A Go test in Go

A file ending _test.go, a function taking *testing.T, and t.Errorf.

func Slugify(title string) string {
    return strings.ReplaceAll(strings.ToLower(title), " ", "-")
}

func TestSlugify(t *testing.T) {
    got := Slugify("Language Basics")
    want := "language-basics"
    if got != want {
        t.Errorf("Slugify() = %q, want %q", got, want)
    }
}

func TestSlugifyEmpty(t *testing.T) {
    if got := Slugify(""); got != "" {
        t.Fatalf("expected empty, got %q", got)
    }
}

How it works

1. The name must start with Test and take *testing.T.
2. t.Errorf records a failure and continues; t.Fatalf stops.
3. No assertion library: you write the comparison.

Keywords and builtins used here

• func
• if
• return
• string

The run, in numbers

Lines

17

Characters to type

377

Tokens

93

Three-star pace

100 tpm

At the three-star pace of 100 tokens a minute, this run takes about 56 seconds.

Type this snippet

Step 1 of 4 in Writing tests, step 1 of 13 in Testing.

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