test/operators/map.cpp

#include "../test.h"
#include <rxcpp/operators/rx-map.hpp>

SCENARIO("map stops on completion", "[map][operators]") {
    GIVEN("a test hot observable of ints") {
        auto sc = rxsc::make_test();
        auto w = sc.create_worker();
        const rxsc::test::messages<int> on;
        long invoked = 0;

        auto xs = sc.make_hot_observable({
            on.next(180, 1),
            on.next(210, 2),
            on.next(240, 3),
            on.next(290, 4),
            on.next(350, 5),
            on.completed(400),
            on.next(410, -1),
            on.completed(420),
            on.error(430, std::runtime_error("error on unsubscribed stream"))
        });

        WHEN("mapped to ints that are one larger") {

            auto res = w.start(
                [xs, &invoked]() {
                    return xs
                        .map([&invoked](int x) {
                            invoked++;
                            return x + 1;
                        })
                        // forget type to workaround lambda deduction bug on msvc 2013
                        .as_dynamic();
                }
            );

            THEN("the output stops on completion") {
                auto required = rxu::to_vector({
                    on.next(210, 3),
                    on.next(240, 4),
                    on.next(290, 5),
                    on.next(350, 6),
                    on.completed(400)
                });
                auto actual = res.get_observer().messages();
                REQUIRE(required == actual);
            }

            THEN("there was one subscription and one unsubscription") {
                auto required = rxu::to_vector({
                    on.subscribe(200, 400)
                });
                auto actual = xs.subscriptions();
                REQUIRE(required == actual);
            }

            THEN("map was called until completed") {
                REQUIRE(4 == invoked);
            }
        }
    }
}

SCENARIO("map - never", "[map][operators]") {
    GIVEN("a source") {
        auto sc = rxsc::make_test();
        auto w = sc.create_worker();
        const rxsc::test::messages<int> on;

        auto xs = sc.make_hot_observable({
            on.next(150, 1)
        });

        WHEN("values are mapped") {

            auto res = w.start(
                [xs]() {
                    return xs
                        | rxo::map([](int x) {
                            return x + 1;
                        })
                        // forget type to workaround lambda deduction bug on msvc 2013
                        | rxo::as_dynamic();
                }
            );

            THEN("the output is empty") {
                auto required = std::vector<rxsc::test::messages<int>::recorded_type>();
                auto actual = res.get_observer().messages();
                REQUIRE(required == actual);
            }

            THEN("there was 1 subscription/unsubscription to the source") {
                auto required = rxu::to_vector({
                    on.subscribe(200, 1000)
                });
                auto actual = xs.subscriptions();
                REQUIRE(required == actual);
            }
        }
    }
}

SCENARIO("map - empty", "[map][operators]") {
    GIVEN("a source") {
        auto sc = rxsc::make_test();
        auto w = sc.create_worker();
        const rxsc::test::messages<int> on;

        auto xs = sc.make_hot_observable({
            on.next(150, 1),
            on.completed(250)
        });

        WHEN("values are mapped") {

            auto res = w.start(
                [xs]() {
                    return xs
                        .map([](int x) {
                            return x + 1;
                        })
                        // forget type to workaround lambda deduction bug on msvc 2013
                        .as_dynamic();
                }
            );

            THEN("the output only contains complete message") {
                auto required = rxu::to_vector({
                    on.completed(250)
                });
                auto actual = res.get_observer().messages();
                REQUIRE(required == actual);
            }

            THEN("there was 1 subscription/unsubscription to the source") {
                auto required = rxu::to_vector({
                    on.subscribe(200, 250)
                });
                auto actual = xs.subscriptions();
                REQUIRE(required == actual);
            }

        }
    }
}

SCENARIO("map - items emitted", "[map][operators]") {
    GIVEN("a source") {
        auto sc = rxsc::make_test();
        auto w = sc.create_worker();
        const rxsc::test::messages<int> on;

        auto xs = sc.make_hot_observable({
            on.next(150, 1),
            on.next(210, 2),
            on.next(240, 3),
            on.completed(300)
        });

        WHEN("values are mapped") {

            auto res = w.start(
                [xs]() {
                    return xs
                        .map([](int x) {
                            return x + 1;
                        })
                        // forget type to workaround lambda deduction bug on msvc 2013
                        .as_dynamic();
                }
            );

            THEN("the output only contains items sent while subscribed") {
                auto required = rxu::to_vector({
                    on.next(210, 3),
                    on.next(240, 4),
                    on.completed(300)
                });
                auto actual = res.get_observer().messages();
                REQUIRE(required == actual);
            }

            THEN("there was 1 subscription/unsubscription to the source") {
                auto required = rxu::to_vector({
                    on.subscribe(200, 300)
                });
                auto actual = xs.subscriptions();
                REQUIRE(required == actual);
            }

        }
    }
}

SCENARIO("map - throw", "[map][operators]") {
    GIVEN("a source") {
        auto sc = rxsc::make_test();
        auto w = sc.create_worker();
        const rxsc::test::messages<int> on;

        std::runtime_error ex("map on_error from source");

        auto xs = sc.make_hot_observable({
            on.next(150, 1),
            on.error(250, ex)
        });

        WHEN("values are mapped") {

            auto res = w.start(
                [xs]() {
                    return xs
                        .map([](int x) {
                            return x + 1;
                        })
                        // forget type to workaround lambda deduction bug on msvc 2013
                        .as_dynamic();
                }
            );

            THEN("the output only contains only error") {
                auto required = rxu::to_vector({
                    on.error(250, ex)
                });
                auto actual = res.get_observer().messages();
                REQUIRE(required == actual);
            }

            THEN("there was 1 subscription/unsubscription to the source") {
                auto required = rxu::to_vector({
                    on.subscribe(200, 250)
                });
                auto actual = xs.subscriptions();
                REQUIRE(required == actual);
            }

        }
    }
}