random = new Random(seed);
Property property = testMethod.getAnnotation(Property.class);
int assumptionsViolated = 0;
int maxSize = property.maxSize();
int numTests = property.runs();
for (int i = 0; i < numTests; ++i) {
int size = Math.min(i + 1, maxSize);
ShrinkTree<List<Object>> tree = generator.generate(random, size);
try {
runTest(tree.getValue().toArray());
assumptionsViolated = 0;
} catch (AssumptionViolatedException ex) {
numTests++;
if (assumptionsViolated++ == 50) {
throw new Error("Violated 50 assumptions in a row: failing test", ex);
}
} catch (Throwable ex) {
throw new PropertyError(method.getName(), seed, shrink(tree, ex));
}
}
}
}
private ShrinkResult shrink(ShrinkTree<List<Object>> failed, Throwable originalEx) {
// this array is a mutable container so the shutdown handler can see the new version
ShrinkResult[] smallest = new ShrinkResult[]{
new ShrinkResult(failed.getValue(), originalEx)};
Thread shutdownHandler = makeShutdownHandler(smallest, originalEx);
Runtime.getRuntime().addShutdownHook(shutdownHandler);
Set<List<Object>> seenArgs = new HashSet<>();
Iterator<ShrinkTree<List<Object>>> trees = failed.getChildren().iterator();
while (trees.hasNext()) {
ShrinkTree<List<Object>> tree = trees.next();
List<Object> value = tree.getValue();
boolean haveSeen = seenArgs.add(Arrays.asList(value));
if (haveSeen) {
try {
runTest(value.toArray());
} catch (AssumptionViolatedException ex) {
// ignore, because it's not useful
} catch (Throwable ex) {
smallest[0] = new ShrinkResult(tree.getValue(), ex);
Iterator<ShrinkTree<List<Object>>> children = tree.getChildren().iterator();
if (children.hasNext()) {
trees = children;
} else {
break;
}
}
}
}
Runtime.getRuntime().removeShutdownHook(shutdownHandler);
return smallest[0];
}
private Thread makeShutdownHandler(ShrinkResult[] smallest, Throwable originalException) {
return new Thread(() -> {
System.err.println("Signal received while shrinking.\n" +
"Current best shrink is: " + smallest[0].args + "\n" +
"Shrinking exception: " + smallest[0].thrown + "\n" +
"Originally was: " + originalException);
});
}
public void runTest(final Object[] args) throws Throwable {
new BlockJUnit4ClassRunner(testClass.getJavaClass()) {
@Override
protected void collectInitializationErrors(List<Throwable> errors) {
// do nothing
}
@Override
public Statement methodBlock(FrameworkMethod method) {
return super.methodBlock(method);
}
@Override
protected Statement methodInvoker(FrameworkMethod method, Object test) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
method.invokeExplosively(test, args);
}
};
}
@Override
public Object createTest() throws Exception {
return getTestClass().getOnlyConstructor().newInstance();
}
}.methodBlock(testMethod).evaluate();
}
}
}
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