PLT-5943 Reduce minimum username length (#5798)

api4/user_test.go

@@ -160,9 +160,6 @@ func TestGetUserByUsername(t *testing.T) {
 	_, resp = Client.GetUserByUsername(GenerateTestUsername(), "")
 	CheckNotFoundStatus(t, resp)
 
-	_, resp = Client.GetUserByUsername(model.NewRandomString(1), "")
-	CheckBadRequestStatus(t, resp)
-
 	// Check against privacy config settings
 	emailPrivacy := utils.Cfg.PrivacySettings.ShowEmailAddress
 	namePrivacy := utils.Cfg.PrivacySettings.ShowFullName

model/user.go

@@ -36,7 +36,7 @@ const (
 	USER_LAST_NAME_MAX_RUNES  = 64
 	USER_AUTH_DATA_MAX_LENGTH = 128
 	USER_NAME_MAX_LENGTH      = 64
-	USER_NAME_MIN_LENGTH      = 3
+	USER_NAME_MIN_LENGTH      = 1
 )
 
 type User struct {

model/user_test.go

@@ -189,7 +189,8 @@ var usernames = []struct {
 	expected bool
 }{
 	{"spin-punch", true},
-	{"sp", false},
+	{"sp", true},
+	{"s", true},
 	{"1spin-punch", false},
 	{"-spin-punch", false},
 	{".spin-punch", false},