diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..115238e
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,118 @@
+import pytest
+from pathlib import Path
+import tempfile
+import os
+
+from code_privacy_shield.config import Config
+
+
+class TestConfig:
+    def test_default_config_exists(self):
+        config = Config()
+        assert config.config is not None
+        assert "general" in config.config
+        assert "redaction" in config.config
+
+    def test_get_redaction_categories(self):
+        config = Config()
+        categories = config.get_redaction_categories()
+        assert "api_keys" in categories
+        assert "pii" in categories
+
+    def test_get_exclude_patterns(self):
+        config = Config()
+        patterns = config.get_exclude_patterns()
+        assert isinstance(patterns, list)
+        assert "*.pyc" in patterns
+
+    def test_get_custom_patterns(self):
+        config = Config()
+        patterns = config.get_custom_patterns()
+        assert isinstance(patterns, list)
+
+    def test_is_category_enabled(self):
+        config = Config()
+        assert config.is_category_enabled("api_keys")
+        assert config.is_category_enabled("nonexistent")  # Defaults to True
+
+    def test_is_preview_mode(self):
+        config = Config()
+        config.reset_to_default()
+        assert not config.is_preview_mode()
+
+    def test_get_with_dot_notation(self):
+        config = Config()
+        config.reset_to_default()
+        value = config.get("general.preview_mode")
+        assert value is False
+
+    def test_reset_to_default(self):
+        config = Config()
+        config.set("general.preview_mode", True)
+        config.reset_to_default()
+        config2 = Config()
+        config2.reset_to_default()
+        assert not config2.is_preview_mode()
+        config.set("general.preview_mode", True)
+        assert config.is_preview_mode()
+
+    def test_is_quiet_mode(self):
+        config = Config()
+        assert not config.is_quiet_mode()
+        config.set("general.quiet_mode", True)
+        assert config.is_quiet_mode()
+
+    def test_should_preserve_structure(self):
+        config = Config()
+        assert config.should_preserve_structure()
+
+    def test_should_recursive(self):
+        config = Config()
+        assert config.should_recursive()
+
+    def test_get_output_format(self):
+        config = Config()
+        assert config.get_output_format() == "text"
+
+    def test_get_with_dot_notation(self):
+        config = Config()
+        config.reset_to_default()
+        value = config.get("general.preview_mode")
+        assert value is False
+
+    def test_reset_to_default(self):
+        config = Config()
+        config.set("general.preview_mode", True)
+        config.reset_to_default()
+        assert not config.is_preview_mode()
+
+    def test_save_config(self, tmp_path):
+        config = Config()
+        config.set("test.value", "test_data")
+        save_path = tmp_path / "saved.toml"
+        saved = config.save(str(save_path))
+        assert saved
+        assert save_path.exists()
+
+    def test_merge_configs(self):
+        config = Config()
+        config._merge_config(config.config, {"new_section": {"key": "value"}})
+        assert config.get("new_section.key") == "value"
+
+    def test_get_project_config_path(self):
+        path = Config.get_project_config_path()
+        assert path == Path(".cps.toml")
+
+    def test_get_default_config_path(self):
+        path = Config.get_default_config_path()
+        assert ".config" in str(path)
+        assert "cps" in str(path)
+
+    def test_create_example_config(self, tmp_path):
+        example_path = tmp_path / "example.toml"
+        created = Config.create_example_config(str(example_path))
+        assert created
+        assert example_path.exists()
+        content = example_path.read_text()
+        assert "general" in content
+        assert "redaction" in content