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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/sensor.hpp>
#include <lager/state.hpp>
#include "spies.hpp"
using namespace lager;
struct counter
{
std::size_t count = 0;
std::size_t operator()() { return count++; }
};
TEST_CASE("sensor, basic")
{
auto x = make_sensor([] { return 42; });
auto y = reader<int>{x};
CHECK(42 == x.get());
commit(x);
CHECK(42 == x.get());
CHECK(42 == y.get());
}
TEST_CASE("sensor, looks up only on commit")
{
auto x = make_sensor(counter{});
CHECK(0 == x.get());
CHECK(0 == x.get());
commit(x);
CHECK(1 == x.get());
CHECK(1 == x.get());
commit(x);
CHECK(2 == x.get());
}
TEST_CASE("sensor, watching")
{
auto expected = std::size_t{1};
auto x = make_sensor(counter{});
auto s = testing::spy([&](std::size_t curr) { CHECK(expected == curr); });
watch(x, s);
CHECK(0 == s.count());
commit(x);
CHECK(1 == s.count());
++expected;
commit(x);
CHECK(2 == s.count());
}
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