Add tests for register and login endpoints

internal/handlers/auth.go

@@ -28,7 +28,7 @@ func (hdlr *Handlers) handleRegister(
 ) {
 	type registerRequest struct {
 		Nick     string `json:"nick"`
-		Password string `json:"password"`
+		Password string `json:"password"` //nolint:gosec // not a hardcoded secret
 	}
 
 	var payload registerRequest
@@ -134,7 +134,7 @@ func (hdlr *Handlers) handleLogin(
 ) {
 	type loginRequest struct {
 		Nick     string `json:"nick"`
-		Password string `json:"password"`
+		Password string `json:"password"` //nolint:gosec // not a hardcoded secret
 	}
 
 	var payload loginRequest