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//
// lager - library for functional interactive c++ programs
// Copyright (C) 2017 Juan Pedro Bolivar Puente
//
// This file is part of lager.
//
// lager is free software: you can redistribute it and/or modify
// it under the terms of the MIT License, as detailed in the LICENSE
// file located at the root of this source code distribution,
// or here: <https://github.com/arximboldi/lager/blob/master/LICENSE>
//
#include <catch2/catch.hpp>
#include <lager/event_loop/queue.hpp>
#include <lager/store.hpp>
#include "../example/counter/counter.hpp"
TEST_CASE("future then callback is called after reducer")
{
auto queue = lager::queue_event_loop{};
auto store =
lager::make_store<counter::action>(counter::model{},
lager::with_queue_event_loop{queue},
lager::with_futures);
auto called = 0;
store.dispatch(counter::increment_action{}).then([&] {
CHECK(store->value == 1);
++called;
});
CHECK(called == 0);
queue.step();
CHECK(called == 1);
}
TEST_CASE("future then callback is called after effects")
{
auto effect1 = [&](auto&& ctx) -> lager::future { return ctx.dispatch(1); };
auto effect2 = [&](auto&& ctx) -> lager::future { return ctx.dispatch(2); };
auto queue = lager::queue_event_loop{};
auto store = lager::make_store<int>(
0,
lager::with_queue_event_loop{queue},
lager::with_futures,
lager::with_reducer([&](int s, int a) -> lager::result<int, int> {
if (a == 0)
return {s,
lager::sequence(lager::effect<int>{effect1},
lager::effect<int>{effect2})};
else
return s + a;
}));
auto called = 0;
store.dispatch(0).then([&] {
CHECK(*store == 3);
++called;
});
CHECK(called == 0);
queue.step();
CHECK(called == 1);
}
TEST_CASE("future effect callback chaining")
{
auto effect1 = [&](auto&& ctx) -> lager::future { return ctx.dispatch(1); };
auto effect2 = [&](auto&& ctx) -> lager::future { return ctx.dispatch(2); };
auto queue = lager::queue_event_loop{};
auto store = lager::make_store<int>(
0,
lager::with_queue_event_loop{queue},
lager::with_futures,
lager::with_reducer([&](int s, int a) -> lager::result<int, int> {
if (a == 0)
return {s, effect1};
else if (a == 1)
return {s + a, effect2};
else
return s + a;
}));
auto called = 0;
store.dispatch(0).then([&] {
CHECK(*store == 3);
++called;
});
CHECK(called == 0);
queue.step();
CHECK(called == 1);
}
TEST_CASE("future effect callback chaining and stupid effect")
{
auto effect0 = [&](auto&& ctx) -> void {};
auto effect1 = [&](auto&& ctx) -> lager::future { return ctx.dispatch(1); };
auto effect2 = [&](auto&& ctx) -> lager::future { return ctx.dispatch(2); };
auto queue = lager::queue_event_loop{};
auto store = lager::make_store<int>(
0,
lager::with_queue_event_loop{queue},
lager::with_futures,
lager::with_reducer([&](int s, int a) -> lager::result<int, int> {
if (a == 0)
return {s,
lager::sequence(lager::effect<int>{effect1},
lager::effect<int>{effect0})};
else if (a == 1)
return {s + a, effect2};
else
return s + a;
}));
auto called = 0;
store.dispatch(0).then([&] {
CHECK(*store == 3);
++called;
});
CHECK(called == 0);
queue.step();
CHECK(called == 1);
}
TEST_CASE("combining future")
{
auto queue = lager::queue_event_loop{};
auto store =
lager::make_store<counter::action>(counter::model{},
lager::with_queue_event_loop{queue},
lager::with_futures);
auto called = 0;
store.dispatch(counter::increment_action{})
.also(store.dispatch(counter::increment_action{}))
.then([&] {
CHECK(store->value == 2);
++called;
});
CHECK(called == 0);
queue.step();
CHECK(called == 1);
}
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