sinon-test/lib/utils.js

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/**
 * Internal utilities for sinon-test
 */
"use strict";

/**
 * From version 3.1 Sinon uses factory methods for sandboxes and deprecates
 * sinon.sandbox. It - and its exports - will in time be removed/internalized, but
 * we can still support backwards compatibility easily.
 * See Sinon pull request #1515
 */
function isOlderSinonVersion(sinonObj) {
    return (
        typeof sinonObj.createSandbox === "undefined" &&
        Boolean(sinonObj.sandbox) &&
        typeof sinonObj.sandbox === "object" &&
        typeof sinonObj.sandbox.create === "function"
    );
}

exports.isPromise = function (object) {
    return typeof object === "object" && typeof object.then === "function";
};

exports.isSinon = function (obj) {
    var isObject = Boolean(obj) && typeof obj === "object";
    return (
        isObject &&
        (isOlderSinonVersion(obj) || typeof obj.createSandbox === "function")
    );
};