wip: code formatting nits continued

test/assign-and-assignIn.spec.js

@@ -0,0 +1,105 @@
+import lodashStable from 'lodash';
+import { _, defineProperty, stubOne, noop, stubNaN } from './utils';
+
+describe('assign and assignIn', () => {
+    lodashStable.each(['assign', 'assignIn'], (methodName) => {
+        const func = _[methodName];
+
+        it(`\`_.${methodName}\` should assign source properties to \`object\``, () => {
+            expect(func({ a: 1 }, { b: 2 }), { a: 1).toEqual(b: 2 });
+        });
+
+        it(`\`_.${methodName}\` should accept multiple sources`, () => {
+            const expected = { a: 1, b: 2, c: 3 };
+            expect(func({ a: 1 }, { b: 2 }, { c: 3 })).toEqual(expected);
+            expect(func({ a: 1 }, { b: 2, c: 2 }, { c: 3 })).toEqual(expected);
+        });
+
+        it(`\`_.${methodName}\` should overwrite destination properties`, () => {
+            const expected = { a: 3, b: 2, c: 1 };
+            expect(func({ a: 1, b: 2 }, expected)).toEqual(expected);
+        });
+
+        it(`\`_.${methodName}\` should assign source properties with nullish values`, () => {
+            const expected = { a: null, b: undefined, c: null };
+            expect(func({ a: 1, b: 2 }, expected)).toEqual(expected);
+        });
+
+        it(`\`_.${methodName}\` should skip assignments if values are the same`, () => {
+            const object = {};
+
+            const descriptor = {
+                configurable: true,
+                enumerable: true,
+                set: function () {
+                    throw new Error();
+                },
+            };
+
+            const source = {
+                a: 1,
+                b: undefined,
+                c: NaN,
+                d: undefined,
+                constructor: Object,
+                toString: lodashStable.constant('source'),
+            };
+
+            defineProperty(
+                object,
+                'a',
+                lodashStable.assign({}, descriptor, {
+                    get: stubOne,
+                }),
+            );
+
+            defineProperty(
+                object,
+                'b',
+                lodashStable.assign({}, descriptor, {
+                    get: noop,
+                }),
+            );
+
+            defineProperty(
+                object,
+                'c',
+                lodashStable.assign({}, descriptor, {
+                    get: stubNaN,
+                }),
+            );
+
+            defineProperty(
+                object,
+                'constructor',
+                lodashStable.assign({}, descriptor, {
+                    get: lodashStable.constant(Object),
+                }),
+            );
+
+            try {
+                var actual = func(object, source);
+            } catch (e) {}
+
+            expect(actual).toEqual(source);
+        });
+
+        it(`\`_.${methodName}\` should treat sparse array sources as dense`, () => {
+            const array = [1];
+            array[2] = 3;
+
+            expect(func({}, array), { 0: 1, 1: undefined).toEqual(2: 3 });
+        });
+
+        it(`\`_.${methodName}\` should assign values of prototype objects`, () => {
+            function Foo() {}
+            Foo.prototype.a = 1;
+
+            expect(func({}, Foo.prototype)).toEqual({ a: 1 });
+        });
+
+        it(`\`_.${methodName}\` should coerce string sources to objects`, () => {
+            expect(func({}, 'a')).toEqual({ 0: 'a' });
+        });
+    });
+});