From 05b40641883b0502b8b849679f4c583a3e61db2a Mon Sep 17 00:00:00 2001 From: Matthew Wild Date: Thu, 18 Oct 2018 18:03:31 +0100 Subject: util.promise: Add promise.try() --- spec/util_promise_spec.lua | 51 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) (limited to 'spec') diff --git a/spec/util_promise_spec.lua b/spec/util_promise_spec.lua index 778a7661..c2a8ba95 100644 --- a/spec/util_promise_spec.lua +++ b/spec/util_promise_spec.lua @@ -331,4 +331,55 @@ describe("util.promise", function () assert.spy(on_finally_err).was_called_with(test_error); end); end); + describe("try()", function () + it("works with functions that return a promise", function () + local resolve; + local p = promise.try(function () + return promise.new(function (_resolve) + resolve = _resolve; + end); + end); + assert.is_function(resolve); + local on_resolved = spy.new(function () end); + p:next(on_resolved); + assert.spy(on_resolved).was_not_called(); + resolve("foo"); + assert.spy(on_resolved).was_called_with("foo"); + end); + + it("works with functions that return a value", function () + local p = promise.try(function () + return "foo"; + end); + local on_resolved = spy.new(function () end); + p:next(on_resolved); + assert.spy(on_resolved).was_called_with("foo"); + end); + + it("works with functions that return a promise that rejects", function () + local reject; + local p = promise.try(function () + return promise.new(function (_, _reject) + reject = _reject; + end); + end); + assert.is_function(reject); + local on_rejected = spy.new(function () end); + p:catch(on_rejected); + assert.spy(on_rejected).was_not_called(); + reject("foo"); + assert.spy(on_rejected).was_called_with("foo"); + end); + + it("works with functions that throw errors", function () + local test_error = {}; + local p = promise.try(function () + error(test_error); + end); + local on_rejected = spy.new(function () end); + p:catch(on_rejected); + assert.spy(on_rejected).was_called(1); + assert.spy(on_rejected).was_called_with(test_error); + end); + end); end); -- cgit v1.2.3