diff --git a/tests/test_recorder.py b/tests/test_recorder.py
new file mode 100644
index 0000000..7c8c474
--- /dev/null
+++ b/tests/test_recorder.py
@@ -0,0 +1,304 @@
+"""Tests for the recorder module."""
+
+import pytest
+from unittest.mock import MagicMock, patch
+
+from api_snapshot.recorder.recorder import (
+    RecordedRequest,
+    RecordedResponse,
+    RequestResponsePair,
+    RecordingSession,
+    record_session,
+    record_multiple
+)
+
+
+class TestRecordedRequest:
+    """Tests for RecordedRequest class."""
+    
+    def test_create_request(self):
+        """Test creating a recorded request."""
+        req = RecordedRequest(
+            method="GET",
+            url="https://api.example.com/users",
+            headers={"Accept": "application/json"},
+            body=None
+        )
+        
+        assert req.method == "GET"
+        assert req.url == "https://api.example.com/users"
+        assert req.headers == {"Accept": "application/json"}
+        assert req.body is None
+        assert req.timestamp is not None
+    
+    def test_request_to_dict(self):
+        """Test converting request to dictionary."""
+        req = RecordedRequest(
+            method="POST",
+            url="https://api.example.com/data",
+            headers={"Content-Type": "application/json"},
+            body='{"key": "value"}'
+        )
+        
+        data = req.to_dict()
+        
+        assert data["method"] == "POST"
+        assert data["url"] == "https://api.example.com/data"
+        assert data["headers"] == {"Content-Type": "application/json"}
+        assert data["body"] == '{"key": "value"}'
+        assert "timestamp" in data
+    
+    def test_request_from_dict(self):
+        """Test creating request from dictionary."""
+        data = {
+            "method": "PUT",
+            "url": "https://api.example.com/resource/1",
+            "headers": {"Authorization": "Bearer token"},
+            "body": "updated data",
+            "timestamp": "2024-01-01T12:00:00"
+        }
+        
+        req = RecordedRequest.from_dict(data)
+        
+        assert req.method == "PUT"
+        assert req.url == "https://api.example.com/resource/1"
+        assert req.headers == {"Authorization": "Bearer token"}
+        assert req.body == "updated data"
+        assert req.timestamp == "2024-01-01T12:00:00"
+
+
+class TestRecordedResponse:
+    """Tests for RecordedResponse class."""
+    
+    def test_create_response(self):
+        """Test creating a recorded response."""
+        resp = RecordedResponse(
+            status_code=200,
+            headers={"Content-Type": "application/json"},
+            body='{"success": true}',
+            latency_ms=150
+        )
+        
+        assert resp.status_code == 200
+        assert resp.headers == {"Content-Type": "application/json"}
+        assert resp.body == '{"success": true}'
+        assert resp.latency_ms == 150
+    
+    def test_response_to_dict(self):
+        """Test converting response to dictionary."""
+        resp = RecordedResponse(
+            status_code=404,
+            headers={"Content-Type": "text/plain"},
+            body="Not Found",
+            latency_ms=50
+        )
+        
+        data = resp.to_dict()
+        
+        assert data["status_code"] == 404
+        assert data["headers"] == {"Content-Type": "text/plain"}
+        assert data["body"] == "Not Found"
+        assert data["latency_ms"] == 50
+    
+    def test_response_from_dict(self):
+        """Test creating response from dictionary."""
+        data = {
+            "status_code": 500,
+            "headers": {"Content-Type": "application/json"},
+            "body": '{"error": "internal"}',
+            "latency_ms": 300
+        }
+        
+        resp = RecordedResponse.from_dict(data)
+        
+        assert resp.status_code == 500
+        assert resp.headers == {"Content-Type": "application/json"}
+        assert resp.body == '{"error": "internal"}'
+        assert resp.latency_ms == 300
+
+
+class TestRequestResponsePair:
+    """Tests for RequestResponsePair class."""
+    
+    def test_create_pair(self, sample_request, sample_response):
+        """Test creating a request-response pair."""
+        pair = RequestResponsePair(
+            request=sample_request,
+            response=sample_response
+        )
+        
+        assert pair.request == sample_request
+        assert pair.response == sample_response
+    
+    def test_pair_to_dict(self, sample_pair):
+        """Test converting pair to dictionary."""
+        data = sample_pair.to_dict()
+        
+        assert "request" in data
+        assert "response" in data
+        assert data["request"]["method"] == "GET"
+        assert data["response"]["status_code"] == 200
+    
+    def test_pair_from_dict(self, sample_pair):
+        """Test creating pair from dictionary."""
+        data = sample_pair.to_dict()
+        restored = RequestResponsePair.from_dict(data)
+        
+        assert restored.request.method == sample_pair.request.method
+        assert restored.response.status_code == sample_pair.response.status_code
+
+
+class TestRecordingSession:
+    """Tests for RecordingSession class."""
+    
+    def test_init_session(self):
+        """Test initializing a recording session."""
+        session = RecordingSession()
+        
+        assert session.base_url is None
+        assert session.on_request is None
+        assert session.recordings == []
+    
+    def test_init_with_base_url(self):
+        """Test initializing with base URL."""
+        session = RecordingSession(base_url="https://api.example.com")
+        
+        assert session.base_url == "https://api.example.com"
+    
+    def test_build_url_absolute(self):
+        """Test building URL for absolute URL."""
+        session = RecordingSession()
+        
+        url = session._build_url("https://other.com/api")
+        
+        assert url == "https://other.com/api"
+    
+    def test_build_url_relative(self):
+        """Test building URL for relative URL."""
+        session = RecordingSession(base_url="https://api.example.com")
+        
+        url = session._build_url("/users")
+        
+        assert url == "https://api.example.com/users"
+    
+    def test_build_url_relative_no_base(self):
+        """Test building URL for relative URL without base."""
+        session = RecordingSession()
+        
+        url = session._build_url("/users")
+        
+        assert url == "/users"
+    
+    def test_record_request_adds_to_recordings(self):
+        """Test that record_request adds to recordings."""
+        session = RecordingSession()
+        
+        with patch('api_snapshot.recorder.recorder.requests.Session.request') as mock_request:
+            mock_response = MagicMock()
+            mock_response.status_code = 200
+            mock_response.headers = {"Content-Type": "application/json"}
+            mock_response.text = '{"success": true}'
+            mock_request.return_value = mock_response
+            
+            session.record_request("GET", "https://api.example.com/users")
+            
+            assert len(session.recordings) == 1
+            assert session.recordings[0].request.method == "GET"
+            assert session.recordings[0].response.status_code == 200
+    
+    def test_on_request_callback(self):
+        """Test on_request callback is called."""
+        callback = MagicMock()
+        session = RecordingSession(on_request=callback)
+        
+        with patch('api_snapshot.recorder.recorder.requests.Session.request') as mock_request:
+            mock_response = MagicMock()
+            mock_response.status_code = 200
+            mock_response.headers = {}
+            mock_response.text = '{}'
+            mock_request.return_value = mock_response
+            
+            session.record_request("GET", "https://api.example.com")
+            
+            callback.assert_called_once()
+    
+    def test_clear_recordings(self):
+        """Test clearing recordings."""
+        session = RecordingSession()
+        
+        with patch('api_snapshot.recorder.recorder.requests.Session.request') as mock_request:
+            mock_response = MagicMock()
+            mock_response.status_code = 200
+            mock_response.headers = {}
+            mock_response.text = '{}'
+            mock_request.return_value = mock_response
+            
+            session.record_request("GET", "https://api.example.com")
+            assert len(session.recordings) == 1
+            
+            session.clear()
+            assert len(session.recordings) == 0
+    
+    def test_get_recordings(self):
+        """Test getting recordings."""
+        session = RecordingSession()
+        
+        with patch('api_snapshot.recorder.recorder.requests.Session.request') as mock_request:
+            mock_response = MagicMock()
+            mock_response.status_code = 200
+            mock_response.headers = {}
+            mock_response.text = '{}'
+            mock_request.return_value = mock_response
+            
+            session.record_request("GET", "https://api.example.com/1")
+            session.record_request("GET", "https://api.example.com/2")
+            
+            recordings = session.get_recordings()
+            
+            assert len(recordings) == 2
+            assert recordings[0].request.url.endswith("/1")
+            assert recordings[1].request.url.endswith("/2")
+
+
+class TestRecordFunctions:
+    """Tests for record_session and record_multiple functions."""
+    
+    def test_record_session(self):
+        """Test record_session function."""
+        with patch('api_snapshot.recorder.recorder.requests.Session.request') as mock_request:
+            mock_response = MagicMock()
+            mock_response.status_code = 200
+            mock_response.headers = {"Content-Type": "application/json"}
+            mock_response.text = '{"data": "test"}'
+            mock_request.return_value = mock_response
+            
+            pairs = record_session(
+                url="https://api.example.com/api",
+                method="GET"
+            )
+            
+            assert len(pairs) == 1
+            assert pairs[0].request.method == "GET"
+            assert pairs[0].response.status_code == 200
+    
+    def test_record_multiple(self):
+        """Test record_multiple function."""
+        with patch('api_snapshot.recorder.recorder.requests.Session.request') as mock_request:
+            mock_response = MagicMock()
+            mock_response.status_code = 200
+            mock_response.headers = {}
+            mock_response.text = '{}'
+            mock_request.return_value = mock_response
+            
+            config = [
+                {"method": "GET", "url": "https://api.example.com/1"},
+                {"method": "POST", "url": "https://api.example.com/2"},
+                {"method": "DELETE", "url": "https://api.example.com/3"}
+            ]
+            
+            pairs = record_multiple(requests_config=config)
+            
+            assert len(pairs) == 3
+            assert pairs[0].request.method == "GET"
+            assert pairs[1].request.method == "POST"
+            assert pairs[2].request.method == "DELETE"