package s3 import ( "fmt" "testing" "time" "github.com/bmizerany/assert" ) func Test_Key(t *testing.T) { d := time.Now().UTC().Format("2006/01/02") k := Key("", "a", "b") assert.Equal(t, k, fmt.Sprintf("%v/a-b", d)) k = Key("prefix", "a", "b") assert.Equal(t, k, fmt.Sprintf("prefix/%v/a-b", d)) }