WithNamedDataPoints.java

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

import static org.hamcrest.CoreMatchers.containsString;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.tests.experimental.theories.TheoryTestUtils.potentialAssignments;

import java.util.List;

import org.junit.Test;
import org.junit.experimental.theories.DataPoint;
import org.junit.experimental.theories.DataPoints;
import org.junit.experimental.theories.FromDataPoints;
import org.junit.experimental.theories.PotentialAssignment;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;
import org.junit.runner.RunWith;

public class WithNamedDataPoints {

    @RunWith(Theories.class)
    public static class HasSpecificDatapointsParameters {
        
        @DataPoints
        public static String[] badStrings = new String[] { "bad" };
        
        @DataPoint
        public static String badString = "also bad";
        
        @DataPoints("named")
        public static String[] goodStrings = new String[] { "expected", "also expected" };
        
        @DataPoint("named")
        public static String goodString = "expected single value";
        
        @DataPoints("named")
        public static String[] methodStrings() {
            return new String[] { "expected method value" };
        }
        
        @DataPoint("named")
        public static String methodString() {
            return "expected single method string";
        }
        
        @DataPoints
        public static String[] otherMethod() {
            return new String[] { "other method value" };
        }
        
        @DataPoint
        public static String otherSingleValueMethod() {
            return "other single value string";
        }
        
        @Theory
        public void theory(@FromDataPoints("named") String param) {
        }
        
    }
    
    @Test
    public void onlyUseSpecificDataPointsIfSpecified() throws Throwable {
        List<PotentialAssignment> assignments = potentialAssignments(HasSpecificDatapointsParameters.class
                .getMethod("theory", String.class));
        
        assertEquals(5, assignments.size());
        for (PotentialAssignment assignment : assignments) {
            assertThat((String) assignment.getValue(), containsString("expected"));
        }
    }
    
}