it("should return false if given object does not contain a then function", () => {
var capability = abstract.newPromiseCapability(Promise);
abstract.updatePromiseFromPotentialThenable(null, capability).should.be.false;
abstract.updatePromiseFromPotentialThenable(undefined, capability).should.be.false;
abstract.updatePromiseFromPotentialThenable({}, capability).should.be.false;
abstract.updatePromiseFromPotentialThenable({ then: {} }, capability).should.be.false;
abstract.updatePromiseFromPotentialThenable({ then: "flux" }, capability).should.be.false;
});
it("should return true if contains a then function even if it throws", () => {
var capability = abstract.newPromiseCapability(Promise),
thenable = {
then: () => { throw new Error("this is an error"); }
};
abstract.updatePromiseFromPotentialThenable(thenable, capability).should.be.true;
});
it("should return true if contains a then function", () => {
var capability = abstract.newPromiseCapability(Promise),
thenable = {
then: commonHelpers.noop()
};
abstract.updatePromiseFromPotentialThenable(thenable, capability).should.be.true;
});
it("should reject capability if potential then function throws an error", () => {
var capability = abstract.newPromiseCapability(Promise),
capabilityRejectStub = sinon.stub(capability, "reject"),
expectedError = new Error("this is an error"),
thenable = {
then: () => { throw expectedError; }
};
abstract.updatePromiseFromPotentialThenable(thenable, capability).should.be.true;
sinon.assert.calledOnce(capabilityRejectStub);
sinon.assert.calledWithExactly(capabilityRejectStub, expectedError);
});