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spec/util_promise_spec.lua @ 9485:c667887d78ad
util.serialization: Simpler metatable pre-processing
It was too difficult to describe what it did.
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 12 Oct 2018 00:13:24 +0200 |
parent | 9457:d01cff2f7a26 |
child | 9510:8ef46d09386a |
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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); 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:next(cb); assert.spy(cb).was_called(1); assert.spy(cb).was_called_with("foo"); end); end); end);