api: Assert in Auth that realmUrl doesn't have query or fragment

Author: chrisbobbe

lib/api/core.dart

@@ -4,7 +4,8 @@ import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
 
 class Auth {
-  const Auth({required this.realmUrl, required this.email, required this.apiKey});
+  Auth({required this.realmUrl, required this.email, required this.apiKey})
+   : assert(Uri.parse(realmUrl).query.isEmpty && Uri.parse(realmUrl).fragment.isEmpty);
 
   final String realmUrl;
   final String email;

lib/model/store.dart

@@ -204,7 +204,7 @@ class PerAccountStore extends ChangeNotifier {
 
 @immutable
 class Account extends Auth {
-  const Account({
+  Account({
     required super.realmUrl,
     required super.email,
     required super.apiKey,
@@ -243,7 +243,7 @@ class LiveGlobalStore extends GlobalStore {
 ///
 /// See "Server credentials" in the project README for how to fill in the
 /// `credential_fixture.dart` file this requires.
-const Account _fixtureAccount = Account(
+final Account _fixtureAccount = Account(
   realmUrl: credentials.realmUrl,
   email: credentials.email,
   apiKey: credentials.apiKey,

test/example_data.dart

@@ -7,7 +7,7 @@ const String realmUrl = 'https://chat.example/';
 const String recentZulipVersion = '6.1';
 const int recentZulipFeatureLevel = 164;
 
-const Account selfAccount = Account(
+final Account selfAccount = Account(
   realmUrl: realmUrl,
   email: 'self@example',
   apiKey: 'asdfqwer',
@@ -17,7 +17,7 @@ const Account selfAccount = Account(
   zulipMergeBase: recentZulipVersion,
 );
 
-const Account otherAccount = Account(
+final Account otherAccount = Account(
   realmUrl: realmUrl,
   email: 'other@example',
   apiKey: 'sdfgwert',