英文:
Go testing customization with testing.TB
问题
我正在尝试使用自己的assert方法来自定义testing.T，以减少我编写的代码行数。我尝试了以下方法，但出现了错误："wrong signature for TestCustom, must be: func TestCustom(t *testing.T)"。
我该如何使TestCustom使用CustomTester接口，并添加一个新的方法assert？
我不想使用第三方框架。
custom_testing.go
type CustomTester struct {
testing.TB
}
func (t *CustomTester) assert(exp interface{}, act interface{}) {
if exp != act {
t.Errorf("expected: %v. got: %v\n", exp, act)
}
}
// 我想要在这里使用testing包注入testing.T
// 但是，通过使用我的自定义包装器：CustomTester结构体，
// 使用我的自定义assert方法来摆脱在每个assert中使用t作为参数，
// 例如：assert(t, exp, act)
func TestCustom(t *testing.TB) {
t.assert(3, len(foo))
}
注意： 我也尝试过这个方法，它可以工作，但是我不想在每次测试时都传递t参数：
working_not_wanted.go
func assert(t *testing.TB, exp interface{}, act interface{}) {
if exp != act {
t.Errorf("expected: %v. got: %v\n", exp, act)
}
}
func TestCustom(t *testing.T) {
assert(t, 3, len(foo))
}
英文:
I'm trying to customize the testing.T with my own assert method to lower the number of lines I'm writing. I tried the following, ended with an error: "wrong signature for TestCustom, must be: func TestCustom(t *testing.T)".
How can I make TestCustom use CustomTester interface with a new method, assert?
I don't want to use a 3rd-party framework.
custom_testing.go
type CustomTester struct {
testing.TB
}
func (t *CustomTester) assert(exp interface{}, act interface{}) {
if exp != act {
t.Errorf("expected: %v. got: %v\n", exp, act)
}
}
// I want testing package inject testing.T here
// But, by using my own wrapper: CustomTester struct with,
// my own assert method to get rid of using t as an argument,
// in each assert like: assert(t, exp, act)
func TestCustom(t *testing.TB) {
t.assert(3, len(foo))
}
NOTE: I also tried this, it works but, I don't want to pass t each time when I'm testing:
working_not_wanted.go
func assert(t *testing.TB, exp interface{}, act interface{}) {
if exp != act {
t.Errorf("expected: %v. got: %v\n", exp, act)
}
}
func TestCustom(t *testing.T) {
assert(t, 3, len(foo))
}
答案1
得分: 3
Go测试框架执行具有特定签名的测试函数，该签名接受一个*testing.T。如果您想使用stdlib测试系统，您的测试函数必须具有所需的签名。
您可以在每个测试函数中用一行代码包装它：
func MyTest(stdt *testing.T) {
// 这一行：
t := &CustomTester{stdt}
t.assert(true)
t.Error("An error done happened")
}
还有其他方法可以实现，但是无法通过go test运行使用stdlib testing包的测试函数，除了将*testing.T作为其唯一参数之外。
英文:
The Go testing framework executes test functions of a specific signature, and that signature takes a *testing.T. If you want to use the stdlib testing system, your test functions have to have the required signature.
You could wrap it with one line in every test function:
func MyTest(stdt *testing.T) {
// This line:
t := &CustomTester{stdt}
t.assert(true)
t.Error("An error done happened")
}
There are other ways to do it, but there is no way to have a testing function, run by go test, using the stdlib testing package, that takes anything other than *testing.T as its sole parameter.
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