//go:build ignore

// EXAMPLE — table-driven unit test shape.
package examples

import "testing"

func TestClampBirthMonth(t *testing.T) {
	tests := []struct {
		name    string
		month   int
		wantErr bool
	}{
		{name: "ok", month: 6, wantErr: false},
		{name: "zero", month: 0, wantErr: true},
		{name: "thirteen", month: 13, wantErr: true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := validateMonth(tt.month)
			if (err != nil) != tt.wantErr {
				t.Fatalf("validateMonth(%d) err=%v wantErr=%v", tt.month, err, tt.wantErr)
			}
		})
	}
}

func validateMonth(m int) error {
	if m < 1 || m > 12 {
		return errInvalid
	}
	return nil
}

var errInvalid = errString("invalid")

type errString string

func (e errString) Error() string { return string(e) }