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// Copyright 2021 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/core/lib/promise/seq.h"
#include <gtest/gtest.h>
namespace grpc_core {
TEST(PromiseTest, Immediate) {
EXPECT_EQ(Seq([] { return 3; })(), 3);
}
TEST(PromiseTest, OneThen) {
auto initial = [] { return 3; };
auto then = [](int i) { return [i]() { return i + 4; }; };
EXPECT_EQ(Seq(initial, then)(), Poll<int>(7));
}
TEST(PromiseTest, TwoTypedThens) {
struct A {};
struct B {};
struct C {};
auto initial = [] { return A{}; };
auto next1 = [](A) { return []() { return B{}; }; };
auto next2 = [](B) { return []() { return C{}; }; };
EXPECT_FALSE(absl::holds_alternative<Pending>(Seq(initial, next1, next2)()));
}
/* This does not compile, but is useful for testing error messages generated
TEST(PromiseTest, MisTypedThen) {
struct A {};
struct B {};
auto initial = [] { return A{}; };
auto next = [](B) { return []() { return B{}; }; };
Seq(initial, next)().take();
}
*/
TEST(PromiseTest, TwoThens) {
auto initial = [] { return std::string("a"); };
auto next1 = [](std::string i) { return [i]() { return i + "b"; }; };
auto next2 = [](std::string i) { return [i]() { return i + "c"; }; };
EXPECT_EQ(Seq(initial, next1, next2)(), Poll<std::string>("abc"));
}
TEST(PromiseTest, ThreeThens) {
EXPECT_EQ(Seq([] { return std::string("a"); },
[](std::string i) { return [i]() { return i + "b"; }; },
[](std::string i) { return [i]() { return i + "c"; }; },
[](std::string i) { return [i]() { return i + "d"; }; })(),
Poll<std::string>("abcd"));
}
struct Big {
int x[256];
void YesItIsUnused() const {}
};
TEST(PromiseTest, SaneSizes) {
auto x = Big();
auto p1 = Seq(
[x] {
x.YesItIsUnused();
return 1;
},
[](int) {
auto y = Big();
return [y]() {
y.YesItIsUnused();
return 2;
};
});
EXPECT_GE(sizeof(p1), sizeof(Big));
EXPECT_LT(sizeof(p1), 2 * sizeof(Big));
}
} // namespace grpc_core
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}