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