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util.promise: Add join() convenience method

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Usage: promise.join(p1, p2, function (result1, result2)
  [...]
end)
This commit is contained in:
Matthew Wild 2021-03-25 14:28:38 +00:00
parent 3952fae8ce
commit 2141d9d94a
2 changed files with 37 additions and 0 deletions
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26
spec/util_promise_spec.lua
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@ -459,6 +459,32 @@ describe("util.promise", function ()
assert.same({ foo = true }, result);
end);
end);
describe("join()", function ()
it("works", function ()
local r1, r2;
local res1, res2;
local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
local p = promise.join(p1, p2, function (_res1, _res2)
res1, res2 = _res1, _res2;
return promise.resolve("works");
end);
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("works", result);
assert.equals("nope", res1);
assert.equals("yep", res2);
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);