java - Junit 参数化输入和断言

Question

当只有输入/断言值不同时，我有类似的测试:

@Test
void test1() {
    // Given:
    val request = Request
            .builder()
            .totalAmount(new BigDecimal("160000"))
            .termInYears(20)
            .familySize(2)
            .incomeAmount(new BigDecimal("4000"))
            .costOfLiving(BigDecimal.ZERO)
            .build();

    // When:
    Result result =
            facade.getLoanAmount(request);

    // Then:
    result.getSimulations().forEach(simulation -> {
        if(simulation.getVariantCode().equals(Variant.A)) {
            assertThat(simulation.getInstallmentAmount().compareTo(new BigDecimal("720")) == 0);
            assertThat(simulation.getInterestRate().compareTo(new BigDecimal("0.0321")) == 0);
            assertThat(simulation.getLoanAmount().compareTo(new BigDecimal("127390")) == 0);
            assertThat(simulation.getNumberOfInstallmentsInMonths() == 240);
        } if(simulation.getVariantCode().equals(Variant.B)) {
            assertThat(simulation.getInstallmentAmount().compareTo(new BigDecimal("720")) == 0);
            assertThat(simulation.getInterestRate().compareTo(new BigDecimal("0.0321")) == 0);
            assertThat(simulation.getLoanAmount().compareTo(new BigDecimal("127390")) == 0);
            assertThat(simulation.getNumberOfInstallmentsInMonths() == 240);
        } if(simulation.getVariantCode().equals(Variant.C)) {
            assertThat(simulation.getInstallmentAmount().compareTo(new BigDecimal("720")) == 0);
            assertThat(simulation.getInterestRate().compareTo(new BigDecimal("0.0321")) == 0);
            assertThat(simulation.getLoanAmount().compareTo(new BigDecimal("127390")) == 0);
            assertThat(simulation.getNumberOfInstallmentsInMonths() == 240);
        }
    });
}

@Test
void test2() {
    // Given:
    val request = Request
            .builder()
            .totalAmount(new BigDecimal("200000"))
            .termInYears(20)
            .familySize(2)
            .incomeAmount(new BigDecimal("4000"))
            .costOfLiving(BigDecimal.ZERO)
            .build();

    // When:
    Result result =
            facade.getLoanAmount(request);

    // Then:
    result.getSimulations().forEach(simulation -> {
        if(simulation.getVariantCode().equals(Variant.A)) {
            assertThat(simulation.getInstallmentAmount().compareTo(new BigDecimal("720")) == 0);
            assertThat(simulation.getInterestRate().compareTo(new BigDecimal("0.0321")) == 0);
            assertThat(simulation.getLoanAmount().compareTo(new BigDecimal("127390")) == 0);
            assertThat(simulation.getNumberOfInstallmentsInMonths() == 240);
        } if(simulation.getVariantCode().equals(Variant.B)) {
            assertThat(simulation.getInstallmentAmount().compareTo(new BigDecimal("720")) == 0);
            assertThat(simulation.getInterestRate().compareTo(new BigDecimal("0.0321")) == 0);
            assertThat(simulation.getLoanAmount().compareTo(new BigDecimal("127390")) == 0);
            assertThat(simulation.getNumberOfInstallmentsInMonths() == 240);
        } if(simulation.getVariantCode().equals(Variant.C)) {
            assertThat(simulation.getInstallmentAmount() == null);
            assertThat(simulation.getInterestRate() == null);
            assertThat(simulation.getLoanAmount()== null);
            assertThat(simulation.getNumberOfInstallmentsInMonths() == 240);
        }
    });
}

这段代码工作正常，但我想知道如何更好地编写这段代码。我知道有 @ParameterizedTest 但我不确定这会减少这种情况下的代码行以及如何在那里提供输入/输出？最好的方法是什么？我必须编写更多这样的测试，所以我认为为许多测试提供输入/输出会很好。在 Spock 中，这将是一个不错的表，但我必须使用另一个工具。

Answer 1

如果您使用 JUnit 5(4 中的 ParameterizedTests 非常不同，但也使其成为可能)，类似这样的事情应该可以工作:

@ParameterizedTest
@MethodSource("arguments")
void test(Request input, BigDecimal result) {
 // ...
}

public static Stream<Arguments> arguments() {
    r1 = Request.builder().build(); // add request configuration here
    r2 = Request.builder().build(); // ... and here
    return Stream.of(
       Arguments.of(r1, new BigDecimal("720")),
       Arguments.of(r2, null)
    );
}