1 files changed, 108 insertions, 0 deletions
diff --git a/archive/2025/summer/bsc_karidas/tests/unit/test_Writer.cpp b/archive/2025/summer/bsc_karidas/tests/unit/test_Writer.cpp
new file mode 100644
index 000000000..2b555c87e
--- /dev/null
+++ b/archive/2025/summer/bsc_karidas/tests/unit/test_Writer.cpp
@@ -0,0 +1,108 @@
+#include <gtest/gtest.h>
+#include "Writer.hpp"
+#include "BufferQueue.hpp"
+#include "SegmentedStorage.hpp"
+#include <chrono>
+#include <thread>
+#include <filesystem>
+
+class WriterTest : public ::testing::Test
+{
+protected:
+    void SetUp() override
+    {
+        // Create a temporary directory for testing log segments
+        testDir = "test_logs";
+        std::filesystem::create_directories(testDir);
+        queue = std::make_unique<BufferQueue>(8192, 1);
+        // Create a SegmentedStorage instance with small segment size for testing
+        storage = std::make_shared<SegmentedStorage>(
+            testDir,
+            "test_logsegment",
+            1024 * 1024 // max segment size (e.g., 1 MB for test)
+        );
+    }
+
+    void TearDown() override
+    {
+        if (writer)
+        {
+            writer->stop();
+        }
+        // Cleanup test directory if desired
+        std::filesystem::remove_all(testDir);
+    }
+
+    std::unique_ptr<BufferQueue> queue;
+    std::shared_ptr<SegmentedStorage> storage;
+    std::unique_ptr<Writer> writer;
+    std::string testDir;
+};
+
+// Test that the writer starts and stops correctly
+TEST_F(WriterTest, StartAndStop)
+{
+    writer = std::make_unique<Writer>(*queue, storage);
+    EXPECT_FALSE(writer->isRunning());
+
+    writer->start();
+    EXPECT_TRUE(writer->isRunning());
+
+    writer->stop();
+    EXPECT_FALSE(writer->isRunning());
+}
+
+// Test multiple start calls
+TEST_F(WriterTest, MultipleStartCalls)
+{
+    writer = std::make_unique<Writer>(*queue, storage);
+    writer->start();
+    EXPECT_TRUE(writer->isRunning());
+
+    writer->start(); // multiple start calls should not affect the running state
+    EXPECT_TRUE(writer->isRunning());
+
+    writer->stop();
+    EXPECT_FALSE(writer->isRunning());
+}
+
+// Test batch processing with some entries
+TEST_F(WriterTest, ProcessBatchEntries)
+{
+    std::vector<QueueItem> testItems = {
+        QueueItem{LogEntry{LogEntry::ActionType::READ, "location1", "controller1", "processor1", "subject1"}},
+        QueueItem{LogEntry{LogEntry::ActionType::CREATE, "location2", "controller2", "processor2", "subject2"}},
+        QueueItem{LogEntry{LogEntry::ActionType::UPDATE, "location3", "controller3", "processor3", "subject3"}}};
+
+    BufferQueue::ProducerToken producerToken = queue->createProducerToken();
+
+    // Enqueue test entries
+    queue->enqueueBatchBlocking(testItems, producerToken, std::chrono::milliseconds(100));
+
+    // Instantiate writer with a batch size equal to number of test items
+    writer = std::make_unique<Writer>(*queue, storage, testItems.size());
+    writer->start();
+
+    // Give some time for the writer thread to process the entries.
+    std::this_thread::sleep_for(std::chrono::milliseconds(200));
+
+    // Verify that the queue is empty after processing.
+    EXPECT_EQ(queue->size(), 0);
+
+    writer->stop();
+}
+
+// Test behavior when the queue is empty
+TEST_F(WriterTest, EmptyQueue)
+{
+    EXPECT_EQ(queue->size(), 0);
+
+    writer = std::make_unique<Writer>(*queue, storage);
+    writer->start();
+
+    // Give some time to verify it handles empty queue gracefully
+    std::this_thread::sleep_for(std::chrono::milliseconds(200));
+    EXPECT_EQ(queue->size(), 0);
+
+    writer->stop();
+}
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