Get Project Branch API shows an helpful error message on invalid refname

In API v4 when requesting a branch with an invalid refname shows an
helpful error message: 'The branch refname is invalid'.

2 files changed, 43 insertions, 0 deletions

diff --git a/spec/requests/api/branches_spec.rb b/spec/requests/api/branches_spec.rb
index 16b12446ed4..e433597f58b 100644
--- a/spec/requests/api/branches_spec.rb
+++ b/spec/requests/api/branches_spec.rb
@@ -110,6 +110,15 @@ describe API::Branches do
         end
       end
 
+      context 'when the branch refname is invalid' do
+        let(:branch_name) { 'branch*' }
+        let(:message) { 'The branch refname is invalid' }
+
+        it_behaves_like '400 response' do
+          let(:request) { get api(route, current_user) }
+        end
+      end
+
       context 'when repository is disabled' do
         include_context 'disabled repository'
 
@@ -234,6 +243,15 @@ describe API::Branches do
         end
       end
 
+      context 'when the branch refname is invalid' do
+        let(:branch_name) { 'branch*' }
+        let(:message) { 'The branch refname is invalid' }
+
+        it_behaves_like '400 response' do
+          let(:request) { put api(route, current_user) }
+        end
+      end
+
       context 'when repository is disabled' do
         include_context 'disabled repository'
 
@@ -359,6 +377,15 @@ describe API::Branches do
         end
       end
 
+      context 'when the branch refname is invalid' do
+        let(:branch_name) { 'branch*' }
+        let(:message) { 'The branch refname is invalid' }
+
+        it_behaves_like '400 response' do
+          let(:request) { put api(route, current_user) }
+        end
+      end
+
       context 'when repository is disabled' do
         include_context 'disabled repository'
 
@@ -520,6 +547,15 @@ describe API::Branches do
       expect(response).to have_gitlab_http_status(404)
     end
 
+    context 'when the branch refname is invalid' do
+      let(:branch_name) { 'branch*' }
+      let(:message) { 'The branch refname is invalid' }
+
+      it_behaves_like '400 response' do
+        let(:request) { delete api("/projects/#{project.id}/repository/branches/#{branch_name}", user) }
+      end
+    end
+
     it_behaves_like '412 response' do
       let(:request) { api("/projects/#{project.id}/repository/branches/#{branch_name}", user) }
     end
diff --git a/spec/support/shared_examples/requests/api/status_shared_examples.rb b/spec/support/shared_examples/requests/api/status_shared_examples.rb
index 7d7f66adeab..0ed917e448a 100644
--- a/spec/support/shared_examples/requests/api/status_shared_examples.rb
+++ b/spec/support/shared_examples/requests/api/status_shared_examples.rb
@@ -3,6 +3,8 @@
 # Requires an API request:
 #   let(:request) { get api("/projects/#{project.id}/repository/branches", user) }
 shared_examples_for '400 response' do
+  let(:message) { nil }
+
   before do
     # Fires the request
     request
@@ -10,6 +12,10 @@ shared_examples_for '400 response' do
 
   it 'returns 400' do
     expect(response).to have_gitlab_http_status(400)
+
+    if message.present?
+      expect(json_response['message']).to eq(message)
+    end
   end
 end
 
@@ -26,6 +32,7 @@ end
 
 shared_examples_for '404 response' do
   let(:message) { nil }
+
   before do
     # Fires the request
     request