Package st, pronounced ghost, is a tiny test framework for making short, useful assertions in your Go tests. Assert(t, have, want) and Refute(t, have, want) abort a test immediately with t.Fatal. Expect(t, have, want) and Reject(t, have, want) allow a test to continue, reporting failure at the end with t.Error. They print nice error messages, preserving the order of have (actual result) before want (expected result) to minimize confusion.