1 files changed, 52 insertions, 0 deletions
diff --git a/spec/frontend/behaviors/gl_emoji/unicode_support_map_spec.js b/spec/frontend/behaviors/gl_emoji/unicode_support_map_spec.js
new file mode 100644
index 00000000000..aaee9c30cac
--- /dev/null
+++ b/spec/frontend/behaviors/gl_emoji/unicode_support_map_spec.js
@@ -0,0 +1,52 @@
+import getUnicodeSupportMap from '~/emoji/support/unicode_support_map';
+import AccessorUtilities from '~/lib/utils/accessor';
+import { useLocalStorageSpy } from 'helpers/local_storage_helper';
+
+describe('Unicode Support Map', () => {
+  useLocalStorageSpy();
+  describe('getUnicodeSupportMap', () => {
+    const stringSupportMap = 'stringSupportMap';
+
+    beforeEach(() => {
+      jest.spyOn(AccessorUtilities, 'isLocalStorageAccessSafe').mockImplementation(() => {});
+      jest.spyOn(JSON, 'parse').mockImplementation(() => {});
+      jest.spyOn(JSON, 'stringify').mockReturnValue(stringSupportMap);
+    });
+
+    describe('if isLocalStorageAvailable is `true`', () => {
+      beforeEach(() => {
+        jest.spyOn(AccessorUtilities, 'isLocalStorageAccessSafe').mockReturnValue(true);
+
+        getUnicodeSupportMap();
+      });
+
+      it('should call .getItem and .setItem', () => {
+        const getArgs = window.localStorage.getItem.mock.calls;
+        const setArgs = window.localStorage.setItem.mock.calls;
+
+        expect(getArgs[0][0]).toBe('gl-emoji-version');
+        expect(getArgs[1][0]).toBe('gl-emoji-user-agent');
+
+        expect(setArgs[0][0]).toBe('gl-emoji-version');
+        expect(setArgs[0][1]).toBe('0.2.0');
+        expect(setArgs[1][0]).toBe('gl-emoji-user-agent');
+        expect(setArgs[1][1]).toBe(navigator.userAgent);
+        expect(setArgs[2][0]).toBe('gl-emoji-unicode-support-map');
+        expect(setArgs[2][1]).toBe(stringSupportMap);
+      });
+    });
+
+    describe('if isLocalStorageAvailable is `false`', () => {
+      beforeEach(() => {
+        jest.spyOn(AccessorUtilities, 'isLocalStorageAccessSafe').mockReturnValue(false);
+
+        getUnicodeSupportMap();
+      });
+
+      it('should not call .getItem or .setItem', () => {
+        expect(window.localStorage.getItem.mock.calls.length).toBe(1);
+        expect(window.localStorage.setItem).not.toHaveBeenCalled();
+      });
+    });
+  });
+});