Check error messages to avoid false positives

This verifies the error message returned when a push is rejected
because of push rules. This ensures that the tests pass because
the expected error occurred and not because of some unrelated
error.

Also adds brackets for consistency with other code.

qa/qa/specs/features/ee/browser_ui/3_create/repository/push_rules_spec.rb

@@ -4,7 +4,7 @@ module QA
   context 'Create' do
     context 'Push Rules' do
       describe 'using non signed commits' do
-        before :context do
+        before(:context) do
           prepare
 
           @file_name_limitation = 'denied_file'
@@ -16,12 +16,12 @@ module QA
 
           Page::Project::Settings::Repository.perform do |repository|
             repository.expand_push_rules do |push_rules|
-              push_rules.fill_file_name @file_name_limitation
-              push_rules.fill_file_size @file_size_limitation
-              push_rules.fill_author_email @authors_email_limitation
-              push_rules.fill_branch_name @branch_name_limitation
-              push_rules.fill_commit_message_rule @needed_phrase_limitation
-              push_rules.fill_deny_commit_message_rule @deny_message_phrase_limitation
+              push_rules.fill_file_name(@file_name_limitation)
+              push_rules.fill_file_size(@file_size_limitation)
+              push_rules.fill_author_email(@authors_email_limitation)
+              push_rules.fill_branch_name(@branch_name_limitation)
+              push_rules.fill_commit_message_rule(@needed_phrase_limitation)
+              push_rules.fill_deny_commit_message_rule(@deny_message_phrase_limitation)
               push_rules.check_prevent_secrets
               push_rules.check_restrict_author
               push_rules.check_deny_delete_tag
@@ -30,6 +30,10 @@ module QA
           end
         end
 
+        it 'allows an unrestricted push' do
+          expect_no_error_on_push(file: standard_file)
+        end
+
         it 'restricts files by name and size' do
           large_file = [{
             name: 'file',
@@ -40,28 +44,31 @@ module QA
             content: SecureRandom.hex(100)
           }]
 
-          expect_no_error_on_push file: standard_file
-          expect_error_on_push file: large_file
-          expect_error_on_push file: wrongly_named_file
+          expect_error_on_push(file: large_file,
+            error: 'File "file" is larger than the allowed size of 1 MB')
+          expect_error_on_push(file: wrongly_named_file,
+            error: Regexp.escape("File name #{@file_name_limitation} was blacklisted by the pattern #{@file_name_limitation}"))
         end
 
         it 'restricts users by email format' do
           gitlab_user = Resource::User.fabricate_or_use(Runtime::Env.gitlab_qa_username_2, Runtime::Env.gitlab_qa_password_2)
-          @project.add_member(gitlab_user)
+          @project.add_member(gitlab_user, Resource::Members::AccessLevel::MAINTAINER)
 
-          expect_no_error_on_push file: standard_file
-          expect_error_on_push file: standard_file, user: gitlab_user
+          expect_error_on_push(file: standard_file, user: gitlab_user,
+            error: Regexp.escape("Committer's email '#{gitlab_user.email}' does not follow the pattern '#{@authors_email_limitation}'"))
         end
 
         it 'restricts branches by branch name' do
-          expect_no_error_on_push file: standard_file
-          expect_error_on_push file: standard_file, branch: 'forbidden_branch'
+          expect_error_on_push(file: standard_file, branch: 'forbidden_branch',
+            error: Regexp.escape("Branch name does not follow the pattern '#{@branch_name_limitation}'"))
         end
 
         it 'restricts commit by message format' do
-          expect_no_error_on_push file: standard_file, commit_message: @needed_phrase_limitation
-          expect_error_on_push file: standard_file, commit_message: 'forbidden message'
-          expect_error_on_push file: standard_file, commit_message: "#{@needed_phrase_limitation} - #{@deny_message_phrase_limitation}"
+          expect_no_error_on_push(file: standard_file, commit_message: @needed_phrase_limitation)
+          expect_error_on_push(file: standard_file, commit_message: 'forbidden message',
+            error: Regexp.escape("Commit message does not follow the pattern '#{@needed_phrase_limitation}'"))
+          expect_error_on_push(file: standard_file, commit_message: "#{@needed_phrase_limitation} - #{@deny_message_phrase_limitation}",
+            error: Regexp.escape("Commit message contains the forbidden pattern '#{@deny_message_phrase_limitation}'"))
         end
 
         it 'restricts committing files with secrets' do
@@ -70,13 +77,13 @@ module QA
             content: SecureRandom.hex(100)
           }]
 
-          expect_no_error_on_push file: standard_file
-          expect_error_on_push file: secret_file
+          expect_error_on_push(file: secret_file,
+            error: Regexp.escape('File name id_rsa was blacklisted by the pattern id_rsa$'))
         end
 
         it 'restricts commits by user' do
-          expect_no_error_on_push file: standard_file
-          expect_error_on_push file: standard_file, user: @root
+          expect_error_on_push(file: standard_file, user: @root,
+            error: Regexp.escape("Author '#{@root.email}' is not a member of team"))
         end
 
         it 'restricts removal of tag' do
@@ -86,37 +93,47 @@ module QA
             tag.name = 'test_tag'
           end
 
-          expect_no_error_on_push file: standard_file
-          expect_error_on_push file: standard_file, tag: tag.name
+          expect_error_on_push(file: standard_file, tag: tag.name,
+            error: 'You cannot delete a tag')
         end
       end
 
-      describe 'using signed commits' do
-        before :context do
+      describe 'with commits restricted to verified emails' do
+        before do
           prepare
 
           Page::Project::Settings::Repository.perform do |repository|
             repository.expand_push_rules do |push_rules|
-              push_rules.check_reject_unsigned_commits
               push_rules.check_committer_restriction
               push_rules.click_submit
             end
           end
+        end
 
-          @gpg = Resource::UserGPG.fabricate_via_api!
+        it 'rejects unverified emails' do
+          expect_no_error_on_push(file: standard_file)
+          expect_error_on_push(file: standard_file, user: @root,
+            error: 'You can only push commits that were committed with one of your own verified emails')
+        end
       end
 
-        it 'restricts to signed commits' do
-          expect_no_error_on_push file: standard_file, gpg: @gpg
-          expect_error_on_push file: standard_file
+      describe 'using signed commits' do
+        before do
+          prepare
+
+          Page::Project::Settings::Repository.perform do |repository|
+            repository.expand_push_rules do |push_rules|
+              push_rules.check_reject_unsigned_commits
+              push_rules.click_submit
+            end
           end
 
-        it 'restricts commits to current authenticated user' do
-          gitlab_user = Resource::User.fabricate_or_use(Runtime::Env.gitlab_qa_username_1, Runtime::Env.gitlab_qa_password_1)
-          @project.add_member(gitlab_user)
+          @gpg = Resource::UserGPG.fabricate_via_api!
+        end
 
-          expect_no_error_on_push file: standard_file, gpg: @gpg
-          expect_error_on_push file: standard_file, gpg: @gpg, user: gitlab_user
+        it 'restricts to signed commits' do
+          expect_no_error_on_push(file: standard_file, gpg: @gpg)
+          expect_error_on_push(file: standard_file, error: 'Commit must be signed with a GPG key')
         end
       end
 
@@ -146,10 +163,10 @@ module QA
         end.not_to raise_error
       end
 
-      def expect_error_on_push(commit_message: 'allowed commit', branch: 'master', file:, user: @creator, tag: nil, gpg: nil)
+      def expect_error_on_push(commit_message: 'allowed commit', branch: 'master', file:, user: @creator, tag: nil, gpg: nil, error: nil)
         expect do
           push commit_message: commit_message, branch: branch, file: file, user: user, tag: tag, gpg: gpg
-        end.to raise_error(QA::Git::Repository::RepositoryCommandError)
+        end.to raise_error(QA::Git::Repository::RepositoryCommandError, /#{error}/)
       end
 
       def prepare