withdatapointmethod.java

junit

package org.junit.tests.experimental.theories.runner;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.not;
import static org.hamcrest.CoreMatchers.nullValue;
import static org.junit.Assert.assertThat;
import static org.junit.experimental.results.PrintableResult.testResult;
import static org.junit.experimental.results.ResultMatchers.isSuccessful;
import static org.junit.internal.matchers.Each.each;
import static org.junit.internal.matchers.StringContains.containsString;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.hamcrest.Matcher;
import org.junit.Test;
import org.junit.experimental.theories.DataPoint;
import org.junit.experimental.theories.PotentialAssignment;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;
import org.junit.experimental.theories.internal.Assignments;
import org.junit.runner.JUnitCore;
import org.junit.runner.RunWith;
import org.junit.runner.notification.Failure;
import org.junit.runners.model.TestClass;

public class WithDataPointMethod {
	@RunWith(Theories.class)
	public static class HasDataPointMethod {
		@DataPoint
		public static int oneHundred() {
			return 100;
		}

		@Theory
		public void allIntsOk(int x) {

		}
	}

	@RunWith(Theories.class)
	public static class HasUglyDataPointMethod {
		@DataPoint
		public static int oneHundred() {
			return 100;
		}

		@DataPoint
		public static int oneUglyHundred() {
			throw new RuntimeException();
		}

		@Theory
		public void allIntsOk(int x) {

		}
	}

	@Test
	public void pickUpDataPointMethods() {
		assertThat(testResult(HasDataPointMethod.class), isSuccessful());
	}

	@Test
	public void ignoreExceptionsFromDataPointMethods() {
		assertThat(testResult(HasUglyDataPointMethod.class), isSuccessful());
	}

	@RunWith(Theories.class)
	public static class DataPointMethodReturnsMutableObject {
		@DataPoint
		public static List<Object> empty() {
			return new ArrayList<Object>();
		}

		public static int ONE= 1;

		public static int TWO= 2;

		@Theory
		public void everythingsEmpty(List<Object> first, int number) {
			assertThat(first.size(), is(0));
			first.add("a");
		}
	}

	@Test
	public void mutableObjectsAreCreatedAfresh() {
		assertThat(failures(DataPointMethodReturnsMutableObject.class), empty());
	}

	@RunWith(Theories.class)
	public static class HasDateMethod {
		@DataPoint
		public int oneHundred() {
			return 100;
		}

		public Date notADataPoint() {
			return new Date();
		}

		@Theory
		public void allIntsOk(int x) {

		}

		@Theory
		public void onlyStringsOk(String s) {

		}

		@Theory
		public void onlyDatesOk(Date d) {

		}
	}

	@Test
	public void ignoreDataPointMethodsWithWrongTypes() throws Exception {
		assertThat(potentialValues(
				HasDateMethod.class.getMethod("onlyStringsOk", String.class))
				.toString(), not(containsString("100")));
	}

	@Test
	public void ignoreDataPointMethodsWithoutAnnotation() throws Throwable {
		assertThat(potentialValues(
				HasDateMethod.class.getMethod("onlyDatesOk", Date.class))
				.size(), is(0));
	}

	private List<PotentialAssignment> potentialValues(Method method)
			throws Exception {
		return Assignments.allUnassigned(method,
				new TestClass(HasDateMethod.class))
				.potentialsForNextUnassigned();
	}

	private List<Failure> failures(Class<?> type) {
		return JUnitCore.runClasses(type).getFailures();
	}

	private Matcher<Iterable<Failure>> empty() {
		Matcher<Failure> nullValue= nullValue();
		return each(nullValue);
	}
}