我应该如何测试Kotlin扩展功能? [英] How should I test Kotlin extension functions?

问题描述

有人可以告诉我如何在Kotlin中对扩展功能进行单元测试吗?由于它们是静态解析的，应该将它们作为静态方法调用还是作为非静态方法进行测试?另外，由于语言可以与Java完全互操作，因此应该如何对Kotlin扩展功能执行Java单元测试?

Can somebody tell me how should I unit-test extension functions in Kotlin? Since they are resolved statically should they be tested as static method calls or as non static ? Also since language is fully interoperable with Java, how Java unit test for Kotlin extension functions should be performed ?

推荐答案

好，要测试一种方法(无论是否静态)，请像实际代码一样调用它，然后检查它是否做对了.

Well, to test a method, whether static or not, you call it as real code would do, and you check that it does the right thing.

例如，假设此扩展方法在com/foo/Bar.kt文件中定义:

Assuming this extension method, for example, is defined in the file com/foo/Bar.kt:

fun String.lengthPlus1(): Int {
    return this.length + 1
}

如果您使用Kotlin编写测试(通常会用来测试Kotlin代码)，那么您将编写

If you write your test in Kotlin (which you would typically do to test Kotlin code), you would write

assertThat("foo".lengthPlus1()).isEqualTo(4);

如果您使用Java编写(但是为什么要这么做?)

If you write it in Java (but why would you do that?)

assertThat(BarKt.lengthPlus1("foo")).isEqualTo(4);

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