了解测试套件

Question

我正在学习 scalatest，对套件有疑问。我想测试一个

class ByteSource(val src: Array[Byte])

从逻辑上讲，我将测试用例分为以下两个：

空字节源
非空字节源

问题是像这样将案例分成不同的套件是否正确：

class ByteSourceTest extends FunSpec with Matchers{
    describe("empty byte source operations"){
        //...
    }

    describe("non-empty byte source operations"){
        //...
    }
}

或者FunSpec不太适合这种情况？

Answer 1

FunSpec 旨在提供最小结构，因此这里没有硬性规定。自以为是的结构的一个例子是 WordSpec。我会提出的一个建议是通过使用外部 describe("A ByteSource"):

来清楚地识别测试的主题

class ByteSourceTest extends FunSpec with Matchers {
  describe("A ByteSource") {
    describe("when empty") {
      val byteSource = new ByteSource(new Array[Byte](0))

      it("should have size 0") {
        assert(byteSource.src.size == 0)
      }

      it("should produce NoSuchElementException when head is invoked") {
        assertThrows[NoSuchElementException] {
          byteSource.src.head
        }
      }
    }

    describe("when non-empty") {
      val byteSource = new ByteSource(new Array[Byte](10))

      it("should have size > 0") {
        assert(byteSource.src.size > 0)
      }

      it("should not produce NoSuchElementException when head is invoked") {
        noException shouldBe thrownBy {
          byteSource.src.head
        }
      }
    }
  }
}

让测试对象的输出看起来像自然语言的规范：

A ByteSource
  when empty
  - should have size 0
  - should produce NoSuchElementException when head is invoked
  when non-empty
  - should have size > 0
  - should not produce NoSuchElementException when head is invoked

了解测试套件

Understanding test suites

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scala

scalatest