wip: code formatting nits continued

test/spread.spec.js

@@ -0,0 +1,57 @@
+import lodashStable from 'lodash';
+import { slice, _, stubTrue, falsey } from './utils';
+
+describe('spread', () => {
+    function fn(a, b, c) {
+        return slice.call(arguments);
+    }
+
+    it('should spread arguments to `func`', () => {
+        const spread = _.spread(fn);
+        const expected = [1, 2];
+
+        expect(spread([1, 2])).toEqual(expected);
+        expect(spread([1, 2], 3)).toEqual(expected);
+    });
+
+    it('should accept a falsey `array`', () => {
+        const spread = _.spread(stubTrue);
+        const expected = lodashStable.map(falsey, stubTrue);
+
+        const actual = lodashStable.map(falsey, (array, index) => {
+            try {
+                return index ? spread(array) : spread();
+            } catch (e) {}
+        });
+
+        expect(actual).toEqual(expected);
+    });
+
+    it('should work with `start`', () => {
+        const spread = _.spread(fn, 1);
+        const expected = [1, 2, 3];
+
+        expect(spread(1, [2, 3])).toEqual(expected);
+        expect(spread(1, [2, 3], 4)).toEqual(expected);
+    });
+
+    it('should treat `start` as `0` for negative or `NaN` values', () => {
+        const values = [-1, NaN, 'a'];
+        const expected = lodashStable.map(values, lodashStable.constant([1, 2]));
+
+        const actual = lodashStable.map(values, (value) => {
+            const spread = _.spread(fn, value);
+            return spread([1, 2]);
+        });
+
+        expect(actual).toEqual(expected);
+    });
+
+    it('should coerce `start` to an integer', () => {
+        const spread = _.spread(fn, 1.6);
+        const expected = [1, 2, 3];
+
+        expect(spread(1, [2, 3])).toEqual(expected);
+        expect(spread(1, [2, 3], 4)).toEqual(expected);
+    });
+});