Fix pullRequestApprovalRequirementsMessage for non-flutter-hackers approval groups

auto_submit/lib/service/config.dart

@@ -173,9 +173,9 @@ class Config {
   );
 
   /// Pull request approval message
-  static const String pullRequestApprovalRequirementsMessage =
+  static String pullRequestApprovalRequirementsMessage(String approvalGroup) =>
       '- Merge guidelines: A PR needs at least one approved review if the author is already '
-      'part of flutter-hackers or two member reviews if the author is not a flutter-hacker '
+      'part of $approvalGroup or two member reviews if the author is not a member of $approvalGroup '
       'before re-applying the autosubmit label. __Reviewers__: If you left a comment '
       'approving, please use the "approve" review action instead.';
 

auto_submit/lib/validations/approval.dart

@@ -89,7 +89,7 @@ class Approval extends Validation {
 
       message = approved
           ? approvedMessage
-          : '$approvedMessage\n${Config.pullRequestApprovalRequirementsMessage}';
+          : '$approvedMessage\n${Config.pullRequestApprovalRequirementsMessage(repositoryConfiguration.approvalGroup)}';
     }
 
     return ValidationResult(approved, action, message);

auto_submit/test/validations/approval_test.dart

@@ -389,5 +389,41 @@ void main() {
         isTrue,
       );
     });
+    test(
+      'pullRequestApprovalRequirementsMessage takes approval_group from config',
+      () async {
+        config.repositoryConfigurationMock = RepositoryConfiguration.fromYaml(
+          '''
+        default_branch: main
+        allow_config_override: false
+        auto_approval_accounts:
+          - dependabot[bot]
+          - dependabot
+          - DartDevtoolWorkflowBot
+        approving_reviews: 2
+        approval_group: custom-group
+        run_ci: true
+        support_no_review_revert: true
+        required_checkruns_on_revert:
+          - ci.yaml validation
+      ''',
+        );
+        approval = Approval(config: config);
+
+        githubService.isTeamMemberMockMap['author1'] = false;
+        githubService.isTeamMemberMockMap['keyonghan'] = false;
+        final review = constructSingleReviewerReview(reviewState: 'APPROVED');
+
+        final result = await computeValidationResult(review);
+
+        expect(result.result, isFalse);
+        expect(
+          result.message.contains(
+            'part of custom-group or two member reviews if the author is not a member of custom-group',
+          ),
+          isTrue,
+        );
+      },
+    );
   });
 }