test(hashKey): add tests for hashKey()

test/ApiSpecs.js

@@ -1,6 +1,72 @@
 'use strict';
 
 describe('api', function() {
+  describe('hashKey()', function() {
+    it('should use an existing `$$hashKey`', function() {
+      var obj = {$$hashKey: 'foo'};
+      expect(hashKey(obj)).toBe('foo');
+    });
+
+    it('should support a function as `$$hashKey` (and call it)', function() {
+      var obj = {$$hashKey: valueFn('foo')};
+      expect(hashKey(obj)).toBe('foo');
+    });
+
+    it('should create a new `$$hashKey` if none exists (and return it)', function() {
+      var obj = {};
+      expect(hashKey(obj)).toBe(obj.$$hashKey);
+      expect(obj.$$hashKey).toBeDefined();
+    });
+
+    it('should create appropriate `$$hashKey`s for primitive values', function() {
+      expect(hashKey(undefined)).toBe(hashKey(undefined));
+      expect(hashKey(null)).toBe(hashKey(null));
+      expect(hashKey(null)).not.toBe(hashKey(undefined));
+      expect(hashKey(true)).toBe(hashKey(true));
+      expect(hashKey(false)).toBe(hashKey(false));
+      expect(hashKey(false)).not.toBe(hashKey(true));
+      expect(hashKey(42)).toBe(hashKey(42));
+      expect(hashKey(1337)).toBe(hashKey(1337));
+      expect(hashKey(1337)).not.toBe(hashKey(42));
+      expect(hashKey('foo')).toBe(hashKey('foo'));
+      expect(hashKey('foo')).not.toBe(hashKey('bar'));
+    });
+
+    it('should create appropriate `$$hashKey`s for non-primitive values', function() {
+      var fn = function() {};
+      var arr = [];
+      var obj = {};
+      var date = new Date();
+
+      expect(hashKey(fn)).toBe(hashKey(fn));
+      expect(hashKey(fn)).not.toBe(hashKey(function() {}));
+      expect(hashKey(arr)).toBe(hashKey(arr));
+      expect(hashKey(arr)).not.toBe(hashKey([]));
+      expect(hashKey(obj)).toBe(hashKey(obj));
+      expect(hashKey(obj)).not.toBe(hashKey({}));
+      expect(hashKey(date)).toBe(hashKey(date));
+      expect(hashKey(date)).not.toBe(hashKey(new Date()));
+    });
+
+    it('should support a custom `nextUidFn`', function() {
+      var nextUidFn = jasmine.createSpy('nextUidFn').and.returnValues('foo', 'bar', 'baz', 'qux');
+
+      var fn = function() {};
+      var arr = [];
+      var obj = {};
+      var date = new Date();
+
+      hashKey(fn, nextUidFn);
+      hashKey(arr, nextUidFn);
+      hashKey(obj, nextUidFn);
+      hashKey(date, nextUidFn);
+
+      expect(fn.$$hashKey).toBe('function:foo');
+      expect(arr.$$hashKey).toBe('object:bar');
+      expect(obj.$$hashKey).toBe('object:baz');
+      expect(date.$$hashKey).toBe('object:qux');
+    });
+  });
 
   describe('HashMap', function() {
     it('should do basic crud', function() {