google3/third_party/java_src/junit/test/java/org/junit/tests/experimental/theories/runner/WhenNoParametersMatch.java

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

import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.not;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assume.assumeThat;
import static org.junit.experimental.results.PrintableResult.testResult;

import org.hamcrest.Matcher;
import org.junit.experimental.theories.DataPoint;
import org.junit.experimental.theories.DataPoints;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;
import org.junit.runner.RunWith;

@RunWith(Theories.class)
public class WhenNoParametersMatch {
    @DataPoints
    public static int[] ints = {0, 1, 3, 5, 1776};

    @DataPoints
    public static Matcher<?>[] matchers = {not(0), is(1)};

    @RunWith(Theories.class)
    public static class AssumptionsFail {
        @DataPoint
        public static int DATA = 0;

        @DataPoint
        public static Matcher<Integer> MATCHER = null;

        @Theory
        public void nonZeroIntsAreFun(int x) {
            assumeThat(x, MATCHER);
        }
    }

    @Theory
    public void showFailedAssumptionsWhenNoParametersFound(int data,
            Matcher<Integer> matcher) throws Exception {
        assumeThat(data, not(matcher));
        AssumptionsFail.DATA = data;
        AssumptionsFail.MATCHER = matcher;

        String result = testResult(AssumptionsFail.class).toString();

        assertThat(result, containsString(matcher.toString()));
        assertThat(result, containsString("" + data));
    }
}