mockgen does not create mocks

Question content

This is my folder structure:

demo/
|-- go.mod
|-- main.go
|-- interfaces/
|   |-- interfaces.go
|-- mocks/

This is my go.mod file

go 1.20

require (
    github.com/golang/mock v1.6.0 // indirect
    golang.org/x/mod v0.4.2 // indirect
    golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
    golang.org/x/tools v0.1.1 // indirect
    golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
)

This is my interfaces.go

package interfaces

type MyInterface interface {
    DoSomething() error
    GetValue() int
}

When I try to run the mockgen command, instead of creating the mock, it gives me this help description: mockgen has two operating modes: source and reflect. Source mode generates mock interfaces from source files. It is enabled by using the -source flag. Other flags that may be useful in this mode are -imports and -aux_files.

https://manpages.org/mockgen

I ran the following command: mockgen -destination=mocks/mock_myinterface.go -package=mocks demo/interfaces MyInterface

How to use mockgen command correctly?

Correct answer

You should probably use the fork maintained by Uber (because Google abandoned golang/mock): https: //github.com/uber -go/mock

If you just run the mockgen command you will get the command options. Something that should work for you is this:

mockgen -source interfaces/interfaces.go -destination mocks/mocks.go

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