1 files changed, 78 insertions, 0 deletions
diff --git a/spec/javascripts/lib/utils/accessor_spec.js b/spec/javascripts/lib/utils/accessor_spec.js
new file mode 100644
index 00000000000..b768d6f2a68
--- /dev/null
+++ b/spec/javascripts/lib/utils/accessor_spec.js
@@ -0,0 +1,78 @@
+import AccessorUtilities from '~/lib/utils/accessor';
+
+describe('AccessorUtilities', () => {
+  const testError = new Error('test error');
+
+  describe('isPropertyAccessSafe', () => {
+    let base;
+
+    it('should return `true` if access is safe', () => {
+      base = { testProp: 'testProp' };
+
+      expect(AccessorUtilities.isPropertyAccessSafe(base, 'testProp')).toBe(true);
+    });
+
+    it('should return `false` if access throws an error', () => {
+      base = { get testProp() { throw testError; } };
+
+      expect(AccessorUtilities.isPropertyAccessSafe(base, 'testProp')).toBe(false);
+    });
+
+    it('should return `false` if property is undefined', () => {
+      base = {};
+
+      expect(AccessorUtilities.isPropertyAccessSafe(base, 'testProp')).toBe(false);
+    });
+  });
+
+  describe('isFunctionCallSafe', () => {
+    const base = {};
+
+    it('should return `true` if calling is safe', () => {
+      base.func = () => {};
+
+      expect(AccessorUtilities.isFunctionCallSafe(base, 'func')).toBe(true);
+    });
+
+    it('should return `false` if calling throws an error', () => {
+      base.func = () => { throw new Error('test error'); };
+
+      expect(AccessorUtilities.isFunctionCallSafe(base, 'func')).toBe(false);
+    });
+
+    it('should return `false` if function is undefined', () => {
+      base.func = undefined;
+
+      expect(AccessorUtilities.isFunctionCallSafe(base, 'func')).toBe(false);
+    });
+  });
+
+  describe('isLocalStorageAccessSafe', () => {
+    beforeEach(() => {
+      spyOn(window.localStorage, 'setItem');
+      spyOn(window.localStorage, 'removeItem');
+    });
+
+    it('should return `true` if access is safe', () => {
+      expect(AccessorUtilities.isLocalStorageAccessSafe()).toBe(true);
+    });
+
+    it('should return `false` if access to .setItem isnt safe', () => {
+      window.localStorage.setItem.and.callFake(() => { throw testError; });
+
+      expect(AccessorUtilities.isLocalStorageAccessSafe()).toBe(false);
+    });
+
+    it('should set a test item if access is safe', () => {
+      AccessorUtilities.isLocalStorageAccessSafe();
+
+      expect(window.localStorage.setItem).toHaveBeenCalledWith('isLocalStorageAccessSafe', 'true');
+    });
+
+    it('should remove the test item if access is safe', () => {
+      AccessorUtilities.isLocalStorageAccessSafe();
+
+      expect(window.localStorage.removeItem).toHaveBeenCalledWith('isLocalStorageAccessSafe');
+    });
+  });
+});