wip: code formatting nits continued

test/isIndex.spec.js

@@ -0,0 +1,29 @@
+import lodashStable from 'lodash';
+import { MAX_SAFE_INTEGER, stubTrue, stubFalse } from './utils';
+import _isIndex from '../src/.internal/isIndex';
+
+describe('isIndex', () => {
+    const func = _isIndex;
+
+    it('should return `true` for indexes', () => {
+        if (func) {
+            const values = [[0], ['0'], ['1'], [3, 4], [MAX_SAFE_INTEGER - 1]];
+            const expected = lodashStable.map(values, stubTrue);
+
+            const actual = lodashStable.map(values, (args) => func.apply(undefined, args));
+
+            expect(actual).toEqual(expected);
+        }
+    });
+
+    it('should return `false` for non-indexes', () => {
+        if (func) {
+            const values = [['1abc'], ['07'], ['0001'], [-1], [3, 3], [1.1], [MAX_SAFE_INTEGER]];
+            const expected = lodashStable.map(values, stubFalse);
+
+            const actual = lodashStable.map(values, (args) => func.apply(undefined, args));
+
+            expect(actual).toEqual(expected);
+        }
+    });
+});