test/example/greetings_test.go

// https://golang.org/doc/tutorial/add-a-test

package greetings

import (
    "testing"
    "regexp"
)

// TestHelloName calls greetings.Hello with a name, checking
// for a valid return value.
func TestHelloName(t *testing.T) {
    name := "Gladys"
    want := regexp.MustCompile(`\b`+name+`\b`)
    msg := Hello("Gladys")
    if !want.MatchString(msg) {
        t.Fatalf(`Hello("Gladys") = %q, %v`, msg, want)
    }
}