diff --git a/tests/test_profiles.py b/tests/test_profiles.py
new file mode 100644
index 0000000..b386d74
--- /dev/null
+++ b/tests/test_profiles.py
@@ -0,0 +1,124 @@
+import pytest
+from unittest.mock import patch, MagicMock
+import sys
+
+from confdoc.profiles.manager import ProfileManager
+
+
+class TestProfileManager:
+    def test_list_profiles(self):
+        manager = ProfileManager()
+        profiles = manager.list_profiles()
+        assert "development" in profiles
+        assert "staging" in profiles
+        assert "production" in profiles
+    
+    def test_get_profile_info(self):
+        manager = ProfileManager()
+        info = manager.get_profile_info("development")
+        assert info is not None
+        assert info["name"] == "Development"
+        assert "validation" in info
+    
+    def test_load_profile(self):
+        manager = ProfileManager()
+        profile = manager.load_profile("production")
+        assert profile is not None
+        assert profile["name"] == "Production"
+    
+    def test_load_nonexistent_profile(self):
+        manager = ProfileManager()
+        profile = manager.load_profile("nonexistent")
+        assert profile is None
+    
+    def test_save_and_load_custom_profile(self):
+        manager = ProfileManager()
+        custom_profile = {
+            "name": "Custom",
+            "description": "A custom profile",
+            "validation": {"strict": True},
+            "overrides": {"custom_key": "custom_value"}
+        }
+        manager.save_profile("custom_test", custom_profile)
+        
+        loaded = manager.load_profile("custom_test")
+        assert loaded is not None
+        assert loaded["name"] == "Custom"
+    
+    def test_apply_profile_modifies_schema(self):
+        manager = ProfileManager()
+        profile = manager.load_profile("development")
+        schema = {
+            "type": "object",
+            "properties": {}
+        }
+        
+        result = manager.apply_profile(schema, profile)
+        assert result is not None
+    
+    def test_create_profile_from_config(self):
+        manager = ProfileManager()
+        config = {
+            "debug": True,
+            "log_level": "DEBUG",
+            "nested": {"key": "value"}
+        }
+        
+        profile = manager.create_profile_from_config(config, "test_profile", "Test description")
+        assert profile["name"] == "test_profile"
+        assert profile["description"] == "Test description"
+        assert "debug" in profile["overrides"]
+        assert "log_level" in profile["overrides"]
+    
+    def test_merge_profiles(self):
+        manager = ProfileManager()
+        base = {
+            "name": "Base",
+            "validation": {"strict": False},
+            "overrides": {"key1": "value1"}
+        }
+        override = {
+            "name": "Override",
+            "validation": {"strict": True},
+            "overrides": {"key2": "value2"}
+        }
+        
+        merged = manager.merge_profiles(base, override)
+        assert merged["name"] == "Override"
+        assert merged["validation"]["strict"] is True
+        assert "key1" in merged["overrides"]
+        assert "key2" in merged["overrides"]
+    
+    def test_get_environment_overrides(self):
+        manager = ProfileManager()
+        env_vars = {
+            "CONFDOC_DEBUG": "true",
+            "CONFDOC_LOG_LEVEL": "INFO",
+            "OTHER_VAR": "ignored"
+        }
+        
+        overrides = manager.get_environment_overrides(env_vars)
+        assert "debug" in overrides
+        assert overrides["debug"] is True
+        assert "log_level" in overrides
+        assert overrides["log_level"] == "INFO"
+        assert "OTHER_VAR" not in overrides
+    
+    def test_parse_env_value_boolean(self):
+        manager = ProfileManager()
+        assert manager._parse_env_value("true") is True
+        assert manager._parse_env_value("True") is True
+        assert manager._parse_env_value("false") is False
+    
+    def test_parse_env_value_integer(self):
+        manager = ProfileManager()
+        assert manager._parse_env_value("123") == 123
+        assert manager._parse_env_value("0") == 0
+    
+    def test_parse_env_value_float(self):
+        manager = ProfileManager()
+        assert manager._parse_env_value("3.14") == 3.14
+    
+    def test_parse_env_value_string(self):
+        manager = ProfileManager()
+        assert manager._parse_env_value("hello") == "hello"