Test shallowEquality

Author: vramana

src/utils/shallowEqual.js

@@ -18,13 +18,6 @@ export default function shallowEqual(objA, objB) {
 
       return false;
     }
-
-    var valA = objA[keysA[i]];
-    var valB = objB[keysA[i]];
-
-    if (valA !== valB) {
-      return false;
-    }
   }
 
   return true;

test/utils/shallowEquality.spec.js

@@ -0,0 +1,134 @@
+import expect from 'expect';
+import shallowEqualScalar from '../../src/utils/shallowEqualScalar';
+import shallowEqual from '../../src/utils/shallowEqual';
+
+describe('Utils', () => {
+  // More info: https://github.com/gaearon/redux/pull/75#issuecomment-111635748
+  describe('shallowEqualScalar', () => {
+    it('returns true if both arguments are the same object', () => {
+      const o = { a: 1, b: 2 };
+      expect(shallowEqualScalar(o, o)).toBe(true);
+    });
+
+    it('returns false if either argument is null', () => {
+      expect(shallowEqualScalar(null, {})).toBe(false);
+      expect(shallowEqualScalar({}, null)).toBe(false);
+    });
+
+    it('returns true if arguments fields are equal', () => {
+      expect(
+        shallowEqualScalar(
+          { a: 1, b: 2, c: undefined },
+          { a: 1, b: 2, c: undefined }
+        )
+      ).toBe(true);
+
+      expect(
+        shallowEqualScalar(
+          { a: 1, b: 2, c: 3 },
+          { a: 1, b: 2, c: 3 }
+        )
+      ).toBe(true);
+    });
+
+    it('returns false if first argument has too many keys', () => {
+      expect(
+        shallowEqualScalar(
+          { a: 1, b: 2, c: 3 },
+          { a: 1, b: 2 }
+        )
+      ).toBe(false);
+    });
+
+    it('returns false if second argument has too many keys', () => {
+      expect(
+        shallowEqualScalar(
+          { a: 1, b: 2 },
+          { a: 1, b: 2, c: 3 }
+        )
+      ).toBe(false);
+    });
+
+    it('returns false if arguments have keys dont have same value', () => {
+      expect(
+        shallowEqualScalar(
+          { a: 1, b: 2 },
+          { a: 1, b: 3 }
+        )
+      ).toBe(false);
+    });
+
+    it('returns false if arguments have field that are objects', () => {
+      const o = {};
+      expect(
+        shallowEqualScalar(
+          { a: 1, b: 2, c: o },
+          { a: 1, b: 2, c: o }
+        )
+      ).toBe(false);
+    });
+
+    it('returns false if arguments have different keys', () => {
+      expect(
+        shallowEqualScalar(
+          { a: 1, b: 2, c: undefined },
+          { a: 1, bb: 2, c: undefined }
+        )
+      ).toBe(false);
+    });
+  });
+
+  describe('shallowEqual', () => {
+    it('returns true if arguments fields are equal', () => {
+      expect(
+        shallowEqual(
+          { a: 1, b: 2, c: undefined },
+          { a: 1, b: 2, c: undefined }
+        )
+      ).toBe(true);
+
+      expect(
+        shallowEqual(
+          { a: 1, b: 2, c: 3 },
+          { a: 1, b: 2, c: 3 }
+        )
+      ).toBe(true);
+
+      const o = {};
+      expect(
+        shallowEqual(
+          { a: 1, b: 2, c: o },
+          { a: 1, b: 2, c: o }
+        )
+      ).toBe(true);
+    });
+
+    it('returns false if first argument has too many keys', () => {
+      expect(
+        shallowEqual(
+          { a: 1, b: 2, c: 3 },
+          { a: 1, b: 2 }
+        )
+      ).toBe(false);
+    });
+
+    it('returns false if second argument has too many keys', () => {
+      expect(
+        shallowEqual(
+          { a: 1, b: 2 },
+          { a: 1, b: 2, c: 3 }
+        )
+      ).toBe(false);
+    });
+
+    it('returns false if arguments have different keys', () => {
+      expect(
+        shallowEqual(
+          { a: 1, b: 2, c: undefined },
+          { a: 1, bb: 2, c: undefined }
+        )
+      ).toBe(false);
+    });
+  });
+
+});