1 files changed, 89 insertions, 0 deletions
diff --git a/spec/javascripts/frequent_items/utils_spec.js b/spec/javascripts/frequent_items/utils_spec.js
new file mode 100644
index 00000000000..cd27d79b29a
--- /dev/null
+++ b/spec/javascripts/frequent_items/utils_spec.js
@@ -0,0 +1,89 @@
+import bp from '~/breakpoints';
+import { isMobile, getTopFrequentItems, updateExistingFrequentItem } from '~/frequent_items/utils';
+import { HOUR_IN_MS, FREQUENT_ITEMS } from '~/frequent_items/constants';
+import { mockProject, unsortedFrequentItems, sortedFrequentItems } from './mock_data';
+
+describe('Frequent Items utils spec', () => {
+  describe('isMobile', () => {
+    it('returns true when the screen is small ', () => {
+      spyOn(bp, 'getBreakpointSize').and.returnValue('sm');
+
+      expect(isMobile()).toBe(true);
+    });
+
+    it('returns true when the screen is extra-small ', () => {
+      spyOn(bp, 'getBreakpointSize').and.returnValue('xs');
+
+      expect(isMobile()).toBe(true);
+    });
+
+    it('returns false when the screen is larger than small ', () => {
+      spyOn(bp, 'getBreakpointSize').and.returnValue('md');
+
+      expect(isMobile()).toBe(false);
+    });
+  });
+
+  describe('getTopFrequentItems', () => {
+    it('returns empty array if no items provided', () => {
+      const result = getTopFrequentItems();
+
+      expect(result.length).toBe(0);
+    });
+
+    it('returns correct amount of items for mobile', () => {
+      spyOn(bp, 'getBreakpointSize').and.returnValue('sm');
+      const result = getTopFrequentItems(unsortedFrequentItems);
+
+      expect(result.length).toBe(FREQUENT_ITEMS.LIST_COUNT_MOBILE);
+    });
+
+    it('returns correct amount of items for desktop', () => {
+      spyOn(bp, 'getBreakpointSize').and.returnValue('lg');
+      const result = getTopFrequentItems(unsortedFrequentItems);
+
+      expect(result.length).toBe(FREQUENT_ITEMS.LIST_COUNT_DESKTOP);
+    });
+
+    it('sorts frequent items in order of frequency and lastAccessedOn', () => {
+      spyOn(bp, 'getBreakpointSize').and.returnValue('lg');
+      const result = getTopFrequentItems(unsortedFrequentItems);
+      const expectedResult = sortedFrequentItems.slice(0, FREQUENT_ITEMS.LIST_COUNT_DESKTOP);
+
+      expect(result).toEqual(expectedResult);
+    });
+  });
+
+  describe('updateExistingFrequentItem', () => {
+    let mockedProject;
+
+    beforeEach(() => {
+      mockedProject = {
+        ...mockProject,
+        frequency: 1,
+        lastAccessedOn: 1497979281815,
+      };
+    });
+
+    it('updates item if accessed over an hour ago', () => {
+      const newTimestamp = Date.now() + HOUR_IN_MS + 1;
+      const newItem = {
+        ...mockedProject,
+        lastAccessedOn: newTimestamp,
+      };
+      const result = updateExistingFrequentItem(mockedProject, newItem);
+
+      expect(result.frequency).toBe(mockedProject.frequency + 1);
+    });
+
+    it('does not update item if accessed within the hour', () => {
+      const newItem = {
+        ...mockedProject,
+        lastAccessedOn: mockedProject.lastAccessedOn + HOUR_IN_MS,
+      };
+      const result = updateExistingFrequentItem(mockedProject, newItem);
+
+      expect(result.frequency).toBe(mockedProject.frequency);
+    });
+  });
+});