1 files changed, 41 insertions, 0 deletions
diff --git a/spec/frontend/droplab/plugins/ajax_spec.js b/spec/frontend/droplab/plugins/ajax_spec.js
new file mode 100644
index 00000000000..1d7576ce420
--- /dev/null
+++ b/spec/frontend/droplab/plugins/ajax_spec.js
@@ -0,0 +1,41 @@
+import AjaxCache from '~/lib/utils/ajax_cache';
+import Ajax from '~/droplab/plugins/ajax';
+
+describe('Ajax', () => {
+  describe('preprocessing', () => {
+    const config = {};
+
+    describe('is not configured', () => {
+      it('passes the data through', () => {
+        const data = ['data'];
+
+        expect(Ajax.preprocessing(config, data)).toEqual(data);
+      });
+    });
+
+    describe('is configured', () => {
+      const processedArray = ['processed'];
+
+      beforeEach(() => {
+        config.preprocessing = () => processedArray;
+        jest.spyOn(config, 'preprocessing').mockImplementation(() => processedArray);
+      });
+
+      it('calls preprocessing', () => {
+        Ajax.preprocessing(config, []);
+
+        expect(config.preprocessing.mock.calls.length).toBe(1);
+      });
+
+      it('overrides AjaxCache', () => {
+        jest.spyOn(AjaxCache, 'override').mockImplementation((endpoint, results) => {
+          expect(results).toEqual(processedArray);
+        });
+
+        Ajax.preprocessing(config, []);
+
+        expect(AjaxCache.override.mock.calls.length).toBe(1);
+      });
+    });
+  });
+});