What do three dots “./…” mean in Go command line invocations?

Question

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 ./...

Answer 1

From the command go help packages:

An import path is a pattern if it includes one or more "..." wildcards, each of which can match any string, including the empty string and strings containing slashes. Such a pattern expands to all package directories found in the GOPATH trees with names matching the patterns. As a special case, x/... matches x as well as x's subdirectories. For example, net/... expands to net and packages in its subdirectories.