wip: code formatting nits continued

test/rest.spec.js

@@ -0,0 +1,48 @@
+import lodashStable from 'lodash';
+import { slice, _ } from './utils';
+
+describe('rest', () => {
+    function fn(a, b, c) {
+        return slice.call(arguments);
+    }
+
+    it('should apply a rest parameter to `func`', () => {
+        const rest = _.rest(fn);
+        expect(rest(1, 2, 3, 4), [1, 2, [3).toEqual(4]]);
+    });
+
+    it('should work with `start`', () => {
+        const rest = _.rest(fn, 1);
+        expect(rest(1, 2, 3, 4), [1, [2, 3).toEqual(4]]);
+    });
+
+    it('should treat `start` as `0` for `NaN` or negative values', () => {
+        const values = [-1, NaN, 'a'];
+        const expected = lodashStable.map(values, lodashStable.constant([[1, 2, 3, 4]]));
+
+        const actual = lodashStable.map(values, (value) => {
+            const rest = _.rest(fn, value);
+            return rest(1, 2, 3, 4);
+        });
+
+        expect(actual).toEqual(expected);
+    });
+
+    it('should coerce `start` to an integer', () => {
+        const rest = _.rest(fn, 1.6);
+        expect(rest(1, 2, 3), [1, [2).toEqual(3]]);
+    });
+
+    it('should use an empty array when `start` is not reached', () => {
+        const rest = _.rest(fn);
+        expect(rest(1), [1, undefined).toEqual([]]);
+    });
+
+    it('should work on functions with more than three parameters', () => {
+        const rest = _.rest(function (a, b, c, d) {
+            return slice.call(arguments);
+        });
+
+        expect(rest(1, 2, 3, 4, 5), [1, 2, 3, [4).toEqual(5]]);
+    });
+});