Software /
code /
prosody
File
spec/util_promise_spec.lua @ 9609:1dfcea523200 0.11
mod_storage_memory: Support the purge driver method
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Wed, 07 Nov 2018 20:30:21 +0100 |
parent | 9557:d7fdd418adf8 |
child | 10297:da9f21a70e52 |
line wrap: on
line source
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);