英文:
Ginkgo/Gomega Panic Test Fails
问题
我正在写一个测试来断言一个函数在无效输入时会发生 panic，但是 Ginkgo 将 panic 记录为失败，而不是预期的通过结果。
func ParseUnixTimeString(unixTimeString string) time.Time {i, err := strconv.ParseInt(unixTimeString, 10, 64)if err != nil {panic(fmt.Sprintf("could not parse time: %s", err.Error()))}return time.Unix(i, 0)}func TestFormat(t *testing.T) {gomega.RegisterFailHandler(ginkgo.Fail)ginkgo.RunSpecs(t, "Format Suite")}var _ = ginkgo.Describe("Format Tests", func() {ginkgo.Describe("When formatting the date", func() {ginkgo.It("should panic if the time can't be formatted", func() {gomega.Expect(tools.ParseUnixTimeString("2314321432143124223432434")).To(gomega.Panic())})})})
返回结果（简化）：
•! [PANICKED] [0.002 秒][It] should panic if the time can't be formatted测试发生了 Paniccould not parse time: strconv.ParseInt: parsing "2314321432143124223432434": value out of range在 0.002 秒内运行了 1 个 SpecFAIL! -- 0 通过 | 1 失败 | 0 待定 | 0 跳过
如何在 Ginkgo/Gomega 中正确测试 panic？
英文:
I'm writing a test to assert that a function panics on invalid input, but Ginkgo records the panic as a failure instead of a passing result as expected.
func ParseUnixTimeString(unixTimeString string) time.Time {i, err := strconv.ParseInt(unixTimeString, 10, 64)if err != nil {panic(fmt.Sprintf("could not parse time: %s", err.Error()))}return time.Unix(i, 0)}func TestFormat(t *testing.T) {gomega.RegisterFailHandler(ginkgo.Fail)ginkgo.RunSpecs(t, "Format Suite")}var _ = ginkgo.Describe("Format Tests", func() {ginkgo.Describe("When formatting the date", func() {ginkgo.It("should panic if the time can't be formatted", func() {gomega.Expect(tools.ParseUnixTimeString("2314321432143124223432434")).To(gomega.Panic())})})
Which returns (condensed):
•! [PANICKED] [0.002 seconds][It] should panic if the time can't be formattedTest Panickedcould not parse time: strconv.ParseInt: parsing "2314321432143124223432434": value out of rangeRan 1 of 1 Specs in 0.002 secondsFAIL! -- 0 Passed | 1 Failed | 0 Pending | 0 Skipped
How do I properly test for panics in Ginkgo/Gomega?
答案1
得分: 6
从文档中可以看到：
> 如果 ACTUAL 是一个函数，在调用时会引发 panic，则成功。ACTUAL 必须是一个不带参数且不返回结果的函数 -- ACTUAL 的任何其他类型都是错误的。
请注意，ACTUAL（传递给 Expect 的参数）应该是一个函数。在这种情况下，Gomega 会调用该函数并捕获 panic，以便可以对其进行断言。
要修复你的特定示例：
var _ = ginkgo.Describe("Format Tests", func() {ginkgo.Describe("When formatting the date", func() {ginkgo.It("如果时间无法格式化，应该引发 panic", func() {gomega.Expect(func(){tools.ParseUnixTimeString("2314321432143124223432434")}).To(gomega.Panic())})})
英文:
From the documentation:
> succeeds if ACTUAL is a function that, when invoked, panics. ACTUAL must be a function that takes no arguments and returns no result -- any other type for ACTUAL is an error.
Notice that ACTUAL (the argument passed into Expect) is supposed to be a function.
What Gomega will do in this case, is invoke that function and catch the panic so it can assert on it.
To fix your particular example:
var _ = ginkgo.Describe("Format Tests", func() {ginkgo.Describe("When formatting the date", func() {ginkgo.It("should panic if the time can't be formatted", func() {gomega.Expect(func(){tools.ParseUnixTimeString("2314321432143124223432434")}).To(gomega.Panic())})})
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