diff --git a/slsReceiverSoftware/src/DataProcessor.h b/slsReceiverSoftware/src/DataProcessor.h
index d09a9ca3f..458e750c5 100644
--- a/slsReceiverSoftware/src/DataProcessor.h
+++ b/slsReceiverSoftware/src/DataProcessor.h
@@ -92,6 +92,15 @@ class DataProcessor : private virtual slsDetectorDefs, public ThreadObject {
                                                    size_t &, void *),
                                       void *arg);
 
+  protected:
+    /**
+     * Align corresponding digital bits together (CTB only if ctbDbitlist is not
+     * empty)
+     * set variable reorder to true if, data should be rearranged such that
+     * individual digital bits from all samples are consecutive in memory
+     */
+    void ArrangeDbitData(size_t &size, char *data);
+
   private:
     void RecordFirstIndex(uint64_t fnum);
 
@@ -138,14 +147,6 @@ class DataProcessor : private virtual slsDetectorDefs, public ThreadObject {
 
     void PadMissingPackets(sls_receiver_header header, char *data);
 
-    /**
-     * Align corresponding digital bits together (CTB only if ctbDbitlist is not
-     * empty)
-     * set variable reorder to true if, data should be rearranged such that
-     * individual digital bits from all samples are consecutive in memory
-     */
-    void ArrangeDbitData(size_t &size, char *data);
-
     void CropImage(size_t &size, char *data);
 
     static const std::string typeName;
diff --git a/slsReceiverSoftware/tests/CMakeLists.txt b/slsReceiverSoftware/tests/CMakeLists.txt
index e656b51ad..9a9455408 100755
--- a/slsReceiverSoftware/tests/CMakeLists.txt
+++ b/slsReceiverSoftware/tests/CMakeLists.txt
@@ -3,6 +3,9 @@
 target_sources(tests PRIVATE 
     ${CMAKE_CURRENT_SOURCE_DIR}/test-GeneralData.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test-CircularFifo.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test-ArrangeDataBasedOnBitList.cpp
 )
 
 target_include_directories(tests PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../src>")
+
+message(STATUS "Resolved path: ${CMAKE_CURRENT_SOURCE_DIR}/../src")
\ No newline at end of file
diff --git a/slsReceiverSoftware/tests/test-ArrangeDataBasedOnBitList.cpp b/slsReceiverSoftware/tests/test-ArrangeDataBasedOnBitList.cpp
new file mode 100644
index 000000000..3012ddf64
--- /dev/null
+++ b/slsReceiverSoftware/tests/test-ArrangeDataBasedOnBitList.cpp
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: LGPL-3.0-or-other
+// Copyright (C) 2025 Contributors to the SLS Detector Package
+/************************************************
+ * @file test-ArrangeDataBasedOnBitList.cpp
+ * @short test case for DataProcessor member function ArrangeDbitData,
+ ***********************************************/
+
+#include "DataProcessor.h"
+#include "GeneralData.h"
+#include "catch.hpp"
+#include <vector>
+
+namespace sls {
+
+// dummy GeneralData class for testing
+class GeneralDataTest : public GeneralData {
+
+  public:
+    int GetNumberOfAnalogDatabytes() { return nAnalogBytes; };
+
+    int GetNumberOfDigitalDatabytes() { return nDigitalBytes; };
+
+    int GetNumberOfTransceiverDatabytes() { return nTransceiverBytes; };
+
+    void SetNumberOfAnalogDatabytes(int value) { nAnalogBytes = value; }
+
+    void SetNumberOfDigitalDatabytes(int value) { nDigitalBytes = value; }
+
+    void SetNumberOfTransceiverDatabytes(int value) {
+        nTransceiverBytes = value;
+    }
+
+  private:
+    int nAnalogBytes;
+    int nDigitalBytes;
+    int nTransceiverBytes;
+};
+
+// oke maybe just make it static
+class DataProcessorTest : public DataProcessor {
+  public:
+    DataProcessorTest() : DataProcessor(0){};
+    ~DataProcessorTest(){};
+    void ArrangeDbitData(size_t &size, char *data) {
+        DataProcessor::ArrangeDbitData(size, data);
+    }
+};
+
+TEST_CASE("Arrange with reorder false") {
+    DataProcessorTest dataprocessor;
+
+    std::vector<int> bitlist{1, 4, 5};
+    dataprocessor.SetCtbDbitList(bitlist);
+
+    size_t num_digital_samples = 5; // size_t or uint8_t ?
+    size_t num_digital_bytes = num_digital_samples * 8;
+    size_t num_analog_bytes = 1;
+    size_t num_transceiver_bytes = 2;
+    size_t random_offset_bytes = 0;
+
+    size_t size = num_analog_bytes + num_digital_bytes + num_transceiver_bytes +
+                  random_offset_bytes;
+
+    char *data = new char[size];
+
+    char dummy_value = static_cast<char>(125);
+    memset(data, dummy_value, num_analog_bytes);
+    memset(data + num_analog_bytes, 0xFF,
+           num_digital_bytes); // all digital bits are one
+    memset(data + num_digital_bytes + num_analog_bytes, dummy_value,
+           num_transceiver_bytes);
+
+    GeneralDataTest *generaldata = new GeneralDataTest;
+    generaldata->SetNumberOfAnalogDatabytes(num_analog_bytes);
+    generaldata->SetNumberOfDigitalDatabytes(num_digital_bytes);
+    generaldata->SetNumberOfTransceiverDatabytes(num_transceiver_bytes);
+
+    dataprocessor.SetGeneralData(generaldata);
+
+    size_t new_num_digital_bytes =
+        (bitlist.size() / 8 + static_cast<size_t>(bitlist.size() % 8 != 0)) *
+        num_digital_samples;
+
+    size_t new_size =
+        num_analog_bytes + num_transceiver_bytes + new_num_digital_bytes;
+
+    char *new_data = new char[new_size];
+
+    memset(new_data, dummy_value, num_analog_bytes);
+
+    // TODO: Make test more explicit and less generic
+    size_t num_bytes_for_bitlist =
+        bitlist.size() / 8 + static_cast<size_t>(bitlist.size() % 8 != 0);
+
+    // 125 7 7 7 7 7 125 125
+    for (size_t sample = 0; sample < num_digital_samples; ++sample) {
+        if (bitlist.size() / 8 != 0) {
+            memset(new_data + sample * num_bytes_for_bitlist + num_analog_bytes,
+                   0xFF,
+                   bitlist.size() / 8); // set to 1
+        } else if (bitlist.size() % 8 != 0) {
+            memset(new_data + sample * num_bytes_for_bitlist +
+                       bitlist.size() / 8 + num_analog_bytes,
+                   static_cast<char>(pow(2, (bitlist.size() % 8)) - 1),
+                   1); // convert binary number to decimal
+        }
+    }
+
+    memset(new_data + new_num_digital_bytes + num_analog_bytes, dummy_value,
+           num_transceiver_bytes);
+
+    dataprocessor.ArrangeDbitData(size, data);
+
+    CHECK(size == new_size);
+
+    CHECK(memcmp(data, new_data, size) == 0);
+
+    // Free allocated memory
+    delete[] data;
+    delete[] new_data;
+    delete generaldata;
+}
+
+// TEST_CASE("Arrange with reorder on") {
+
+//}
+
+// test case reorder on and bitoffset set
+
+// test with different samples
+
+// test with sample number not divisable and ctbitlist not divisable
+
+} // namespace sls