README
¶
Make monkey patch easier
Instead of:
monkey.PatchInstanceMethod(SomeType, "SomeFunc", func(a int, b string, c somePackage.SomeStruct, d []string, e interface{}) error {
return nil
})
You can use:
monkeyExtensions.PatchInstanceMethodFlexible(SomeType, "SomeFunc", func() error {
return nil
})
Make monkey patch possible
Extension to PatchInstanceMethod functionality of https://github.com/bouk/monkey
Allows to patch an instance method with providing part (or not providing at all) input parameters.
- must when we don't have access to the private receiver type
- might be useful when we interested only in return value
Added PatchInstanceMethodFlexible, similar to PatchInstanceMethod, but doesn't require input parameters be the same type as patched method input parameters.
Example:
type MyStruct struct {...}
func (s *MyStruct) SomeFunc(a int, b string) error {...}
...
my := MyStruct{}
monkey.PatchInstanceMethodFlexible(reflect.TypeOf(my), "SomeFunc", func( /*NO INPUT PARAMETERS*/) error {
...
})
// or if we are interested in some input parameter
monkey.PatchInstanceMethodFlexible(reflect.TypeOf(my), "SomeFunc", func(_, _ interface{}, b string) error {
// can use "a"
})
In both examples above, the first input param in the replacement func is the "receiver".
If "receiver" is private - widely used when exposing by interface and initiated internally with "private" implementation - regular monkey patch can't be done :/
PatchInstanceMethodFlexible allows us to define replacement func without specify real inputs type (that sometimes is not accessible), so we can patch also functions with "private" receiver
Known issues:
- UnpatchInstanceMethod instance method caused by bug in base project.
- You can use UnpatchAll method instead of UnpatchInstanceMethod
- Upd: 23.05.2018, unmerged fix).
Tests:
> go get -v github.com/onsi/ginkgo/ginkgo
> go get -v github.com/onsi/gomega
> ginkgo
Documentation
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