diff --git a/.gitignore b/.gitignore
index 3893fce..ea62fd7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,3 +31,24 @@
 /migrations/__test_user.sql
 /migrations/__test_user_item.sql
 /tina4_python.egg-info/
+
+# Python cache
+__pycache__/
+*.pyc
+
+# Logs
+*.log
+
+# Secrets & test keys
+*.key
+*.cert
+.env
+
+# Databases
+*.db
+
+# Coverage
+.coverage
+
+# Virtual environment
+.venv/
diff --git a/tina4_python/tests/unit/debug/test_debug.py b/tina4_python/tests/unit/debug/test_debug.py
new file mode 100644
index 0000000..f5c9300
--- /dev/null
+++ b/tina4_python/tests/unit/debug/test_debug.py
@@ -0,0 +1,114 @@
+import os
+import pytest
+import logging
+from unittest import mock
+from tina4_python import Debug
+from tina4_python import Constant
+
+
+@pytest.fixture(scope="function")
+def log_dir():
+    path = os.path.join(".", "logs")
+    os.makedirs(path, exist_ok=True)
+    yield path
+    for f in os.listdir(path):
+        os.remove(os.path.join(path, f))
+
+
+# DEBUG-001
+def test_info_log_creates_entry(log_dir):
+    Debug.info("Test info message")
+    assert os.path.exists(os.path.join(log_dir, "debug.log"))
+
+
+# DEBUG-002
+def test_error_log(log_dir):
+    Debug.error("Test error message")
+    with open(os.path.join(log_dir, "debug.log")) as log_file:
+        contents = log_file.read()
+        assert "ERROR" in contents
+
+
+# DEBUG-003
+def test_debug_log(log_dir):
+    Debug.debug("Debugging things")
+    with open(os.path.join(log_dir, "debug.log")) as log_file:
+        contents = log_file.read()
+        assert "DEBUG" in contents
+
+
+# DEBUG-004
+def test_warning_log(log_dir):
+    Debug.warning("Something to warn")
+    with open(os.path.join(log_dir, "debug.log")) as log_file:
+        contents = log_file.read()
+        assert "WARNING" in contents
+
+
+# DEBUG-005
+def test_multiple_arguments(log_dir):
+    Debug.info("Multiple", "args", 123)
+    with open(os.path.join(log_dir, "debug.log")) as log_file:
+        contents = log_file.read()
+        assert "Multiple args 123" in contents
+
+
+# DEBUG-006
+@mock.patch.dict(os.environ, {"TINA4_DEBUG_LEVEL": Constant.TINA4_LOG_INFO})
+def test_custom_log_file():
+    import time
+    from logging import getLogger
+
+    log_name = "custom.log"
+    file_path = os.path.join(".", "logs", log_name)
+
+    if os.path.exists(file_path):
+        os.remove(file_path)
+
+    logger = getLogger('TINA4')
+    logger.handlers.clear()
+
+    Debug.info("Custom file test", file_name=log_name)
+
+    time.sleep(0.2)
+
+    assert os.path.exists(file_path)
+
+# DEBUG-007
+@mock.patch.dict(os.environ, {"TINA4_DEBUG_LEVEL": Constant.TINA4_LOG_DEBUG})
+def test_debug_level_environment_filter(log_dir):
+    Debug.debug("Filtered debug")
+    with open(os.path.join(log_dir, "debug.log")) as log_file:
+        assert "Filtered debug" in log_file.read()
+
+
+# DEBUG-009
+def test_empty_log_message(log_dir):
+    Debug.info()
+    with open(os.path.join(log_dir, "debug.log")) as log_file:
+        contents = log_file.read()
+        assert contents.strip()  # Should contain at least timestamp
+
+
+# DEBUG-010
+def test_invalid_level_fallback(log_dir):
+    Debug("Test message", "INVALID_LEVEL")
+    with open(os.path.join(log_dir, "debug.log")) as log_file:
+        contents = log_file.read()
+        assert "Test message" in contents
+
+
+# DEBUG-011
+def test_non_string_args(log_dir):
+    Debug.info({"key": "value"}, ["list", 2])
+    with open(os.path.join(log_dir, "debug.log")) as log_file:
+        contents = log_file.read()
+        assert "key" in contents and "list" in contents
+
+
+# DEBUG-012
+@mock.patch("tina4_python.Debug.RotatingFileHandler")
+def test_invalid_log_path(mock_handler):
+    mock_handler.side_effect = OSError("Path error")
+    with pytest.raises(OSError):
+        Debug.info("Path test", file_name="/invalid/path.log")