diff --git a/tests/src/tracefile/writer/TXTHTraceFileWriter_test.cpp b/tests/src/tracefile/writer/TXTHTraceFileWriter_test.cpp
new file mode 100644
index 0000000..b1fadd7
--- /dev/null
+++ b/tests/src/tracefile/writer/TXTHTraceFileWriter_test.cpp
@@ -0,0 +1,104 @@
+//
+// Copyright (c) 2024, Bayerische Motoren Werke Aktiengesellschaft (BMW AG)
+// SPDX-License-Identifier: MPL-2.0
+//
+
+#include <gtest/gtest.h>
+#include "osi-utilities/tracefile/writer/TXTHTraceFileWriter.h"
+#include "osi_groundtruth.pb.h"
+#include "osi_sensorview.pb.h"
+
+#include <filesystem>
+#include <fstream>
+
+class TxthTraceFileWriterTest : public ::testing::Test {
+protected:
+    osi3::TXTHTraceFileWriter writer_;
+    const std::string test_file_gt_ = "test_output_gt.txth";
+    const std::string test_file_sv_ = "test_output_sv.txth";
+
+    void TearDown() override {
+        writer_.Close();
+        std::filesystem::remove(test_file_gt_);
+        std::filesystem::remove(test_file_sv_);
+    }
+};
+
+TEST_F(TxthTraceFileWriterTest, OpenWithValidExtension) {
+    EXPECT_TRUE(writer_.Open(test_file_gt_));
+}
+
+TEST_F(TxthTraceFileWriterTest, OpenWithInvalidExtension) {
+    EXPECT_FALSE(writer_.Open("test.invalid"));
+}
+
+TEST_F(TxthTraceFileWriterTest, WriteGroundTruthMessage) {
+    ASSERT_TRUE(writer_.Open(test_file_gt_));
+
+    osi3::GroundTruth ground_truth;
+
+    ground_truth.mutable_timestamp()->set_seconds(123);
+    ground_truth.mutable_timestamp()->set_nanos(456);
+
+    EXPECT_TRUE(writer_.WriteMessage(ground_truth));
+
+    writer_.Close();
+
+    // Verify file content
+    std::ifstream file(test_file_gt_);
+    std::string content((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
+    EXPECT_TRUE(content.find("seconds: 123") != std::string::npos);
+    EXPECT_TRUE(content.find("nanos: 456") != std::string::npos);
+}
+
+TEST_F(TxthTraceFileWriterTest, WriteSensorViewMessage) {
+    ASSERT_TRUE(writer_.Open(test_file_sv_));
+
+    osi3::SensorView sensor_view;
+    sensor_view.mutable_timestamp()->set_seconds(789);
+    sensor_view.mutable_timestamp()->set_nanos(101);
+
+    EXPECT_TRUE(writer_.WriteMessage(sensor_view));
+
+    writer_.Close();
+
+    std::ifstream file(test_file_sv_);
+    std::string content((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
+    EXPECT_TRUE(content.find("seconds: 789") != std::string::npos);
+    EXPECT_TRUE(content.find("nanos: 101") != std::string::npos);
+}
+
+TEST_F(TxthTraceFileWriterTest, WriteMessageToClosedFile) {
+    osi3::GroundTruth ground_truth;
+    EXPECT_FALSE(writer_.WriteMessage(ground_truth));
+}
+
+TEST_F(TxthTraceFileWriterTest, MultipleMessages) {
+    ASSERT_TRUE(writer_.Open(test_file_gt_));
+
+    osi3::GroundTruth ground_truth_1;
+    osi3::GroundTruth ground_truth_2;
+    ground_truth_1.mutable_timestamp()->set_seconds(111);
+    ground_truth_2.mutable_timestamp()->set_seconds(222);
+
+    EXPECT_TRUE(writer_.WriteMessage(ground_truth_1));
+    EXPECT_TRUE(writer_.WriteMessage(ground_truth_2));
+
+    writer_.Close();
+
+    std::ifstream file(test_file_gt_);
+    std::string content((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
+    EXPECT_TRUE(content.find("seconds: 111") != std::string::npos);
+    EXPECT_TRUE(content.find("seconds: 222") != std::string::npos);
+}
+
+TEST_F(TxthTraceFileWriterTest, CloseAndReopenFile) {
+    ASSERT_TRUE(writer_.Open(test_file_gt_));
+    writer_.Close();
+    EXPECT_TRUE(writer_.Open(test_file_gt_));
+}
+
+TEST_F(TxthTraceFileWriterTest, WriteToReadOnlyLocation) {
+    const std::string readonly_path = "/root/test.txth";
+    EXPECT_FALSE(writer_.Open(readonly_path));
+}