diff --git a/CHANGELOG.md b/CHANGELOG.md
index 854d7e13c8..289a86cb83 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## 4.21.0
 
+* fix: add rule 'missing-test-assertion' in rules factory.
 * feat: add static code diagnostic [`missing-test-assertion`](https://dartcodemetrics.dev/docs/rules/common/missing-test-assertion).
 
 ## 4.20.0
diff --git a/lib/src/analyzers/lint_analyzer/rules/rules_factory.dart b/lib/src/analyzers/lint_analyzer/rules/rules_factory.dart
index 008c3d74f2..149f95b059 100644
--- a/lib/src/analyzers/lint_analyzer/rules/rules_factory.dart
+++ b/lib/src/analyzers/lint_analyzer/rules/rules_factory.dart
@@ -35,6 +35,7 @@ import 'rules_list/double_literal_format/double_literal_format_rule.dart';
 import 'rules_list/format_comment/format_comment_rule.dart';
 import 'rules_list/member_ordering/member_ordering_rule.dart';
 import 'rules_list/member_ordering_extended/member_ordering_extended_rule.dart';
+import 'rules_list/missing_test_assertion/missing_test_assertion_rule.dart';
 import 'rules_list/newline_before_return/newline_before_return_rule.dart';
 import 'rules_list/no_boolean_literal_compare/no_boolean_literal_compare_rule.dart';
 import 'rules_list/no_empty_block/no_empty_block_rule.dart';
@@ -109,6 +110,7 @@ final _implementedRules = <String, Rule Function(Map<String, Object>)>{
   FormatCommentRule.ruleId: FormatCommentRule.new,
   MemberOrderingRule.ruleId: MemberOrderingRule.new,
   MemberOrderingExtendedRule.ruleId: MemberOrderingExtendedRule.new,
+  MissingTestAssertionRule.ruleId: MissingTestAssertionRule.new,
   NewlineBeforeReturnRule.ruleId: NewlineBeforeReturnRule.new,
   NoBooleanLiteralCompareRule.ruleId: NoBooleanLiteralCompareRule.new,
   NoEmptyBlockRule.ruleId: NoEmptyBlockRule.new,
diff --git a/test/src/analyzers/lint_analyzer/rules/rules_factory_test.dart b/test/src/analyzers/lint_analyzer/rules/rules_factory_test.dart
index 9fe88246d5..3febbd4a5f 100644
--- a/test/src/analyzers/lint_analyzer/rules/rules_factory_test.dart
+++ b/test/src/analyzers/lint_analyzer/rules/rules_factory_test.dart
@@ -27,6 +27,7 @@ void main() {
         'prefer-trailing-comma': <String, Object>{},
         'avoid-late-keyword': <String, Object>{},
         'member-ordering-extended': <String, Object>{},
+        'missing-test-assertion': <String, Object>{},
         'avoid-non-null-assertion': <String, Object>{},
         'avoid-unused-parameters': <String, Object>{},
         'avoid-returning-widgets': <String, Object>{},
@@ -71,6 +72,7 @@ void main() {
         'format-comment',
         'member-ordering',
         'member-ordering-extended',
+        'missing-test-assertion',
         'newline-before-return',
         'no-boolean-literal-compare',
         'no-empty-block',