Added some mpmc_q tests

tests/CMakeLists.txt

@@ -14,7 +14,7 @@ set(SPDLOG_UTESTS_SOURCES
     test_macros.cpp
     utils.cpp
     utils.h
-    main.cpp)
+    main.cpp test_mpmc_q.cpp)
 
 add_executable(${PROJECT_NAME} ${SPDLOG_UTESTS_SOURCES})
 target_link_libraries(${PROJECT_NAME} PRIVATE Threads::Threads)

tests/test_mpmc_q.cpp

+#include "includes.h"
+
+using namespace std::chrono;
+using std::chrono::system_clock;
+using std::chrono::milliseconds;
+
+system_clock::time_point now_millis()
+{
+    return time_point_cast<milliseconds>(system_clock::now());
+}
+TEST_CASE("dequeue-empty-nowait", "[mpmc_blocking_q]")
+{
+    size_t q_size = 100;
+    milliseconds tolerance_wait(10);
+    spdlog::details::mpmc_blocking_queue<int> q(q_size);
+    int popped_item;
+
+    auto millis_0 = now_millis();
+    auto rv = q.dequeue_for(popped_item, milliseconds::zero());
+    auto millis_1 = now_millis();
+
+    REQUIRE(rv == false);
+    REQUIRE((millis_1-millis_0) <= tolerance_wait);
+
+}
+
+TEST_CASE("dequeue-empty-wait", "[mpmc_blocking_q]")
+{
+
+    size_t q_size = 100;
+    milliseconds wait_ms(250);
+    milliseconds tolerance_wait(10);
+
+    spdlog::details::mpmc_blocking_queue<int> q(q_size);
+    int popped_item;
+    auto millis_0 = now_millis();
+    auto rv = q.dequeue_for(popped_item, wait_ms);
+    auto millis_1 = now_millis();
+    auto delta_ms = millis_1 - millis_0;
+
+    REQUIRE(rv == false);
+    REQUIRE(delta_ms >= wait_ms);
+    REQUIRE(delta_ms <= wait_ms + tolerance_wait);
+}
+
+
+TEST_CASE("enqueue_nowait", "[mpmc_blocking_q]")
+{
+
+    size_t q_size = 1;
+    spdlog::details::mpmc_blocking_queue<int> q(q_size);
+    milliseconds tolerance_wait(10);
+
+    q.enqueue(1);
+    REQUIRE(q.overrun_counter() == 0);
+
+    auto millis_0 = now_millis();
+    q.enqueue_nowait(2);
+    auto millis_1 = now_millis();
+    REQUIRE((millis_1-millis_0) <= tolerance_wait);
+    REQUIRE(q.overrun_counter() == 1);
+}
+
+TEST_CASE("bad_queue", "[mpmc_blocking_q]")
+{
+    size_t q_size = 0;
+    spdlog::details::mpmc_blocking_queue<int> q(q_size);
+    q.enqueue_nowait(1);
+    REQUIRE(q.overrun_counter() == 1);
+    int i;
+    REQUIRE(q.dequeue_for(i, milliseconds(0)) == false);
+}
+
+TEST_CASE("empty_queue", "[mpmc_blocking_q]")
+{
+    size_t q_size = 10;
+    spdlog::details::mpmc_blocking_queue<int> q(q_size);
+    int i;
+    REQUIRE(q.dequeue_for(i, milliseconds(10)) == false);
+}
+
+TEST_CASE("full_queue", "[mpmc_blocking_q]")
+{
+    size_t q_size = 100;
+    spdlog::details::mpmc_blocking_queue<int> q(q_size);
+    for(int i = 0; i < static_cast<int>(q_size); i++)
+    {
+        q.enqueue(std::move(i));
+    }
+
+    q.enqueue_nowait(123456);
+    REQUIRE(q.overrun_counter() == 1);
+
+    for(int i = 1; i < static_cast<int>(q_size); i++)
+    {
+        int item;
+        q.dequeue_for(item, milliseconds(0));
+        REQUIRE(item == i);
+    }
+    
+    // last item pushed has overridden the oldest.
+    int item;
+    q.dequeue_for(item, milliseconds(0));
+    REQUIRE(item == 123456);
+}
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