Test_createPackageMap test failing with go1.15

[GrigoriyMikhalkin]

Actual behavior
Test Test_createPackageMap fails when run with go1.15. Output:

    --- FAIL: Test_createPackageMap/golang_package (0.00s)
        mockgen_test.go:359: createPackageMap() gotPackageName = , wantPackageName = context
        mockgen_test.go:362: createPackageMap() gotOk = false, wantOK = true
    --- FAIL: Test_createPackageMap/third_party (0.00s)
        mockgen_test.go:359: createPackageMap() gotPackageName = , wantPackageName = present
        mockgen_test.go:362: createPackageMap() gotOk = false, wantOK = true

Expected behavior
When i run tests with go1.14 all tests are passing.

[kishaningithub]

Linking here the PR

[codyoss]

This seems to be due to change in go list in 1.15. In older versions of go the command go list -json context a/bad/path worked and would return info about context. The same command in 1.15 gives an error:

package a/bad/path is not in GOROOT (/usr/local/go/src/a/bad/path)

Or in the case of something more real looking module: go list -json context github.com/a/bad/path

Output:

go: finding module for package github.com/a/bad/path
...

In practice this should not be an issue though as the imports being scanned from source code should be resolvable. I will get a fix out for this.

[codyoss]

Fixed in #512.