Usernames must start with a letter (#5581)

model/user_test.go

@@ -95,7 +95,7 @@ func TestUserIsValid(t *testing.T) {
 		t.Fatal()
 	}
 
-	user.Username = NewId()
+	user.Username = "n" + NewId()
 	user.Email = strings.Repeat("01234567890", 20)
 	if err := user.IsValid(); err == nil {
 		t.Fatal()
@@ -189,6 +189,10 @@ var usernames = []struct {
 	expected bool
 }{
 	{"spin-punch", true},
+	{"sp", false},
+	{"1spin-punch", false},
+	{"-spin-punch", false},
+	{".spin-punch", false},
 	{"Spin-punch", false},
 	{"spin punch-", false},
 	{"spin_punch", true},