Data Driven Testing by JUnit Theories

JUnit Theories是另外一種實現Data Driven Testing的方式，它的強項在於它會自動排列組合所有@DataPoint和@DataPoints的data傳入test method裡面，然後我們可以搭配Assume過濾掉一些不合理的情境。

以下是一個使用Theories的test case：

IdentificationNumberValidatorTheoriesTest

package com.gss.gmo.cao.validator.constraints.impl;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeFalse;
import static org.junit.Assume.assumeTrue;

import java.util.ArrayList;
import java.util.Collection;

import org.junit.BeforeClass;
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 IdentificationNumberValidatorTheoriesTest {

    @DataPoints
    public static DataBean[] identificationNumber;

    @BeforeClass
    public static void prepareData() {
        Collection<DataBean> data = new ArrayList<DataBean>();
        data.add(new DataBean(true, null));
        data.add(new DataBean(false, ""));
        data.add(new DataBean(false, "1qazxsw2"));
        data.add(new DataBean(true, "H120178472"));
        data.add(new DataBean(true, "h120178472"));
        data.add(new DataBean(false, "h120178470"));
        identificationNumber = data.toArray(new DataBean[] {});
    }

    private IdentificationNumberValidator identificationNumberValidator = new IdentificationNumberValidator();

    @Theory
    public void testTrue(DataBean data) {
        assumeTrue(data.isResult());
        assertTrue(identificationNumberValidator.isValid(data.getIdentificationNumber(), null));
    }

    @Theory
    public void testFalse(DataBean data) {
        assumeFalse(data.isResult());
        assertFalse(identificationNumberValidator.isValid(data.getIdentificationNumber(), null));
    }

    static class DataBean {

        private final boolean result;

        private final String identificationNumber;

        DataBean(boolean result, String identificationNumber) {
            this.result = result;
            this.identificationNumber = identificationNumber;
        }

        public boolean isResult() {
            return result;
        }

        public String getIdentificationNumber() {
            return identificationNumber;
        }

    }
}