英文:
Table driven tests for private types with public constructors
问题
我正在尝试减少我的API的表面积，所以我将我的app结构体设为非导出（小写名称），只暴露了New函数：
package mylib
type app struct {
}
func New() *app {
return &app{}
}
但是现在，我想为这个东西编写一个表驱动测试，但是我不能在结构体中持有mylib.app：
package mylib_test
import (
"testing"
"mylib"
)
func TestApp(t *testing.T) {
tests := []struct {
name string
app private_type_public_new.app // 这部分不起作用
}{
// ...
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
})
}
}
我有哪些选择？我应该将app结构体设为公开（App），并将所有字段设为非导出吗？我是否可以使用高阶函数来存储New函数的实例，以在子测试中实例化应用程序？还有其他方法吗？
英文:
I'm trying to reduce the surface area of my API, so I made my app struct non-exported (with the lowercase name), and only exposed the New function:
package mylib
type app struct {
}
func New() *app {
return &app{}
}
But now, I want to write a table-driven test for this thing, and I can't hold a mylib.app in a struct:
package mylib_test
import (
"testing"
"mylib"
)
func TestApp(t *testing.T) {
tests := []struct {
name string
app private_type_public_new.app // This part doesn't work
}{
// ...
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
})
}
}
What options do I have? Should I make the app struct public (App) and leave all the fields unexported? Is there something interesting I can do with higher order functions to store instances of the New function to instantiate apps within the subtests? Something else?
答案1
得分: 0
是的，将其导出为App。golang/lint（现已弃用）特别警告导出的函数引用未导出的类型，因为这对于使用您的包的消费者来说很困难。例如，如果您分配了x := mylib.New()，使得x是*myapp.app的实例，go-pls将只显示该变量的类型，意味着您附加的任何描述性注释都不会显示。
请参阅https://github.com/golang/lint/issues/210
英文:
> What options do I have? Should I make the app struct public (App) and leave all the fields unexported?
Yes, export it as App. golang/lint (now deprecated) specifically warned about exported functions that referenced unexported types, as they are difficult for consumers of your package to work with. For example, if you assign x := mylib.New() such that x is an instance of *myapp.app, go-pls will show nothing about this variable except its type, meaning any descriptive comment you've attached to it will not appear.
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