Add spec

spec/lib/gitlab/regex_spec.rb

@@ -14,7 +14,7 @@ describe Gitlab::Regex do
     it { is_expected.not_to match('?gitlab') }
   end
-  describe '.environment_slug_regex' do
+  describe '.environment_name_regex' do
     subject { described_class.environment_name_regex }
     it { is_expected.to match('foo') }
@@ -24,6 +24,7 @@ describe Gitlab::Regex do
     it { is_expected.to match('foo.1') }
     it { is_expected.not_to match('9&foo') }
     it { is_expected.not_to match('foo-^') }
+    it { is_expected.not_to match('!!()()') }
   end
   describe '.environment_slug_regex' do