Implement Table Driven Test in Java 14

Introduction

Java 14 has finally been released, so The source code introduced in the previous Implementing Table Driven Test in Java, I rewrote it using Records added as a Preview in Java 14.

Table Driven Test before Java 14

In the previous source code I kept the test cases in an inner class called TestCase. Constructors and getters were defined using Lombok.

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.experimental.Accessors;
import org.junit.jupiter.api.*;

import java.util.stream.Stream;

import static org.junit.jupiter.api.Assertions.assertEquals;

class MathTest {

    @Nested
    static class Pow {

        @AllArgsConstructor
        @Getter
        @Accessors(fluent = true)
        static class TestCase {
            private String name;
            private double x;
            private double y;
            private double expected;
        }

        @TestFactory
        Stream<DynamicNode> testPow() {
            return Stream.of(
                    new TestCase("pow(2,1)", 2, 1, 2),
                    new TestCase("pow(2,2)", 2, 2, 4),
                    new TestCase("pow(2,3)", 2, 3, 8),
                    new TestCase("pow(2,0)", 2, 0, 1),
                    new TestCase("pow(2,-1)", 2, -1, 0.5),
                    new TestCase("pow(2,+Inf)", 2, Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY),
                    new TestCase("pow(2,-Inf)", 2, Double.NEGATIVE_INFINITY, 0),
                    new TestCase("pow(+Inf,2)", Double.POSITIVE_INFINITY, 2, Double.POSITIVE_INFINITY),
                    new TestCase("pow(-Inf,2)", Double.NEGATIVE_INFINITY, 2, Double.POSITIVE_INFINITY)
            ).map(testCase -> DynamicTest.dynamicTest(
                    testCase.name(),
                    () -> {
                        double result = Math.pow(testCase.x(), testCase.y());
                        assertEquals(testCase.expected(), result);
                    })
            );
        }
    }

}

Java 14 Table Driven Test

In this source code, Changed to keep test cases in record. By using record, I was able to reduce the amount of code compared to using Lombok.

import org.junit.jupiter.api.DynamicNode;
import org.junit.jupiter.api.DynamicTest;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.TestFactory;

import java.util.stream.Stream;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class MathTest {

    @Nested
    static class Pow {

        record TestCase(String name, double x, double y, double expected) {
        }

        @TestFactory
        Stream<DynamicNode> testPow() {
            return Stream.of(
                    new TestCase("pow(2,1)", 2, 1, 2),
                    new TestCase("pow(2,2)", 2, 2, 4),
                    new TestCase("pow(2,3)", 2, 3, 8),
                    new TestCase("pow(2,0)", 2, 0, 1),
                    new TestCase("pow(2,-1)", 2, -1, 0.5),
                    new TestCase("pow(2,+Inf)", 2, Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY),
                    new TestCase("pow(2,-Inf)", 2, Double.NEGATIVE_INFINITY, 0),
                    new TestCase("pow(+Inf,2)", Double.POSITIVE_INFINITY, 2, Double.POSITIVE_INFINITY),
                    new TestCase("pow(-Inf,2)", Double.NEGATIVE_INFINITY, 2, Double.POSITIVE_INFINITY)
            ).map(testCase -> DynamicTest.dynamicTest(
                    testCase.name(),
                    () -> {
                        double result = Math.pow(testCase.x(), testCase.y());
                        assertEquals(testCase.expected(), result);
                    })
            );
        }
    }

}

Summary

We hope that you will continue to improve the source code using new features.