问题

I cannot figure out if it is a missing feature, see the JUnit issue 1154 and my comment there, or just my inability to write properly the syntax for name of the @ParameterizedTest in JUnit5. Given the fact that issue has been open for the last 3 years, I'm afraid I cannot wait till I get the answer or even the implementation there, so I'm trying to ask here as well.

In my example ParameterizedTest, I'm using @MethodSource, which returns a Stream of int arrays, and I would like to use only those array's attributes instead of all {arguments}, which is anyway the same if I use {0}. Hard to explain verbally here, better to use the code example below.

package net.delphym.unittests;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

import java.util.stream.Stream;

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

class DynamicTestCreationTestParam {
    private static Stream<int[]> data() {
        return Stream.of(new int[][]{{1, 2, 2}, {5, 3, 15}, {121, 4, 484}});
    }

    @DisplayName("Multiplication test")
    @ParameterizedTest(name = "#{index} for {arguments}: {0} x {1} = {2}")
    @MethodSource("data")
    void testWithStringParameter(int[] data) {
        MyClass tester = new MyClass();
        int m1 = data[0];
        int m2 = data[1];
        int expected = data[2];
        assertEquals(expected, tester.multiply(m1, m2));
    }

    // class to be tested
    class MyClass {
        public int multiply(int i, int j) {
            return i * j;
        }
    }
}

The test results output looks something like this for the 1st run: #1 for [1, 2, 2]: [1, 2, 2] x {1} = {2}

Ideally, I would like to see this: #1 multiply: 1 x 2 = 2.

So the question is, what would be the @ParameterizedTest(name) definition to match my expectation?

I was trying something like this:
name = "#{index} multiply : {[0][0]} x {[0][1]} = {[0][2]}",
But it is syntactically incorrect.

package net.delphym.unittests;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

import java.util.stream.Stream;

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

class DynamicTestCreationTestParam {
	private static Stream<int[]> data() {
		return Stream.of(new int[][] { {1, 2, 2}, {5, 3, 15}, {121, 4, 484} });
	}

	@DisplayName("Multiplication test")
	@ParameterizedTest(name = "#{index} for {arguments}: {0} x {1} = {2}")
	@MethodSource("data")
	void testWithStringParameter(int[] data) {
		MyClass tester = new MyClass();
		int m1 = data[0];
		int m2 = data[1];
		int expected = data[2];
		assertEquals(expected, tester.multiply(m1, m2));
	}

	// class to be tested
	class MyClass {
		public int multiply(int i, int j) {
			return i *j;
		}
	}
}

答案1

得分: 1

以下是您要翻译的内容：

"Alright, as suggested by @Murat Karagöz, I'm only reposting suggestions which I receive on Github to have all at one place.

In my opinion, without no doubt, those elegant solutions are only workarounds to the JUnit5 @ParameterizedTest API limitations, but they both satisfied my needs.

Proposed workaround #1 if I don't need to use int[]

Solution presented here is preserving @MethodSource("data") and only altering its return type. Now the data() method returns Stream of Arguments objects (3 in each), instead Stream of int arrays (of 3 in each).

Then the code reads:

private static Stream<Arguments> data() {
	return Stream.of(Arguments.of(1, 2, 2), Arguments.of(5, 3, 15), Arguments.of(121, 4, 484));
}

@DisplayName("Multiplication test")
@ParameterizedTest(name = "#{index}: {0} x {1} = {2}")
@MethodSource("data")
void testWithStringParameter(int m1, int m2, int expected) {
	MyClass tester = new MyClass();
	assertEquals(expected, tester.multiply(m1, m2));
}

Credits goes to Marc Philipp for his post @ Github.

Proposed workaround #2 to unroll test data to match display needs##

This solution provided by sormarus suggest to use @CsvSource instead of the @MethodSource and provides the set of the test data within the annotation.

I like this as a simple example of how to quickly prepare the same basic variation without the need to have a specific data generating method.

The code looks like this:

	@DisplayName("Multiplication test")
	@ParameterizedTest(name = "#{index} multiply: {0} x {1} = {2}")
	@CsvSource({"1,2,2", "3,5,15", "121,4,484"})
	void testWithStringParameter(int m1, int m2, int expected) {
		MyClass tester = new MyClass();
		assertEquals(expected, tester.multiply(m1, m2));
	}

请注意，由于代码中包含特殊字符和代码标记，因此可能无法进行完美的翻译，但我已尽力翻译了文本部分。

private static Stream<Arguments> data() {
	return Stream.of(Arguments.of(1, 2, 2), Arguments.of(5, 3, 15), Arguments.of(121, 4, 484));
}

@DisplayName("Multiplication test")
@ParameterizedTest(name = "#{index}: {0} x {1} = {2}")
@MethodSource("data")
void testWithStringParameter(int m1, int m2, int expected) {
	MyClass tester = new MyClass();
	assertEquals(expected, tester.multiply(m1, m2));
}

	@DisplayName("Multiplication test")
	@ParameterizedTest(name = "#{index} multiply: {0} x {1} = {2}")
	@CsvSource({"1,2,2", "3,5,15", "121,4,484"})
	void testWithStringParameter(int m1, int m2, int expected) {
		MyClass tester = new MyClass();
		assertEquals(expected, tester.multiply(m1, m2));
	}