Obsolete module path for testify?

[dmoles]

Steps to reproduce:

1. In an existing Go 1.11+ module project, create a new file containing

   import (
   "github.com/martinlindhe/unit"
   )
    
   func init() {
      ft := 1 * unit.Foot
      println(ft)
   }
   

2. At the console, type go mod tidy

Expected:

• requirements pulled, go.mod is updated

Actual:

go: finding github.com/martinlindhe/unit latest
go: finding github.com/stretchrcom/testify/assert latest
go: github.com/stretchrcom/testify@v1.3.0: parsing go.mod: unexpected module path "github.com/stretchr/testify"
go: error loading module requirements

Workaround:

• take a local clone of this repository
• modify unit_test.go to use stretchr rather than stretchrcom
• in the module project, add a replace directive to substitute the local clone for github.com/martinlindhe/unit
• in the local clone, use go mod init to add a go.mod file (replace only works with module projects)