From b87d2fdfec9eb9dcb1f17a9dced133151ff70e84 Mon Sep 17 00:00:00 2001
From: Andrej Babic <andrej.babic@psi.ch>
Date: Wed, 29 Apr 2020 11:32:20 +0200
Subject: [PATCH] Add test for a full queue

---
 core-buffer/test/test_FastQueue.cpp | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/core-buffer/test/test_FastQueue.cpp b/core-buffer/test/test_FastQueue.cpp
index 6dab0c4..74b3ecb 100644
--- a/core-buffer/test/test_FastQueue.cpp
+++ b/core-buffer/test/test_FastQueue.cpp
@@ -45,5 +45,27 @@ TEST(FastQueue, basic_interaction)
 
 TEST(FastQueue, queue_full)
 {
+    size_t n_slots = 5;
+    size_t slot_data_n_bytes = MODULE_N_BYTES * 2;
+    FastQueue<DetectorFrame> queue(slot_data_n_bytes, n_slots);
 
+    // There is nothing to be read in the queue.
+    ASSERT_EQ(queue.read(), -1);
+
+    for (size_t i=0; i<n_slots; i++) {
+        // Business as usual here, we still have slots left.
+        ASSERT_NE(queue.reserve(), -1);
+        queue.commit();
+    }
+
+    // There are no more slots available.
+    ASSERT_EQ(queue.reserve(), -1);
+    // We now read the first slot.
+    ASSERT_EQ(queue.read(), 0);
+    // But until we release it we cannot re-use it.
+    ASSERT_EQ(queue.reserve(), -1);
+
+    queue.release();
+    // After the release, the first slot is again ready for writing.
+    ASSERT_EQ(queue.reserve(), 0);
 }
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