If you run Golang tests on Travis CI, it will download all of your dependencies with three dots:
go get -d -v ./... && go build -v ./...
go [command] ./...
Here ./ tells to start from the current folder, ... tells to go down recursively.
./
...
For Example:
go list ...
In any folder lists all the packages, including packages of the standard library first followed by external libraries in your go workspace.