java - 在 JUnit 5 参数化测试中。 CSV 输入。有没有办法通过 Double.NaN、Double.POSITIVE_INFINITY？

Question

我想通过 Double.NEGATIVE_INFINITY , Double.POSITIVE_INFINITY和 Double.NaN作为 JUnit5 中的 CSV 参数:

@DisplayName("Testing ActivationFunction.heaviside")
@ParameterizedTest(name = "Testing ActivationFunction.heaviside ({0},{1})")
@CsvSource({
    "Double.NEGATIVE_INFINITY, 0",
    "-100, 0",
    "-1, 0",
    "0, 0.5",
    "1, 1",
    "100, 1",
    "Double.POSITIVE_INFINITY, 0",
    "Double.NaN, Double.NaN"
})
void testActivationFunction_heaviside(double input, double output) {

    assertEquals(output, ActivationFunction.heaviside(input));

}

不幸的是，它会在 JUnit5 测试运行器中触发诸如“ Error converting parameter at index 0: Failed to convert String "Double.POSITIVE_INFINITY" to type java.lang.Double”之类的错误。
有没有好的方法可以自动传递这些值进行测试，或者我只需编写一个单独的测试方法，如下所示:

assertEquals(0, Double.NEGATIVE_INFINITY);
assertEquals(1, Double.POSITIVE_INFINITY);
assertEquals(Double.NaN, Double.NaN);

Answer 1

正如错误所暗示的那样，JUnit 无法将源值转换为 double类型。 Double.NEGATIVE_INFINITY是 Double 类的静态最终成员。您不能在 CsvSource 中传递变量名.但是，您要做的是通过 String 重新表示它。
来自 Java 文档:

• If the argument is NaN, the result is the string "NaN".
• If m is infinity, it is represented by the string "Infinity"; thus, positive infinity produces the result "Infinity" and negative infinity produces the result "-Infinity".

因此，您可以按如下方式重新建模您的代码:

@DisplayName("Testing ActivationFunction.heaviside")
@ParameterizedTest(name = "Testing ActivationFunction.heaviside ({0},{1})")
@CsvSource({
    "-Infinity, 0",
    "-100, 0",
    "-1, 0",
    "0, 0.5",
    "1, 1",
    "100, 1",
    "Infinity, 0",
    "NaN, NaN"
})
void testActivationFunction_heaviside(double input, double output) {
    System.out.println(input + " :: "+output);
}