autocomplete test [nfc]: Use test group to handle testUser cases

'testUser' is a filter function that is expected to get complicated
as we add features. For example it will be responsible for filtering
users based on email, name, stream activity, etc. More on this: #236
so it is useful to have the test cases for 'testUser' grouped.

Author: Khader-1

test/model/autocomplete_test.dart

@@ -305,40 +305,42 @@ void main() {
     }
   });
 
-  test('MentionAutocompleteQuery.testUser', () {
+  group('MentionAutocompleteQuery.testUser', () {
     doCheck(String rawQuery, User user, bool expected) {
       final result = MentionAutocompleteQuery(rawQuery)
         .testUser(user, AutocompleteDataCache());
       expected ? check(result).isTrue() : check(result).isFalse();
     }
 
-    doCheck('', eg.user(fullName: 'Full Name'), true);
-    doCheck('', eg.user(fullName: ''), true); // Unlikely case, but should not crash
-    doCheck('Full Name', eg.user(fullName: 'Full Name'), true);
-    doCheck('full name', eg.user(fullName: 'Full Name'), true);
-    doCheck('Full Name', eg.user(fullName: 'full name'), true);
-    doCheck('Full', eg.user(fullName: 'Full Name'), true);
-    doCheck('Name', eg.user(fullName: 'Full Name'), true);
-    doCheck('Full Name', eg.user(fullName: 'Fully Named'), true);
-    doCheck('Full Four', eg.user(fullName: 'Full Name Four Words'), true);
-    doCheck('Name Words', eg.user(fullName: 'Full Name Four Words'), true);
-    doCheck('Full F', eg.user(fullName: 'Full Name Four Words'), true);
-    doCheck('F Four', eg.user(fullName: 'Full Name Four Words'), true);
-    doCheck('full full', eg.user(fullName: 'Full Full Name'), true);
-    doCheck('full full', eg.user(fullName: 'Full Name Full'), true);
-
-    doCheck('F', eg.user(fullName: ''), false); // Unlikely case, but should not crash
-    doCheck('Fully Named', eg.user(fullName: 'Full Name'), false);
-    doCheck('Full Name', eg.user(fullName: 'Full'), false);
-    doCheck('Full Name', eg.user(fullName: 'Name'), false);
-    doCheck('ull ame', eg.user(fullName: 'Full Name'), false);
-    doCheck('ull Name', eg.user(fullName: 'Full Name'), false);
-    doCheck('Full ame', eg.user(fullName: 'Full Name'), false);
-    doCheck('Full Full', eg.user(fullName: 'Full Name'), false);
-    doCheck('Name Name', eg.user(fullName: 'Full Name'), false);
-    doCheck('Name Full', eg.user(fullName: 'Full Name'), false);
-    doCheck('Name Four Full Words', eg.user(fullName: 'Full Name Four Words'), false);
-    doCheck('F Full', eg.user(fullName: 'Full Name Four Words'), false);
-    doCheck('Four F', eg.user(fullName: 'Full Name Four Words'), false);
+    test('user is included if fullname words match the query', () {
+      doCheck('', eg.user(fullName: 'Full Name'), true);
+      doCheck('', eg.user(fullName: ''), true); // Unlikely case, but should not crash
+      doCheck('Full Name', eg.user(fullName: 'Full Name'), true);
+      doCheck('full name', eg.user(fullName: 'Full Name'), true);
+      doCheck('Full Name', eg.user(fullName: 'full name'), true);
+      doCheck('Full', eg.user(fullName: 'Full Name'), true);
+      doCheck('Name', eg.user(fullName: 'Full Name'), true);
+      doCheck('Full Name', eg.user(fullName: 'Fully Named'), true);
+      doCheck('Full Four', eg.user(fullName: 'Full Name Four Words'), true);
+      doCheck('Name Words', eg.user(fullName: 'Full Name Four Words'), true);
+      doCheck('Full F', eg.user(fullName: 'Full Name Four Words'), true);
+      doCheck('F Four', eg.user(fullName: 'Full Name Four Words'), true);
+      doCheck('full full', eg.user(fullName: 'Full Full Name'), true);
+      doCheck('full full', eg.user(fullName: 'Full Name Full'), true);
+
+      doCheck('F', eg.user(fullName: ''), false); // Unlikely case, but should not crash
+      doCheck('Fully Named', eg.user(fullName: 'Full Name'), false);
+      doCheck('Full Name', eg.user(fullName: 'Full'), false);
+      doCheck('Full Name', eg.user(fullName: 'Name'), false);
+      doCheck('ull ame', eg.user(fullName: 'Full Name'), false);
+      doCheck('ull Name', eg.user(fullName: 'Full Name'), false);
+      doCheck('Full ame', eg.user(fullName: 'Full Name'), false);
+      doCheck('Full Full', eg.user(fullName: 'Full Name'), false);
+      doCheck('Name Name', eg.user(fullName: 'Full Name'), false);
+      doCheck('Name Full', eg.user(fullName: 'Full Name'), false);
+      doCheck('Name Four Full Words', eg.user(fullName: 'Full Name Four Words'), false);
+      doCheck('F Full', eg.user(fullName: 'Full Name Four Words'), false);
+      doCheck('Four F', eg.user(fullName: 'Full Name Four Words'), false);
+    });
   });
 }