Init

Nodejs/node_modules/es5-ext/test/object/is-plain-object.js

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+"use strict";
+
+module.exports = function (t, a) {
+	a(t({}), true, "Empty {} is plain object");
+	a(t({ a: true }), true, "{} with property is plain object");
+	a(
+		t({ prototype: 1, constructor: 2, __proto__: 3 }), true,
+		"{} with any property keys is plain object"
+	);
+	a(t(null), false, "Null is not plain object");
+	a(t("string"), false, "Primitive is not plain object");
+	a(t(function () {}), false, "Function is not plain object");
+	a(
+		t(Object.create({})), false,
+		"Object whose prototype is not Object.prototype is not plain object"
+	);
+	a(
+		t(Object.create(Object.prototype)), true,
+		"Object whose prototype is Object.prototype is plain object"
+	);
+	a(t(Object.create(null)), true, "Object whose prototype is null is plain object");
+	a(t(Object.prototype), false, "Object.prototype");
+};