wip: code formatting nits continued

test/indexOf.spec.js

@@ -0,0 +1,53 @@
+import lodashStable from 'lodash';
+import { stubZero, falsey } from './utils';
+import indexOf from '../src/indexOf';
+
+describe('indexOf', () => {
+    const array = [1, 2, 3, 1, 2, 3];
+
+    it('`_.indexOf` should return the index of the first matched value', () => {
+        expect(indexOf(array, 3)).toBe(2);
+    });
+
+    it('`_.indexOf` should work with a positive `fromIndex`', () => {
+        expect(indexOf(array, 1, 2)).toBe(3);
+    });
+
+    it('`_.indexOf` should work with a `fromIndex` >= `length`', () => {
+        const values = [6, 8, 2 ** 32, Infinity];
+        const expected = lodashStable.map(values, lodashStable.constant([-1, -1, -1]));
+
+        const actual = lodashStable.map(values, (fromIndex) => [
+            indexOf(array, undefined, fromIndex),
+            indexOf(array, 1, fromIndex),
+            indexOf(array, '', fromIndex),
+        ]);
+
+        expect(actual).toEqual(expected);
+    });
+
+    it('`_.indexOf` should work with a negative `fromIndex`', () => {
+        expect(indexOf(array, 2, -3)).toBe(4);
+    });
+
+    it('`_.indexOf` should work with a negative `fromIndex` <= `-length`', () => {
+        const values = [-6, -8, -Infinity];
+        const expected = lodashStable.map(values, stubZero);
+
+        const actual = lodashStable.map(values, (fromIndex) => indexOf(array, 1, fromIndex));
+
+        expect(actual).toEqual(expected);
+    });
+
+    it('`_.indexOf` should treat falsey `fromIndex` values as `0`', () => {
+        const expected = lodashStable.map(falsey, stubZero);
+
+        const actual = lodashStable.map(falsey, (fromIndex) => indexOf(array, 1, fromIndex));
+
+        expect(actual).toEqual(expected);
+    });
+
+    it('`_.indexOf` should coerce `fromIndex` to an integer', () => {
+        expect(indexOf(array, 2, 1.2)).toBe(1);
+    });
+});