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package au.id.zancanaro;
import au.id.zancanaro.annotations.Property;
import au.id.zancanaro.annotations.Seed;
import junit.framework.AssertionFailedError;
import org.junit.AssumptionViolatedException;
import org.junit.runner.Description;
import org.junit.runner.Runner;
import org.junit.runner.notification.Failure;
import org.junit.runner.notification.RunNotifier;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
public class PropertyTestRunner extends Runner {
private final Class<?> classUnderTest;
public PropertyTestRunner(Class<?> classUnderTest) {
this.classUnderTest = classUnderTest;
}
@Override
public Description getDescription() {
return Description.createSuiteDescription(classUnderTest);
}
private long getSeed(Method method) {
Seed seed = method.getAnnotation(Seed.class);
if (seed == null) {
return System.currentTimeMillis();
} else {
return seed.value();
}
}
@Override
public void run(RunNotifier notifier) {
Method[] methods = classUnderTest.getMethods();
for (Method method : methods) {
Property details = method.getAnnotation(Property.class);
if (details != null) {
Description description = Description.createTestDescription(classUnderTest, method.getName());
boolean failed = false;
int assumptionsFailed = 0;
long seed = getSeed(method);
Random random = new Random(seed);
int numRuns = details.runs();
for (int i = 0; i < numRuns && !failed; ++i) {
int size = details.size();
notifier.fireTestStarted(description);
Object obj;
try {
obj = classUnderTest.getConstructor().newInstance();
} catch (Throwable ex) { // HACKY
System.out.println(ex);
return;
}
RoseTree<Object[]> generated = generateArgs(random, size,
method.getGenericParameterTypes(),
method.getParameterAnnotations());
try {
method.invoke(obj, generated.getValue());
} catch (InvocationTargetException ex) {
if (ex.getTargetException() instanceof AssumptionViolatedException) {
assumptionsFailed++;
} else {
notifier.fireTestFailure(new Failure(description, ex.getTargetException()));
System.out.println("Test failed with seed: " + seed);
System.out.println("Failing arguments: " + Arrays.asList(generated.getValue()));
Object[] shrinkResult = shrink(method, obj, generated);
if (shrinkResult == null) {
System.out.println("Arguments could not be shrunk any further");
} else {
System.out.println("Arguments shrunk to: " + Arrays.asList(shrinkResult));
}
failed = true;
}
} catch (IllegalAccessException ex) {
notifier.fireTestFailure(new Failure(description, ex));
failed = true;
}
}
if (assumptionsFailed > 0) {
System.out.println("Failed " + assumptionsFailed + " assumptions");
}
notifier.fireTestFinished(description);
}
}
}
private Object[] shrink(Method method, Object obj, RoseTree<Object[]> failed) {
Object[] smallest = failed.getValue();
Iterator<RoseTree<Object[]>> trees = failed.getChildren();
while (trees.hasNext()) {
RoseTree<Object[]> tree = trees.next();
try {
method.invoke(obj, tree.getValue());
} catch (Throwable ex) {
Iterator<RoseTree<Object[]>> children = tree.getChildren();
if (children.hasNext()) {
trees = children;
}
smallest = tree.getValue();
}
}
return smallest;
}
private <T> String printShrinkTree(RoseTree<T[]> generated) {
StringBuilder builder = new StringBuilder();
builder.append('(');
builder.append(Arrays.toString(generated.getValue()));
generated.getChildren().forEachRemaining((child) -> {
builder.append(' ');
builder.append(printShrinkTree(child));
});
builder.append(')');
return builder.toString();
}
private RoseTree<Object[]> generateArgs(Random random, int size, Type[] types, Annotation[][] annotations) {
Generator<?>[] generators = new Generator[types.length];
for (int i = 0; i < types.length; ++i) {
// generators[i] = getGeneratorFromAnnotations(annotations[i]);
// if (generators[i] == null) {
generators[i] = getGeneratorFromType(types[i]);
// }
}
return Generators.arrayGenerator(generators).generate(random, size);
}
private Generator<?> getGeneratorFromType(Type type) {
if (type instanceof Class) {
Class<?> clazz = (Class<?>) type;
if (clazz.isPrimitive() && clazz == Integer.TYPE) {
return Generators.integerGenerator();
} else {
throw new RuntimeException("Unknown type for generator (atm only int is supported)");
}
} else {
throw new RuntimeException("Unknown type for generator (atm only int is supported)");
}
}
}
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