✨ Add UUID generator

generators_test.go

@@ -0,0 +1,33 @@
+package nomino
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestWithUUID(t *testing.T) {
+	var c config
+	WithUUID()(&c)
+	st, err := c.generator()
+	assert.NoError(t, err)
+	_, parseErr := uuid.Parse(st)
+	assert.NoError(t, parseErr)
+}
+
+type badRead struct{}
+
+func (badRead) Read([]byte) (int, error) {
+	return 0, errors.New("sorry")
+}
+
+func TestWithUUIDFail(t *testing.T) {
+	var c config
+	uuid.SetRand(badRead{})
+	defer uuid.SetRand(nil)
+	WithUUID()(&c)
+	_, err := c.generator()
+	assert.Equal(t, errors.New("sorry"), err)
+}