var test = require("tape") var extend = require("./") var mutableExtend = require("./mutable") test("merge", function(assert) { var a = { a: "foo" } var b = { b: "bar" } assert.deepEqual(extend(a, b), { a: "foo", b: "bar" }) assert.end() }) test("replace", function(assert) { var a = { a: "foo" } var b = { a: "bar" } assert.deepEqual(extend(a, b), { a: "bar" }) assert.end() }) test("undefined", function(assert) { var a = { a: undefined } var b = { b: "foo" } assert.deepEqual(extend(a, b), { a: undefined, b: "foo" }) assert.deepEqual(extend(b, a), { a: undefined, b: "foo" }) assert.end() }) test("handle 0", function(assert) { var a = { a: "default" } var b = { a: 0 } assert.deepEqual(extend(a, b), { a: 0 }) assert.deepEqual(extend(b, a), { a: "default" }) assert.end() }) test("is immutable", function (assert) { var record = {} extend(record, { foo: "bar" }) assert.equal(record.foo, undefined) assert.end() }) test("null as argument", function (assert) { var a = { foo: "bar" } var b = null var c = void 0 assert.deepEqual(extend(b, a, c), { foo: "bar" }) assert.end() }) test("mutable", function (assert) { var a = { foo: "bar" } mutableExtend(a, { bar: "baz" }) assert.equal(a.bar, "baz") assert.end() })