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util.promise: Add some missing test cases (found through mutation testing)

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Matthew Wild 2022-10-07 17:56:38 +01:00
parent a79238fb37
commit e8080773d6
1 changed files with 25 additions and 0 deletions
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25
spec/util_promise_spec.lua
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@ -7,6 +7,11 @@ describe("util.promise", function ()
assert(promise.new());
end);
end);
it("supplies a sensible tostring()", function ()
local s = tostring(promise.new());
assert.truthy(s:find("promise", 1, true));
assert.truthy(s:find("pending", 1, true));
end);
it("notifies immediately for fulfilled promises", function ()
local p = promise.new(function (resolve)
resolve("foo");
@ -459,6 +464,26 @@ describe("util.promise", function ()
{ status = "rejected", reason = "this fails" };
}, result);
end);
it("works when all promises reject", function ()
local r1, r2;
local p1, p2 = promise.new(function (_, reject) r1 = reject end), promise.new(function (_, reject) r2 = reject end);
local p = promise.all_settled({ p1, p2 });
local result;
local cb = spy.new(function (v)
result = v;
end);
p:next(cb);
assert.spy(cb).was_called(0);
r2("this fails");
assert.spy(cb).was_called(0);
r1("this fails too");
assert.spy(cb).was_called(1);
assert.same({
{ status = "rejected", value = "this fails too" };
{ status = "rejected", reason = "this fails" };
}, result);
end);
it("works with non-numeric keys", function ()
local r1, r2;
local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);