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-rw-r--r--spec/util_promise_spec.lua497
1 files changed, 497 insertions, 0 deletions
diff --git a/spec/util_promise_spec.lua b/spec/util_promise_spec.lua
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+local promise = require "util.promise";
+
+describe("util.promise", function ()
+ --luacheck: ignore 212/resolve 212/reject
+ describe("new()", function ()
+ it("returns a promise object", function ()
+ assert(promise.new());
+ end);
+ end);
+ it("notifies immediately for fulfilled promises", function ()
+ local p = promise.new(function (resolve)
+ resolve("foo");
+ end);
+ local cb = spy.new(function (v)
+ assert.equal("foo", v);
+ end);
+ p:next(cb);
+ assert.spy(cb).was_called(1);
+ end);
+ it("notifies on fulfilment of pending promises", function ()
+ local r;
+ local p = promise.new(function (resolve)
+ r = resolve;
+ end);
+ local cb = spy.new(function (v)
+ assert.equal("foo", v);
+ end);
+ p:next(cb);
+ assert.spy(cb).was_called(0);
+ r("foo");
+ assert.spy(cb).was_called(1);
+ end);
+ it("allows chaining :next() calls", function ()
+ local r;
+ local result;
+ local p = promise.new(function (resolve)
+ r = resolve;
+ end);
+ local cb1 = spy.new(function (v)
+ assert.equal("foo", v);
+ return "bar";
+ end);
+ local cb2 = spy.new(function (v)
+ assert.equal("bar", v);
+ result = v;
+ end);
+ p:next(cb1):next(cb2);
+ assert.spy(cb1).was_called(0);
+ assert.spy(cb2).was_called(0);
+ r("foo");
+ assert.spy(cb1).was_called(1);
+ assert.spy(cb2).was_called(1);
+ assert.equal("bar", result);
+ end);
+ it("supports multiple :next() calls on the same promise", function ()
+ local r;
+ local result;
+ local p = promise.new(function (resolve)
+ r = resolve;
+ end);
+ local cb1 = spy.new(function (v)
+ assert.equal("foo", v);
+ result = v;
+ end);
+ local cb2 = spy.new(function (v)
+ assert.equal("foo", v);
+ result = v;
+ end);
+ p:next(cb1);
+ p:next(cb2);
+ assert.spy(cb1).was_called(0);
+ assert.spy(cb2).was_called(0);
+ r("foo");
+ assert.spy(cb1).was_called(1);
+ assert.spy(cb2).was_called(1);
+ assert.equal("foo", result);
+ end);
+ it("automatically rejects on error", function ()
+ local r;
+ local p = promise.new(function (resolve)
+ r = resolve;
+ error("oh no");
+ end);
+ local cb = spy.new(function () end);
+ local err_cb = spy.new(function (v)
+ assert.equal("oh no", v);
+ end);
+ p:next(cb, err_cb);
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(1);
+ r("foo");
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(1);
+ end);
+ it("supports reject()", function ()
+ local r, result;
+ local p = promise.new(function (resolve, reject)
+ r = reject;
+ end);
+ local cb = spy.new(function () end);
+ local err_cb = spy.new(function (v)
+ result = v;
+ assert.equal("oh doh", v);
+ end);
+ p:next(cb, err_cb);
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(0);
+ r("oh doh");
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(1);
+ assert.equal("oh doh", result);
+ end);
+ it("supports chaining of rejected promises", function ()
+ local r, result;
+ local p = promise.new(function (resolve, reject)
+ r = reject;
+ end);
+ local cb = spy.new(function () end);
+ local err_cb = spy.new(function (v)
+ result = v;
+ assert.equal("oh doh", v);
+ return "ok"
+ end);
+ local cb2 = spy.new(function (v)
+ result = v;
+ end);
+ local err_cb2 = spy.new(function () end);
+ p:next(cb, err_cb):next(cb2, err_cb2)
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(0);
+ assert.spy(cb2).was_called(0);
+ assert.spy(err_cb2).was_called(0);
+ r("oh doh");
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(1);
+ assert.spy(cb2).was_called(1);
+ assert.spy(err_cb2).was_called(0);
+ assert.equal("ok", result);
+ end);
+
+ it("propagates errors down the chain, even when some handlers are not provided", function ()
+ local r, result;
+ local test_error = {};
+ local p = promise.new(function (resolve, reject)
+ r = reject;
+ end);
+ local cb = spy.new(function () end);
+ local err_cb = spy.new(function (e) result = e end);
+ local p2 = p:next(function () error(test_error) end);
+ local p3 = p2:next(cb)
+ p3:catch(err_cb);
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(0);
+ r("oh doh");
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(1);
+ assert.spy(err_cb).was_called_with("oh doh");
+ assert.equal("oh doh", result);
+ end);
+
+ it("propagates values down the chain, even when some handlers are not provided", function ()
+ local r;
+ local p = promise.new(function (resolve, reject)
+ r = resolve;
+ end);
+ local cb = spy.new(function () end);
+ local err_cb = spy.new(function () end);
+ local p2 = p:next(function (v) return v; end);
+ local p3 = p2:catch(err_cb)
+ p3:next(cb);
+ assert.spy(cb).was_called(0);
+ assert.spy(err_cb).was_called(0);
+ r(1337);
+ assert.spy(cb).was_called(1);
+ assert.spy(cb).was_called_with(1337);
+ assert.spy(err_cb).was_called(0);
+ end);
+
+ it("fulfilled promises do not call error handlers and do propagate value", function ()
+ local p = promise.resolve("foo");
+ local cb = spy.new(function () end);
+ local p2 = p:catch(cb);
+ assert.spy(cb).was_called(0);
+
+ local cb2 = spy.new(function () end);
+ p2:catch(cb2);
+ assert.spy(cb2).was_called(0);
+ end);
+
+ it("rejected promises do not call fulfilled handlers and do propagate reason", function ()
+ local p = promise.reject("foo");
+ local cb = spy.new(function () end);
+ local p2 = p:next(cb);
+ assert.spy(cb).was_called(0);
+
+ local cb2 = spy.new(function () end);
+ local cb2_err = spy.new(function () end);
+ p2:next(cb2, cb2_err);
+ assert.spy(cb2).was_called(0);
+ assert.spy(cb2_err).was_called(1);
+ assert.spy(cb2_err).was_called_with("foo");
+ end);
+
+ describe("allows callbacks to return", function ()
+ it("pending promises", function ()
+ local r;
+ local p = promise.resolve()
+ local cb = spy.new(function ()
+ return promise.new(function (resolve)
+ r = resolve;
+ end);
+ end);
+ local cb2 = spy.new(function () end);
+ p:next(cb):next(cb2);
+ assert.spy(cb).was_called(1);
+ assert.spy(cb2).was_called(0);
+ r("hello");
+ assert.spy(cb).was_called(1);
+ assert.spy(cb2).was_called(1);
+ assert.spy(cb2).was_called_with("hello");
+ end);
+
+ it("resolved promises", function ()
+ local p = promise.resolve()
+ local cb = spy.new(function ()
+ return promise.resolve("hello");
+ end);
+ local cb2 = spy.new(function () end);
+ p:next(cb):next(cb2);
+ assert.spy(cb).was_called(1);
+ assert.spy(cb2).was_called(1);
+ assert.spy(cb2).was_called_with("hello");
+ end);
+
+ it("rejected promises", function ()
+ local p = promise.resolve()
+ local cb = spy.new(function ()
+ return promise.reject("hello");
+ end);
+ local cb2 = spy.new(function ()
+ return promise.reject("goodbye");
+ end);
+ local cb3 = spy.new(function () end);
+ p:next(cb):catch(cb2):catch(cb3);
+ assert.spy(cb).was_called(1);
+ assert.spy(cb2).was_called(1);
+ assert.spy(cb2).was_called_with("hello");
+ assert.spy(cb3).was_called(1);
+ assert.spy(cb3).was_called_with("goodbye");
+ end);
+ end);
+
+ describe("race()", function ()
+ it("works with fulfilled promises", function ()
+ local p1, p2 = promise.resolve("yep"), promise.resolve("nope");
+ local p = promise.race({ p1, p2 });
+ local result;
+ p:next(function (v)
+ result = v;
+ end);
+ assert.equal("yep", result);
+ end);
+ it("works with pending promises", function ()
+ local r1, r2;
+ local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
+ local p = promise.race({ p1, p2 });
+
+ local result;
+ local cb = spy.new(function (v)
+ result = v;
+ end);
+ p:next(cb);
+ assert.spy(cb).was_called(0);
+ r2("yep");
+ r1("nope");
+ assert.spy(cb).was_called(1);
+ assert.equal("yep", result);
+ end);
+ end);
+ describe("all()", function ()
+ it("works with fulfilled promises", function ()
+ local p1, p2 = promise.resolve("yep"), promise.resolve("nope");
+ local p = promise.all({ p1, p2 });
+ local result;
+ p:next(function (v)
+ result = v;
+ end);
+ assert.same({ "yep", "nope" }, result);
+ end);
+ it("works with pending promises", function ()
+ local r1, r2;
+ local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
+ local p = promise.all({ p1, p2 });
+
+ local result;
+ local cb = spy.new(function (v)
+ result = v;
+ end);
+ p:next(cb);
+ assert.spy(cb).was_called(0);
+ r2("yep");
+ assert.spy(cb).was_called(0);
+ r1("nope");
+ assert.spy(cb).was_called(1);
+ assert.same({ "nope", "yep" }, result);
+ end);
+ it("rejects if any promise rejects", function ()
+ local r1, r2;
+ local p1 = promise.new(function (resolve, reject) r1 = reject end);
+ local p2 = promise.new(function (resolve, reject) r2 = reject end);
+ local p = promise.all({ p1, p2 });
+
+ local result;
+ local cb = spy.new(function (v)
+ result = v;
+ end);
+ local cb_err = spy.new(function (v)
+ result = v;
+ end);
+ p:next(cb, cb_err);
+ assert.spy(cb).was_called(0);
+ assert.spy(cb_err).was_called(0);
+ r2("fail");
+ assert.spy(cb).was_called(0);
+ assert.spy(cb_err).was_called(1);
+ r1("nope");
+ assert.spy(cb).was_called(0);
+ assert.spy(cb_err).was_called(1);
+ assert.equal("fail", result);
+ end);
+ end);
+ describe("catch()", function ()
+ it("works", function ()
+ local result;
+ local p = promise.new(function (resolve)
+ error({ foo = true });
+ end);
+ local cb1 = spy.new(function (v)
+ result = v;
+ end);
+ assert.spy(cb1).was_called(0);
+ p:catch(cb1);
+ assert.spy(cb1).was_called(1);
+ assert.same({ foo = true }, result);
+ end);
+ end);
+ it("promises may be resolved by other promises", function ()
+ local r1, r2;
+ local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
+
+ local result;
+ local cb = spy.new(function (v)
+ result = v;
+ end);
+ p1:next(cb);
+ assert.spy(cb).was_called(0);
+
+ r1(p2);
+ assert.spy(cb).was_called(0);
+ r2("yep");
+ assert.spy(cb).was_called(1);
+ assert.equal("yep", result);
+ end);
+ describe("reject()", function ()
+ it("returns a rejected promise", function ()
+ local p = promise.reject("foo");
+ local cb = spy.new(function () end);
+ p:catch(cb);
+ assert.spy(cb).was_called(1);
+ assert.spy(cb).was_called_with("foo");
+ end);
+ it("returns a rejected promise and does not call on_fulfilled", function ()
+ local p = promise.reject("foo");
+ local cb = spy.new(function () end);
+ p:next(cb);
+ assert.spy(cb).was_called(0);
+ end);
+ end);
+ describe("finally()", function ()
+ local p, p2, resolve, reject, on_finally;
+ before_each(function ()
+ p = promise.new(function (_resolve, _reject)
+ resolve, reject = _resolve, _reject;
+ end);
+ on_finally = spy.new(function () end);
+ p2 = p:finally(on_finally);
+ end);
+ it("runs when a promise is resolved", function ()
+ assert.spy(on_finally).was_called(0);
+ resolve("foo");
+ assert.spy(on_finally).was_called(1);
+ assert.spy(on_finally).was_not_called_with("foo");
+ end);
+ it("runs when a promise is rejected", function ()
+ assert.spy(on_finally).was_called(0);
+ reject("foo");
+ assert.spy(on_finally).was_called(1);
+ assert.spy(on_finally).was_not_called_with("foo");
+ end);
+ it("returns a promise that fulfills with the original value", function ()
+ local cb2 = spy.new(function () end);
+ p2:next(cb2);
+ assert.spy(on_finally).was_called(0);
+ assert.spy(cb2).was_called(0);
+ resolve("foo");
+ assert.spy(on_finally).was_called(1);
+ assert.spy(cb2).was_called(1);
+ assert.spy(on_finally).was_not_called_with("foo");
+ assert.spy(cb2).was_called_with("foo");
+ end);
+ it("returns a promise that rejects with the original error", function ()
+ local on_finally_err = spy.new(function () end);
+ local on_finally_ok = spy.new(function () end);
+ p2:catch(on_finally_err);
+ p2:next(on_finally_ok);
+ assert.spy(on_finally).was_called(0);
+ assert.spy(on_finally_err).was_called(0);
+ reject("foo");
+ assert.spy(on_finally).was_called(1);
+ -- Since the original promise was rejected, the finally promise should also be
+ assert.spy(on_finally_ok).was_called(0);
+ assert.spy(on_finally_err).was_called(1);
+ assert.spy(on_finally).was_not_called_with("foo");
+ assert.spy(on_finally_err).was_called_with("foo");
+ end);
+ it("returns a promise that rejects with an uncaught error inside on_finally", function ()
+ p = promise.new(function (_resolve, _reject)
+ resolve, reject = _resolve, _reject;
+ end);
+ local test_error = {};
+ on_finally = spy.new(function () error(test_error) end);
+ p2 = p:finally(on_finally);
+
+ local on_finally_err = spy.new(function () end);
+ p2:catch(on_finally_err);
+ assert.spy(on_finally).was_called(0);
+ assert.spy(on_finally_err).was_called(0);
+ reject("foo");
+ assert.spy(on_finally).was_called(1);
+ assert.spy(on_finally_err).was_called(1);
+ assert.spy(on_finally).was_not_called_with("foo");
+ assert.spy(on_finally).was_not_called_with(test_error);
+ 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);
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