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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/manual.hpp>
#include <lager/store.hpp>
#include "../example/counter/counter.hpp"
#include <optional>
TEST_CASE("automatic")
{
auto viewed = std::optional<counter::model>{std::nullopt};
auto view = [&](auto model) { viewed = model; };
auto store = lager::make_store<counter::action>(
counter::model{}, lager::with_manual_event_loop{});
watch(store, [&](auto&& v) { view(v); });
CHECK(!viewed);
CHECK(store.get().value == 0);
store.dispatch(counter::increment_action{});
CHECK(viewed);
CHECK(viewed->value == 1);
CHECK(store.get().value == 1);
}
TEST_CASE("basic")
{
auto viewed = std::optional<counter::model>{std::nullopt};
auto view = [&](auto model) { viewed = model; };
auto store = lager::make_store<counter::action, lager::transactional_tag>(
counter::model{}, lager::with_manual_event_loop{});
watch(store, [&](auto&& v) { view(v); });
CHECK(!viewed);
CHECK(store.get().value == 0);
store.dispatch(counter::increment_action{});
CHECK(!viewed);
CHECK(store.get().value == 0);
lager::commit(store);
CHECK(viewed);
CHECK(viewed->value == 1);
CHECK(store.get().value == 1);
}
TEST_CASE("with reducer enhancer")
{
auto reducer = [](counter::model m, counter::action) { return m; };
auto store =
lager::make_store<counter::action>(counter::model{},
lager::with_manual_event_loop{},
lager::with_reducer(reducer));
CHECK(store.get().value == 0);
store.dispatch(counter::increment_action{});
CHECK(store.get().value == 0);
}
TEST_CASE("effect as a result")
{
auto viewed = std::optional<int>{std::nullopt};
auto view = [&](auto model) { viewed = model; };
auto called = 0;
auto effect = [&](lager::context<int> ctx) { ++called; };
auto store =
lager::make_store<int>(0,
lager::with_manual_event_loop{},
lager::with_reducer([=](int model, int action) {
return std::pair{model + action, effect};
}));
watch(store, [&](auto&& v) { view(v); });
store.dispatch(2);
CHECK(viewed);
CHECK(*viewed == 2);
CHECK(called == 1);
}
TEST_CASE("effects see updated world")
{
auto called = 0;
auto store = std::optional<lager::store<int, int>>{};
auto effect = [&](lager::context<int> ctx) {
CHECK(store->get() == 2);
++called;
};
store =
lager::make_store<int>(0,
lager::with_manual_event_loop{},
lager::with_reducer([=](int model, int action) {
return std::pair{model + action, effect};
}));
store->dispatch(2);
CHECK(called == 1);
CHECK(store->get() == 2);
}
TEST_CASE("store type erasure")
{
auto viewed = std::optional<counter::model>{std::nullopt};
auto view = [&](auto model) { viewed = model; };
lager::store<counter::action, counter::model> store =
lager::make_store<counter::action>(counter::model{},
lager::with_manual_event_loop{});
watch(store, [&](auto&& v) { view(v); });
CHECK(!viewed);
store.dispatch(counter::increment_action{});
CHECK(viewed);
CHECK(viewed->value == 1);
}
namespace services {
struct foo
{
int x = 0;
};
struct params
{
const char* host = "bar";
};
} // namespace services
TEST_CASE("with deps enhancer")
{
auto f = services::foo{};
auto store = lager::make_store<counter::action>(
counter::model{},
lager::with_manual_event_loop{},
lager::with_deps(std::ref(f), services::params{"yeah"}));
f.x = 42;
CHECK(lager::get<services::foo>(store).x == 42);
CHECK(lager::get<services::params>(store).host == std::string{"yeah"});
}
TEST_CASE("with deps, type erased, plus effects")
{
auto called1 = 0;
auto called2 = 0;
auto called3 = 0;
auto effect1 =
[&](lager::context<counter::action, lager::deps<services::foo&>> ctx) {
CHECK(ctx.get<services::foo>().x == 42);
++called1;
};
auto effect2 = [&](lager::context<counter::action,
lager::deps<services::params>> ctx) {
CHECK(ctx.get<services::params>().host == std::string{"yeah"});
++called2;
};
auto effect3 = [&](auto ctx) {
CHECK(lager::get<services::foo>(ctx).x == 42);
CHECK(lager::get<services::params>(ctx).host == std::string{"yeah"});
++called3;
};
auto f = services::foo{};
lager::store<counter::action, counter::model> store =
lager::make_store<counter::action>(
counter::model{},
lager::with_manual_event_loop{},
lager::with_deps(std::ref(f), services::params{"yeah"}),
lager::with_reducer([&](auto m, auto act) {
return std::make_pair(counter::update(m, act), [&](auto ctx) {
effect1(ctx);
effect2(ctx);
effect3(ctx);
});
}));
f.x = 42;
store.dispatch(counter::increment_action{});
CHECK(called1 == 1);
CHECK(called2 == 1);
CHECK(called3 == 1);
}
TEST_CASE("sequencing multiple effects with deps")
{
auto called1 = 0;
auto called2 = 0;
auto called3 = 0;
auto effect1 = lager::effect<counter::action, lager::deps<services::foo&>>{
[&](lager::context<counter::action, lager::deps<services::foo&>> ctx) {
CHECK(ctx.get<services::foo>().x == 42);
++called1;
}};
auto effect2 =
lager::effect<counter::action, lager::deps<services::params>>{
[&](lager::context<counter::action, lager::deps<services::params>>
ctx) {
CHECK(ctx.get<services::params>().host == std::string{"yeah"});
++called2;
}};
auto effect3 = lager::effect<counter::action,
lager::deps<services::foo&, services::params>>{
[&](auto ctx) {
CHECK(lager::get<services::foo>(ctx).x == 42);
CHECK(lager::get<services::params>(ctx).host ==
std::string{"yeah"});
++called3;
}};
auto f = services::foo{};
auto store = lager::make_store<counter::action>(
counter::model{},
lager::with_manual_event_loop{},
lager::with_deps(std::ref(f), services::params{"yeah"}),
lager::with_reducer([&](auto m, auto act) {
return std::make_pair(counter::update(m, act),
lager::sequence(effect1, effect2, effect3));
}));
f.x = 42;
store.dispatch(counter::increment_action{});
CHECK(called1 == 1);
CHECK(called2 == 1);
CHECK(called3 == 1);
}
namespace {
struct child1_action
{};
struct child2_action
{};
struct child3_action
{};
using parent_action = std::variant<child1_action, child2_action, child3_action>;
} // namespace
TEST_CASE("sequencing hierarchical actions")
{
auto eff1called = 0;
auto eff2called = 0;
auto eff1 = lager::effect<child1_action>{[&](auto&&) { ++eff1called; }};
auto eff2 = lager::effect<child2_action>{[&](auto&&) { ++eff2called; }};
auto eff3 = lager::effect<parent_action>{lager::sequence(eff1, eff2)};
eff3(lager::context<parent_action>{});
CHECK(eff1called == 1);
CHECK(eff2called == 1);
}
TEST_CASE("subsetting context actions")
{
auto eff1 = lager::effect<lager::actions<child1_action, child3_action>>{
[](auto&& ctx) {
ctx.dispatch(child1_action{});
ctx.dispatch(child3_action{});
}};
auto eff2 = lager::effect<
lager::actions<child1_action, child2_action, child3_action>>{eff1};
auto eff3 = lager::effect<parent_action>{eff2};
auto dispatch_count = 0;
auto dispatcher = [&](auto) {
++dispatch_count;
return lager::future{};
};
auto loop = lager::with_manual_event_loop{};
auto ctx = lager::context<parent_action>{dispatcher, loop, {}};
eff3(ctx);
CHECK(dispatch_count == 2);
eff2(ctx);
CHECK(dispatch_count == 4);
eff1(ctx);
CHECK(dispatch_count == 6);
}
using parent2_action =
std::variant<std::pair<int, child1_action>, child2_action, child3_action>;
TEST_CASE("composing context with converter")
{
auto store = lager::make_store<parent2_action>(
0,
lager::with_manual_event_loop{},
lager::with_reducer([=](int model, parent2_action action) {
return std::visit(
lager::visitor{
[](std::pair<int, child1_action> p) { return p.first; },
[](auto x) { return 0; }},
action);
}));
auto ctx1 = lager::context<child1_action>{
store, [](auto&& act) { return std::make_pair(1, child1_action{}); }};
auto ctx2 = lager::context<child1_action>{
store, [](auto&& act) { return std::make_pair(2, child1_action{}); }};
ctx1.dispatch(child1_action{});
CHECK(*store == 1);
ctx2.dispatch(child1_action{});
CHECK(*store == 2);
}
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