1 files changed, 65 insertions, 0 deletions
diff --git a/spec/requests/api/users_preferences_spec.rb b/spec/requests/api/users_preferences_spec.rb
new file mode 100644
index 00000000000..db03786ed2a
--- /dev/null
+++ b/spec/requests/api/users_preferences_spec.rb
@@ -0,0 +1,65 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe API::Users do
+  let_it_be(:user) { create(:user) }
+
+  describe 'PUT /user/preferences/' do
+    context "with correct attributes and a logged in user" do
+      it 'returns a success status and the value has been changed' do
+        put api("/user/preferences", user), params: { view_diffs_file_by_file: true }
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(json_response['view_diffs_file_by_file']).to eq(true)
+        expect(user.reload.view_diffs_file_by_file).to be_truthy
+      end
+    end
+
+    context "missing a preference" do
+      it 'returns a bad request status' do
+        put api("/user/preferences", user), params: {}
+
+        expect(response).to have_gitlab_http_status(:bad_request)
+      end
+    end
+
+    context "without a logged in user" do
+      it 'returns an unauthorized status' do
+        put api("/user/preferences"), params: { view_diffs_file_by_file: true }
+
+        expect(response).to have_gitlab_http_status(:unauthorized)
+      end
+    end
+
+    context "with an unsupported preference" do
+      it 'returns a bad parameter' do
+        put api("/user/preferences", user), params: { jawn: true }
+
+        expect(response).to have_gitlab_http_status(:bad_request)
+      end
+    end
+
+    context "with an unsupported value" do
+      it 'returns a bad parameter' do
+        put api("/user/preferences", user), params: { view_diffs_file_by_file: 3 }
+
+        expect(response).to have_gitlab_http_status(:bad_request)
+      end
+    end
+
+    context "with an update service failure" do
+      it 'returns a bad request' do
+        bad_service = double("Failed Service", success?: false)
+
+        allow_next_instance_of(::UserPreferences::UpdateService) do |instance|
+          allow(instance).to receive(:execute).and_return(bad_service)
+        end
+
+        put api("/user/preferences", user), params: { view_diffs_file_by_file: true }
+
+        expect(response).to have_gitlab_http_status(:bad_request)
+      end
+    end
+  end
+end