goods/api/internal/gtin/gtin_test.go

package gtin

import "testing"

func TestNormalizeValid(t *testing.T) {
	cases := []struct{ in, want, typ string }{
		{" 5449000000996 ", "5449000000996", "EAN13"}, // Coca-Cola EAN-13
		{"3017624010701", "3017624010701", "EAN13"},   // Nutella EAN-13
		{"036000291452", "036000291452", "UPC"},       // UPC-A
		{"96385074", "96385074", "EAN8"},              // EAN-8
		{"00012345600012", "00012345600012", "GTIN14"},
		{"6901234567892", "6901234567892", "EAN13"}, // China 690 prefix
	}
	for _, c := range cases {
		got, err := Normalize(c.in)
		if err != nil {
			t.Errorf("Normalize(%q) unexpected error: %v", c.in, err)
			continue
		}
		if got != c.want {
			t.Errorf("Normalize(%q) = %q, want %q", c.in, got, c.want)
		}
		if InferType(got) != c.typ {
			t.Errorf("InferType(%q) = %q, want %q", got, InferType(got), c.typ)
		}
	}
}

func TestNormalizeRejects(t *testing.T) {
	cases := []struct {
		in   string
		want error
	}{
		{"", ErrEmpty},
		{"12ab5678", ErrFormat},
		{"12345", ErrFormat},
		{"5449000000997", ErrCheck},      // bad check digit
		{"2012345678903", ErrRestricted}, // 20-29 in-store EAN-13
		{"0212345678909", ErrRestricted}, // 02x variable measure
		{"212345678909", ErrRestricted},  // UPC number system 2
		{"02345673", ErrRestricted},      // EAN-8 in-store
	}
	for _, c := range cases {
		_, err := Normalize(c.in)
		if err != c.want {
			t.Errorf("Normalize(%q) error = %v, want %v", c.in, err, c.want)
		}
	}
}