$GOPATH/src/... and vendor/... versions are different

Question

My project, using Go 1.8, has a dependency on github.com/stretchr/testify. I retrieved the latest using go get -u github.com/stretchr/testify and the version in $GOPATH/src appears to be correct.

I added the latest version number as a contraint in Gopkg.toml:

[[constraint]]
  name = "github.com/stretchr/testify"
  version = "1.1.4"

I then ran dep ensure -update and then dep status to update the vendor directory (output of dep status):

github.com/stretchr/testify  ^1.1.4  v1.1.4  69483b4  69483b4  1   

The version in $GOPATH/src contains, in the file github.com/stretchr/testify/assert/assertions.go, the function PanicsWithValue:

func Panics(t TestingT, f PanicTestFunc, msgAndArgs ...interface{}) bool {
    // ...
}

func PanicsWithValue(t TestingT, expected interface{}, f PanicTestFunc, msgAndArgs ...interface{}) bool {
    // ...
}

func NotPanics(t TestingT, f PanicTestFunc, msgAndArgs ...interface{}) bool {
    // ...
}

but in the version in vendor, that function is missing:

func Panics(t TestingT, f PanicTestFunc, msgAndArgs ...interface{}) bool {
    // ...
}

func NotPanics(t TestingT, f PanicTestFunc, msgAndArgs ...interface{}) bool {
    // ...
}

What am I doing wrong? I would like to use the function PanicsWithValue in my testing. I even tried deleting the entire vendor directory and rebuilding it.

Answer 1

By pinning the version to v1.1.4, you're specifically telling dep to use a version that does not include the feature you want (check the history of the testify package on GitHub - v1.1.4 is from last September, PanicsWithValue was added this past June). If you unpin the version (version = "*") it should use master@HEAD which includes PanicsWithValue.