1 files changed, 33 insertions, 0 deletions
diff --git a/spec/lib/gitlab/middleware/handle_malformed_strings_spec.rb b/spec/lib/gitlab/middleware/handle_malformed_strings_spec.rb
index ed1440f23b6..7bc5fd853bf 100644
--- a/spec/lib/gitlab/middleware/handle_malformed_strings_spec.rb
+++ b/spec/lib/gitlab/middleware/handle_malformed_strings_spec.rb
@@ -58,6 +58,39 @@ RSpec.describe Gitlab::Middleware::HandleMalformedStrings do
     end
   end
 
+  context 'with POST request' do
+    let(:request_env) do
+      Rack::MockRequest.env_for(
+        '/',
+        method: 'POST',
+        input: input,
+        'CONTENT_TYPE' => 'application/json'
+      )
+    end
+
+    let(:params) { { method: 'POST' } }
+
+    context 'with valid JSON' do
+      let(:input) { %({"hello": "world"}) }
+
+      it 'returns no error' do
+        env = request_env
+
+        expect(subject.call(env)).not_to eq error_400
+      end
+    end
+
+    context 'with bad JSON' do
+      let(:input) { "{ bad json }" }
+
+      it 'rejects bad JSON with 400 error' do
+        env = request_env
+
+        expect(subject.call(env)).to eq error_400
+      end
+    end
+  end
+
   context 'in authorization headers' do
     let(:problematic_input) { null_byte }