async_context/tests/basics.test.cpp at a4baff8ff5fc8ccfbf36a2ef0c4458419061b318 · libhal/async_context · GitHub

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#include <coroutine>

#include <boost/ut.hpp>
#include <print>
#include <variant>

import async_context;
import test_utils;

void basics()
{
  using namespace boost::ut;

  "sync return type void"_test = []() {
    // Setup
    async::inplace_context<1024> ctx;

    unsigned step = 0;
    auto sync_coroutine = [&step](async::context&) -> async::future<void> {
      step = 1;
      return {};
    };

    // Exercise
    auto future = sync_coroutine(ctx);

    // Verify
    expect(that % 0 == ctx.memory_used());
    expect(that % future.done());
    expect(that % future.has_value());
    expect(that % 1 == step);
  };

  "sync return type int"_test = []() {
    // Setup
    async::inplace_context<1024> ctx;

    static constexpr int expected_return_value = 5;

    unsigned step = 0;
    auto sync_coroutine = [&step](async::context&) -> async::future<int> {
      step = 1;
      return expected_return_value;
    };

    // Exercise
    auto future = sync_coroutine(ctx);

    // Verify
    expect(that % 0 == ctx.memory_used());
    expect(that % future.done());
    expect(that % future.has_value());
    expect(that % expected_return_value == future.value());
    expect(that % 1 == step);
  };

  "sync return type std::string"_test = []() {
    // Setup
    async::inplace_context<1024> ctx;

    static constexpr auto expected_return_value = "Hello, World\n";

    unsigned step = 0;
    auto sync_coroutine =
      [&step](async::context&) -> async::future<std::string> {
      step = 1;
      return expected_return_value;
    };

    // Exercise
    auto future = sync_coroutine(ctx);

    // Verify
    expect(that % 0 == ctx.memory_used());
    expect(that % future.done());
    expect(that % future.has_value());
    expect(that % expected_return_value == future.value());
    expect(that % 1 == step);
  };

  "co_return"_test = []() {
    // Setup
    async::inplace_context<1024> ctx;

    static constexpr int expected_return_value = 5;
    unsigned step = 0;
    auto async_coroutine = [&step](async::context&) -> async::future<int> {
      step = 1;
      co_return expected_return_value;
    };

    // Exercise 1
    auto future = async_coroutine(ctx);

    // Verify 1
    expect(that % 0 < ctx.memory_used());
    expect(that % not future.done());
    expect(that % not future.has_value());
    expect(that % 0 == step);

    // Exercise 2: start and finish coroutine
    future.resume();

    // Verify 2
    expect(that % 0 == ctx.memory_used());
    expect(that % future.done());
    expect(that % future.has_value());
    expect(that % expected_return_value == future.value());
    expect(that % 1 == step);
  };

  "suspend then co_return"_test = []() {
    // Setup
    async::inplace_context<1024> ctx;

    static constexpr int expected_return_value = 1413;
    unsigned step = 0;
    auto async_coroutine = [&step](async::context&) -> async::future<int> {
      step = 1;
      co_await std::suspend_always{};
      step = 2;
      co_return expected_return_value;
    };

    // Exercise 1
    auto future = async_coroutine(ctx);

    // Verify 1
    expect(that % 0 < ctx.memory_used());
    expect(that % not future.done());
    expect(that % not future.has_value());
    expect(that % 0 == step);

    // Exercise 2: start and suspend coroutine
    future.resume();

    // Verify 2
    expect(that % 0 < ctx.memory_used());
    expect(that % not future.done());
    expect(that % not future.has_value());
    expect(that % 1 == step);

    // Exercise 3: resume and co_return from coroutine
    future.resume();

    // Verify 3
    expect(that % 0 == ctx.memory_used());
    expect(that % future.done());
    expect(that % future.has_value());
    expect(that % expected_return_value == future.value());
    expect(that % 2 == step);
  };

  "co_await coroutine"_test = []() {
    // Setup
    async::inplace_context<1024> ctx;

    static constexpr int expected_return_value = 1413;
    unsigned step = 0;
    auto co2 = [&step](async::context&) -> async::future<int> {
      step = 2;
      co_await std::suspend_always{};
      // skipped as the co1 will immediately resume
      step = 3;
      co_return expected_return_value;
    };
    auto co = [&step, &co2](async::context& p_ctx) -> async::future<int> {
      step = 1;  // skipped as the co2 will immediately start
      auto const val = co_await co2(p_ctx);
      step = 4;
      co_return val;
    };

    // Exercise 1
    auto future = co(ctx);

    // Verify 1
    expect(that % 0 < ctx.memory_used());
    expect(that % not future.done());
    expect(that % not future.has_value());
    expect(that % 0 == step);

    // Exercise 2: start, enter co_2, start immediately and suspend
    future.resume();

    // Verify 2
    expect(that % 0 < ctx.memory_used());
    expect(that % not future.done());
    expect(that % not future.has_value());
    expect(that % 2 == step);

    // Exercise 3: resume, co_2 co_returns, immediately resumes parent, return
    future.resume();

    // Verify 3
    expect(that % 0 == ctx.memory_used());
    expect(that % future.done());
    expect(that % future.has_value());
    expect(that % expected_return_value == future.value());
    expect(that % 4 == step);
  };

  "co_await coroutine sync"_test = []() {
    // Setup
    async::inplace_context<1024> ctx;

    static constexpr int return_value1 = 1413;
    static constexpr int return_value2 = 4324;
    static constexpr int expected_total = return_value1 + return_value2;

    unsigned step = 0;
    auto co2 = [](async::context&) -> async::future<int> {
      return return_value1;
    };

    auto co = [&step, &co2](async::context& p_ctx) -> async::future<int> {
      step = 1;  // skipped as the co2 will immediately start
      auto val = co_await co2(p_ctx);
      step = 2;
      co_return val + return_value2;
    };

    // Exercise 1
    auto future = co(ctx);

    // Verify 1
    expect(that % 0 < ctx.memory_used());
    expect(that % not future.done());
    expect(that % not future.has_value());
    expect(that % 0 == step);

    // Exercise 2: start, call co_2, returns value immediately and co_returns
    future.resume();

    // Verify 3
    expect(that % 0 == ctx.memory_used());
    expect(that % future.done());
    expect(that % future.has_value());
    expect(that % expected_total == future.value());
    expect(that % 2 == step);
  };
};

int main()
{
  basics();
}