add unit tests

pkg/validators/username_test.go

@@ -0,0 +1,32 @@
+package validators
+
+import (
+	"testing"
+
+	"github.com/go-playground/validator/v10"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidUsername(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validUsername", ValidUsername)
+	assert.Nil(t, err)
+
+	username := "foobar"
+	err = validate.Var(username, "validUsername")
+	assert.Nil(t, err)
+
+	username = "--foo_bar--"
+	err = validate.Var(username, "validUsername")
+	assert.Nil(t, err)
+}
+
+func TestInvalidUsername(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validUsername", ValidUsername)
+	assert.Nil(t, err)
+
+	username := "foo~bar~"
+	err = validate.Var(username, "validUsername")
+	assert.NotNil(t, err)
+}