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|
#include "../test.h"
#include <rxcpp/operators/rx-any.hpp>
// NOTE: `exists` is an alias of `any`
SCENARIO("exists emits true if an item satisfies the given condition", "[exists][operators]"){
GIVEN("a source") {
auto sc = rxsc::make_test();
auto w = sc.create_worker();
const rxsc::test::messages<int> on;
const rxsc::test::messages<bool> on_exists;
auto xs = sc.make_hot_observable({
on.next(150, 1),
on.next(210, 2),
on.completed(250)
});
WHEN("invoked with a predicate"){
auto res = w.start(
[xs]() {
return xs
| rxo::exists([](int n) { return n == 2; })
| rxo::as_dynamic(); // forget type to workaround lambda deduction bug on msvc 2013
}
);
THEN("the output only contains true"){
auto required = rxu::to_vector({
on_exists.next(210, true),
on_exists.completed(210)
});
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, 210)
});
auto actual = xs.subscriptions();
REQUIRE(required == actual);
}
}
}
}
SCENARIO("exists emits false if no item satisfies the given condition", "[exists][operators]"){
GIVEN("a source") {
auto sc = rxsc::make_test();
auto w = sc.create_worker();
const rxsc::test::messages<int> on;
const rxsc::test::messages<bool> on_exists;
auto xs = sc.make_hot_observable({
on.next(150, 1),
on.next(210, 2),
on.completed(250)
});
WHEN("invoked with a predicate"){
auto res = w.start(
[xs]() {
return xs
.exists([](int n) { return n > 2; })
.as_dynamic(); // forget type to workaround lambda deduction bug on msvc 2013
}
);
THEN("the output only contains true"){
auto required = rxu::to_vector({
on_exists.next(250, false),
on_exists.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("exists emits false if the source observable is empty", "[exists][operators]"){
GIVEN("a source") {
auto sc = rxsc::make_test();
auto w = sc.create_worker();
const rxsc::test::messages<int> on;
const rxsc::test::messages<bool> on_exists;
auto xs = sc.make_hot_observable({
on.completed(250)
});
WHEN("invoked with a predicate"){
auto res = w.start(
[xs]() {
return xs
.exists([](int n) { return n == 2; })
.as_dynamic(); // forget type to workaround lambda deduction bug on msvc 2013
}
);
THEN("the output only contains true"){
auto required = rxu::to_vector({
on_exists.next(250, false),
on_exists.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("exists never emits if the source observable never emits any items", "[exists][operators]"){
GIVEN("a source"){
auto sc = rxsc::make_test();
auto w = sc.create_worker();
const rxsc::test::messages<int> on;
const rxsc::test::messages<bool> on_exists;
auto xs = sc.make_hot_observable({
on.next(150, 1)
});
WHEN("invoked with a predicate"){
auto res = w.start(
[xs]() {
return xs
.exists([](int n) { return n == 2; })
.as_dynamic(); // forget type to workaround lambda deduction bug on msvc 2013
}
);
THEN("the output is empty"){
auto required = std::vector<rxsc::test::messages<bool>::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("exists emits an error", "[exists][operators]"){
GIVEN("a source"){
auto sc = rxsc::make_test();
auto w = sc.create_worker();
const rxsc::test::messages<int> on;
const rxsc::test::messages<bool> on_exists;
std::runtime_error ex("exists on_error from source");
auto xs = sc.make_hot_observable({
on.next(150, 1),
on.error(250, ex)
});
WHEN("invoked with a predicate"){
auto res = w.start(
[xs]() {
return xs
.exists([](int n) { return n == 2; })
.as_dynamic(); // forget type to workaround lambda deduction bug on msvc 2013
}
);
THEN("the output only contains only error"){
auto required = rxu::to_vector({
on_exists.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);
}
}
}
}
|
