Added basic interaction test for fast queue

core-buffer/test/test_FastQueue.cpp

@@ -0,0 +1,45 @@
+#include "FastQueue.hpp"
+#include "gtest/gtest.h"
+
+using namespace core_buffer;
+
+TEST(FastQueue, basic_interaction)
+{
+
+    size_t n_slots = 5;
+    size_t slot_data_n_bytes = MODULE_N_BYTES * 2;
+    FastQueue<DetectorFrame> queue(slot_data_n_bytes, n_slots);
+    int slot_id;
+
+    // The queue at the beginning should be empty.
+    ASSERT_EQ(queue.read(), -1);
+    // Cannot commit a slot until you reserve it.
+    ASSERT_THROW(queue.commit(), runtime_error);
+    // Cannot release a slot until its ready.
+    ASSERT_THROW(queue.release(), runtime_error);
+
+    // Reserve a slot.
+    slot_id = queue.reserve();
+    ASSERT_NE(slot_id, -1);
+    // But you cannot reserve 2 slots at once.
+    ASSERT_EQ(queue.reserve(), -1);
+    // And cannot read this slot until its committed.
+    ASSERT_EQ(queue.read(), -1);
+
+    auto detector_frame = queue.get_metadata_buffer(slot_id);
+    char* meta_ptr = (char*) detector_frame;
+    char* data_ptr = (char*) queue.get_data_buffer(slot_id);
+
+    queue.commit();
+
+    slot_id = queue.read();
+    // Once the slot is committed we should be able to read it.
+    ASSERT_NE(slot_id, -1);
+    // But you cannot read the next slot until you release the current.
+    ASSERT_EQ(queue.read(), -1);
+    // The 2 buffers should match the committed slot.
+    ASSERT_EQ(meta_ptr, (char*)(queue.get_metadata_buffer(slot_id)));
+    ASSERT_EQ(data_ptr, (char*)(queue.get_data_buffer(slot_id)));
+
+    queue.release();
+}