Integration tests in golang

In an ideal world, I want to run `go test` to run unit tests (which should be fast, not rely on external resources/network/etc) and add something to the command to specify that I want to run integration tests. You can definitely do it with ENV variables and/or some flags inside the test package, but what I've settled on for now is to use build tags and separate out my integration tests.

Create a file 'integration_test.go' and add the following build tag to the file before the package (note: you must put a blank line after the build tag to distinguish it from a comment):

// +build integration

Then just write your tests as usual.

When it comes time to run them, you still use `go test` for your unit tests but now you can type `go test -tags=integration` to only run your integration tests.