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is.js
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"use strict"; var assert = require("chai").assert , isPromise = require("../../promise/is"); describe("promise/is", function () { if (typeof Promise === "function") { it("Should return true on promise", function () { assert.equal(isPromise(Promise.resolve()), true); }); } it("Should return false on non-promise thenable", function () { assert.equal(isPromise({ then: function () { return true; } }), false); }); it("Should return false on plain object", function () { assert.equal(isPromise({}), false); }); it("Should return false on function", function () { assert.equal(isPromise(function () { return true; }), false); }); it("Should return false on array", function () { assert.equal(isPromise([]), false); }); if (typeof Object.create === "function") { it("Should return false on object with no prototype", function () { assert.equal(isPromise(Object.create(null)), false); }); } it("Should return false on string", function () { assert.equal(isPromise("foo"), false); }); it("Should return false on empty string", function () { assert.equal(isPromise(""), false); }); it("Should return false on number", function () { assert.equal(isPromise(123), false); }); it("Should return false on NaN", function () { assert.equal(isPromise(NaN), false); }); it("Should return false on boolean", function () { assert.equal(isPromise(true), false); }); if (typeof Symbol === "function") { it("Should return false on symbol", function () { assert.equal(isPromise(Symbol("foo")), false); }); } it("Should return false on null", function () { assert.equal(isPromise(null), false); }); it("Should return false on undefined", function () { assert.equal(isPromise(void 0), false); }); });