diff --git a/test/integration/test_error_scenarios.py b/test/integration/test_error_scenarios.py
new file mode 100644
index 0000000..d99cf78
--- /dev/null
+++ b/test/integration/test_error_scenarios.py
@@ -0,0 +1,405 @@
+# -*- coding: utf-8 -*-
+
+"""
+Integration tests for error scenarios using a simulated bad-behaving CouchDB.
+
+This module tests pycouchdb library behavior under various error conditions
+by using a test server that can simulate different failure modes.
+"""
+
+import pytest
+import pycouchdb
+import threading
+import time
+import json
+from http.server import HTTPServer, BaseHTTPRequestHandler
+from urllib.parse import urlparse, parse_qs
+import socketserver
+
+
+class BadCouchDBHandler(BaseHTTPRequestHandler):
+    """HTTP handler that simulates various CouchDB error conditions."""
+    
+    def __init__(self, *args, error_scenario=None, **kwargs):
+        self.error_scenario = error_scenario
+        super().__init__(*args, **kwargs)
+    
+    def do_GET(self):
+        """Handle GET requests with various error scenarios."""
+        if self.error_scenario == 'timeout':
+            time.sleep(10)  # Simulate timeout
+        elif self.error_scenario == 'server_error':
+            self.send_response(500)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"error": "Internal Server Error"}).encode())
+        elif self.error_scenario == 'malformed_json':
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(b'{"invalid": json}')  # Malformed JSON
+        elif self.error_scenario == 'connection_refused':
+            # This would be handled at the connection level, not HTTP level
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"couchdb": "Welcome"}).encode())
+        else:
+            # Normal response
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"couchdb": "Welcome", "version": "3.2.0"}).encode())
+    
+    def do_POST(self):
+        """Handle POST requests."""
+        if self.error_scenario == 'timeout':
+            time.sleep(10)
+        elif self.error_scenario == 'server_error':
+            self.send_response(500)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"error": "Internal Server Error"}).encode())
+        else:
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"ok": True}).encode())
+    
+    def do_PUT(self):
+        """Handle PUT requests."""
+        if self.error_scenario == 'timeout':
+            time.sleep(10)
+        elif self.error_scenario == 'server_error':
+            self.send_response(500)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"error": "Internal Server Error"}).encode())
+        else:
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"ok": True}).encode())
+    
+    def do_DELETE(self):
+        """Handle DELETE requests."""
+        if self.error_scenario == 'timeout':
+            time.sleep(10)
+        elif self.error_scenario == 'server_error':
+            self.send_response(500)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"error": "Internal Server Error"}).encode())
+        else:
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(json.dumps({"ok": True}).encode())
+    
+    def do_HEAD(self):
+        """Handle HEAD requests."""
+        if self.error_scenario == 'timeout':
+            time.sleep(10)
+        elif self.error_scenario == 'server_error':
+            self.send_response(500)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+        else:
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+    
+    def log_message(self, format, *args):
+        """Suppress log messages during testing."""
+        pass
+
+
+class BadCouchDBServer:
+    """Test server that can simulate various CouchDB error conditions."""
+    
+    def __init__(self, port=0, error_scenario=None):
+        self.port = port
+        self.error_scenario = error_scenario
+        self.server = None
+        self.thread = None
+    
+    def start(self):
+        """Start the test server."""
+        def handler(*args, **kwargs):
+            return BadCouchDBHandler(*args, error_scenario=self.error_scenario, **kwargs)
+        
+        self.server = HTTPServer(('localhost', self.port), handler)
+        self.port = self.server.server_address[1]
+        self.thread = threading.Thread(target=self.server.serve_forever)
+        self.thread.daemon = True
+        self.thread.start()
+        time.sleep(0.1)  # Give server time to start
+    
+    def stop(self):
+        """Stop the test server."""
+        if self.server:
+            self.server.shutdown()
+            self.server.server_close()
+        if self.thread:
+            self.thread.join(timeout=1)
+    
+    @property
+    def url(self):
+        """Get the server URL."""
+        return f'http://localhost:{self.port}/'
+
+
+@pytest.fixture
+def bad_couchdb_server():
+    """Fixture for bad behaving CouchDB server."""
+    server = None
+    try:
+        yield server
+    finally:
+        if server:
+            server.stop()
+
+
+@pytest.fixture
+def timeout_server():
+    """Fixture for timeout scenario."""
+    server = BadCouchDBServer(error_scenario='timeout')
+    server.start()
+    try:
+        yield server
+    finally:
+        server.stop()
+
+
+@pytest.fixture
+def server_error_server():
+    """Fixture for server error scenario."""
+    server = BadCouchDBServer(error_scenario='server_error')
+    server.start()
+    try:
+        yield server
+    finally:
+        server.stop()
+
+
+@pytest.fixture
+def malformed_json_server():
+    """Fixture for malformed JSON scenario."""
+    server = BadCouchDBServer(error_scenario='malformed_json')
+    server.start()
+    try:
+        yield server
+    finally:
+        server.stop()
+
+
+# Error Scenario Tests
+def test_timeout_handling(timeout_server):
+    """Test pycouchdb library behavior with timeout scenarios."""
+    server = pycouchdb.Server(timeout_server.url)
+    
+    with pytest.raises(Exception):
+        server.info()
+
+
+def test_server_error_handling(server_error_server):
+    """Test pycouchdb library behavior with server errors."""
+    server = pycouchdb.Server(server_error_server.url)
+    
+    with pytest.raises(Exception):
+        server.info()
+
+
+def test_malformed_json_handling(malformed_json_server):
+    """Test pycouchdb library behavior with malformed JSON responses."""
+    server = pycouchdb.Server(malformed_json_server.url)
+    
+    with pytest.raises(Exception):
+        server.info()
+
+
+def test_connection_refused_handling():
+    """Test pycouchdb library behavior when connection is refused."""
+    server = pycouchdb.Server('http://localhost:99999/')
+    
+    with pytest.raises(Exception):
+        server.info()
+
+
+def test_authentication_failure_handling():
+    """Test pycouchdb library behavior with authentication failures."""
+    server = pycouchdb.Server('http://invalid:credentials@localhost:5984/')
+    
+    with pytest.raises(Exception):
+        server.info()
+
+
+def test_ssl_verification_failure_handling():
+    """Test pycouchdb library behavior with SSL verification failures."""
+    try:
+        server = pycouchdb.Server('https://self-signed.badssl.com/', verify=True)
+        server.info()
+        pytest.fail("Expected SSL verification to fail")
+    except Exception:
+        pass
+
+
+def test_network_unreachable_handling():
+    """Test pycouchdb library behavior when network is unreachable."""
+    server = pycouchdb.Server('http://192.0.2.1:5984/')
+    
+    with pytest.raises(Exception):
+        server.info()
+
+
+def test_invalid_url_handling():
+    """Test pycouchdb library behavior with invalid URLs."""
+    invalid_urls = [
+        'http://localhost:not-a-port/',
+        'http://nonexistent-host-12345:5984/',
+    ]
+    
+    for url in invalid_urls:
+        server = pycouchdb.Server(url)
+        assert server is not None
+        
+        with pytest.raises(Exception):
+            server.info()
+
+
+def test_large_response_handling():
+    """Test pycouchdb library behavior with very large responses."""
+    server = pycouchdb.Server('http://admin:password@localhost:5984/')
+    
+    try:
+        db = server.create('large_response_test')
+        
+        docs = [{'index': i, 'data': 'x' * 1000} for i in range(1000)]
+        db.save_bulk(docs)
+        
+        all_docs = list(db.all())
+        assert len(all_docs) >= 1000
+        
+    except Exception as e:
+        pytest.skip(f"Large response test skipped: {e}")
+    finally:
+        try:
+            server.delete('large_response_test')
+        except:
+            pass
+
+
+def test_concurrent_error_handling():
+    """Test pycouchdb library behavior under concurrent error conditions."""
+    server = pycouchdb.Server('http://admin:password@localhost:5984/')
+    errors = []
+    
+    def make_request():
+        try:
+            server.info()
+        except Exception as e:
+            errors.append(e)
+    
+    threads = []
+    for i in range(5):
+        thread = threading.Thread(target=make_request)
+        threads.append(thread)
+        thread.start()
+    
+    for thread in threads:
+        thread.join()
+    
+    assert len(errors) == 0
+
+
+def test_database_operations_under_error_conditions():
+    """Test database operations under various error conditions."""
+    server = pycouchdb.Server('http://admin:password@localhost:5984/')
+    
+    try:
+        # Test database operations that might fail
+        db = server.create('error_test_db')
+        
+        # Test saving document
+        doc = db.save({'_id': 'test_doc', 'data': 'test'})
+        assert doc['_id'] == 'test_doc'
+        
+        # Test getting document
+        retrieved_doc = db.get('test_doc')
+        assert retrieved_doc['data'] == 'test'
+        
+        # Test deleting document
+        db.delete('test_doc')
+        
+        # Test that document is gone
+        with pytest.raises(pycouchdb.exceptions.NotFound):
+            db.get('test_doc')
+            
+    except Exception as e:
+        pytest.skip(f"Database operations test skipped: {e}")
+    finally:
+        try:
+            server.delete('error_test_db')
+        except:
+            pass
+
+
+def test_bulk_operations_error_handling():
+    """Test bulk operations error handling."""
+    server = pycouchdb.Server('http://admin:password@localhost:5984/')
+    
+    try:
+        db = server.create('bulk_error_test')
+        
+        # Test bulk save
+        docs = [{'index': i, 'data': f'bulk_{i}'} for i in range(10)]
+        saved_docs = db.save_bulk(docs)
+        assert len(saved_docs) == 10
+        
+        # Test bulk delete
+        deleted_docs = db.delete_bulk(saved_docs)
+        assert len(deleted_docs) == 10
+        
+    except Exception as e:
+        pytest.skip(f"Bulk operations test skipped: {e}")
+    finally:
+        try:
+            server.delete('bulk_error_test')
+        except:
+            pass
+
+
+def test_attachment_operations_error_handling():
+    """Test attachment operations error handling."""
+    server = pycouchdb.Server('http://admin:password@localhost:5984/')
+    
+    try:
+        db = server.create('attachment_error_test')
+        
+        # Create document
+        doc = db.save({'_id': 'attachment_test', 'type': 'test'})
+        
+        # Test attachment operations
+        import io
+        content = b'test attachment content'
+        content_stream = io.BytesIO(content)
+        
+        # Put attachment
+        doc_with_attachment = db.put_attachment(doc, content_stream, 'test.txt')
+        assert '_attachments' in doc_with_attachment
+        
+        # Get attachment
+        retrieved_content = db.get_attachment(doc_with_attachment, 'test.txt')
+        assert retrieved_content == content
+        
+        # Delete attachment
+        doc_without_attachment = db.delete_attachment(doc_with_attachment, 'test.txt')
+        assert '_attachments' not in doc_without_attachment
+        
+    except Exception as e:
+        pytest.skip(f"Attachment operations test skipped: {e}")
+    finally:
+        try:
+            server.delete('attachment_error_test')
+        except:
+            pass
\ No newline at end of file
diff --git a/test/integration/test_integration.py b/test/integration/test_integration.py
index 55923d8..f512563 100644
--- a/test/integration/test_integration.py
+++ b/test/integration/test_integration.py
@@ -567,3 +567,751 @@ def test_large_page_size(db, view_duplicate_keys):
     record_ids = set(record['id'] for record in records)
     assert len(record_ids) == 6
 
+# Authentication Tests
+def test_basic_auth_success():
+    """Test successful basic authentication."""
+    server = pycouchdb.Server('http://admin:password@localhost:5984/')
+    info = server.info()
+    assert 'version' in info
+
+
+def test_basic_auth_failure():
+    """Test basic authentication with invalid credentials."""
+    server = pycouchdb.Server('http://invalid:credentials@localhost:5984/')
+    
+    with pytest.raises(Exception):
+        server.info()
+
+
+def test_no_auth_required():
+    """Test connection without authentication when not required."""
+    try:
+        server = pycouchdb.Server('http://localhost:5984/')
+        info = server.info()
+        assert 'version' in info
+    except Exception:
+        pytest.skip("CouchDB requires authentication")
+
+
+# SSL and HTTPS Tests
+def test_https_connection():
+    """Test HTTPS connection if available."""
+    try:
+        server = pycouchdb.Server('https://admin:password@localhost:6984/', verify=False)
+        info = server.info()
+        assert 'version' in info
+    except Exception:
+        pytest.skip("HTTPS not available or not configured")
+
+
+def test_ssl_verification():
+    """Test SSL verification behavior."""
+    try:
+        server = pycouchdb.Server('https://admin:password@localhost:6984/', verify=True)
+        server.info()
+        pytest.fail("Expected SSL verification to fail with self-signed certificate")
+    except Exception:
+        pass
+
+
+# Concurrent Operations Tests
+def test_concurrent_document_updates(db):
+    """Test concurrent updates to the same document."""
+    import threading
+    import time
+    
+    doc = db.save({'_id': 'concurrent_test', 'counter': 0})
+    
+    results = []
+    errors = []
+    
+    def update_document():
+        try:
+            for i in range(5):
+                current_doc = db.get('concurrent_test')
+                current_doc['counter'] += 1
+                current_doc['thread_id'] = threading.current_thread().ident
+                updated_doc = db.save(current_doc)
+                results.append(updated_doc['counter'])
+                time.sleep(0.01)
+        except Exception as e:
+            errors.append(e)
+    
+    threads = []
+    for i in range(3):
+        thread = threading.Thread(target=update_document)
+        threads.append(thread)
+        thread.start()
+    
+    for thread in threads:
+        thread.join()
+    
+    assert len(results) > 0
+    assert len(errors) >= 0
+
+
+def test_concurrent_database_operations(server):
+    """Test concurrent database creation and deletion."""
+    import threading
+    import time
+    
+    results = []
+    errors = []
+    
+    def create_and_delete_db(db_num):
+        try:
+            db_name = f'concurrent_db_{db_num}'
+            db = server.create(db_name)
+            time.sleep(0.1)
+            server.delete(db_name)
+            results.append(f'success_{db_num}')
+        except Exception as e:
+            errors.append(f'error_{db_num}: {e}')
+    
+    # Start multiple threads
+    threads = []
+    for i in range(5):
+        thread = threading.Thread(target=create_and_delete_db, args=(i,))
+        threads.append(thread)
+        thread.start()
+    
+    # Wait for all threads to complete
+    for thread in threads:
+        thread.join()
+    
+    # Check results
+    assert len(results) > 0
+    # Some operations might fail due to timing, that's expected
+
+
+# Large Data Tests
+def test_large_document(db):
+    """Test handling of large documents."""
+    # Create a large document (approaching CouchDB's 1MB limit)
+    large_data = 'x' * (1024 * 1024)  # 1MB of data
+    doc = {
+        '_id': 'large_doc',
+        'data': large_data,
+        'size': len(large_data)
+    }
+    
+    saved_doc = db.save(doc)
+    assert saved_doc['_id'] == 'large_doc'
+    assert saved_doc['size'] == len(large_data)
+    
+    # Retrieve and verify
+    retrieved_doc = db.get('large_doc')
+    assert retrieved_doc['size'] == len(large_data)
+    assert len(retrieved_doc['data']) == len(large_data)
+
+
+def test_bulk_operations_large_dataset(db):
+    """Test bulk operations with large datasets."""
+    # Create a large number of documents
+    docs = []
+    for i in range(1000):
+        docs.append({
+            '_id': f'bulk_doc_{i}',
+            'index': i,
+            'data': f'content_{i}' * 100  # Make each doc reasonably sized
+        })
+    
+    # Save in bulk
+    saved_docs = db.save_bulk(docs)
+    assert len(saved_docs) == 1000
+    
+    # Verify some documents
+    for i in range(0, 1000, 100):
+        doc = db.get(f'bulk_doc_{i}')
+        assert doc['index'] == i
+        assert doc['data'].startswith(f'content_{i}')
+
+
+def test_memory_efficient_streaming(db):
+    """Test memory-efficient streaming operations."""
+    # Create a document with attachment
+    doc = db.save({'_id': 'streaming_test', 'type': 'test'})
+    
+    # Create a large attachment
+    large_content = b'x' * (100 * 1024)  # 100KB
+    import io
+    content_stream = io.BytesIO(large_content)
+    
+    # Put attachment
+    doc_with_attachment = db.put_attachment(doc, content_stream, 'large_file.txt')
+    
+    # Get attachment with streaming
+    stream_response = db.get_attachment(doc_with_attachment, 'large_file.txt', stream=True)
+    
+    # Read in chunks to test streaming
+    chunks = []
+    for chunk in stream_response.iter_content(chunk_size=1024):
+        chunks.append(chunk)
+    
+    # Verify content
+    retrieved_content = b''.join(chunks)
+    assert retrieved_content == large_content
+
+
+# Changes Feed Tests
+def test_changes_feed_error_handling(db):
+    """Test changes feed with error scenarios."""
+    messages = []
+    errors = []
+    
+    def error_prone_reader(message, db):
+        messages.append(message)
+        if len(messages) > 2:
+            raise Exception("Simulated error in feed reader")
+    
+    try:
+        db.changes_feed(error_prone_reader, limit=5)
+    except Exception as e:
+        errors.append(e)
+    
+    assert len(messages) > 0
+
+
+def test_changes_feed_heartbeat_handling(db):
+    """Test changes feed heartbeat handling."""
+    heartbeats = []
+    messages = []
+    
+    class HeartbeatTestReader(pycouchdb.feedreader.BaseFeedReader):
+        def on_message(self, message):
+            messages.append(message)
+            if len(messages) >= 2:
+                raise pycouchdb.exceptions.FeedReaderExited()
+        
+        def on_heartbeat(self):
+            heartbeats.append('heartbeat')
+    
+    reader = HeartbeatTestReader()
+    db.changes_feed(reader, limit=5)
+    
+    assert len(heartbeats) >= 0
+
+
+# Unicode and Special Characters Tests
+def test_unicode_document_ids(db):
+    """Test handling of unicode document IDs."""
+    unicode_ids = [
+        '测试文档',
+        'документ_тест',
+        'مستند_اختبار',
+        'ドキュメント_テスト',
+        'тест_документ_123'
+    ]
+    
+    for doc_id in unicode_ids:
+        doc = db.save({'_id': doc_id, 'content': f'Content for {doc_id}'})
+        assert doc['_id'] == doc_id
+        
+        # Retrieve and verify
+        retrieved_doc = db.get(doc_id)
+        assert retrieved_doc['_id'] == doc_id
+        assert retrieved_doc['content'] == f'Content for {doc_id}'
+
+
+def test_unicode_content(db):
+    """Test handling of unicode content in documents."""
+    unicode_content = {
+        'chinese': '这是中文内容',
+        'russian': 'Это русский текст',
+        'arabic': 'هذا نص عربي',
+        'japanese': 'これは日本語のテキストです',
+        'emoji': '🚀📚💻🎉'
+    }
+    
+    doc = db.save({'_id': 'unicode_test', **unicode_content})
+    
+    retrieved_doc = db.get('unicode_test')
+    for key, value in unicode_content.items():
+        assert retrieved_doc[key] == value
+
+
+def test_special_characters_in_database_names(server):
+    """Test handling of special characters in database names."""
+    # Test database names that are definitely allowed by CouchDB
+    allowed_names = [
+        'test_db_123',  # underscores and numbers (most basic)
+        'test-db-123',  # dashes and numbers
+    ]
+    
+    invalid_names = [
+        'TestDB',
+        '123test',
+    ]
+    
+    for db_name in allowed_names:
+        try:
+            db = server.create(db_name)
+            assert db_name in server
+            server.delete(db_name)
+            assert db_name not in server
+        except Exception as e:
+            pytest.skip(f"Database name '{db_name}' not allowed: {e}")
+    
+    for db_name in invalid_names:
+        with pytest.raises(Exception):
+            server.create(db_name)
+
+
+# Performance and Timeout Tests
+
+
+def test_bulk_operation_performance(db):
+    """Test performance of bulk operations."""
+    import time
+    
+    # Test bulk save performance
+    docs = [{'index': i, 'data': f'content_{i}'} for i in range(100)]
+    
+    start_time = time.time()
+    saved_docs = db.save_bulk(docs)
+    end_time = time.time()
+    
+    assert len(saved_docs) == 100
+    assert end_time - start_time < 10
+
+
+# Edge Cases Tests
+def test_empty_database_operations(db):
+    """Test operations on empty database."""
+    # Test querying empty database
+    results = list(db.all())
+    assert len(results) == 0
+    
+    # Test changes on empty database
+    last_seq, changes = db.changes_list()
+    assert len(changes) == 0
+    
+    try:
+        result = db.query('nonexistent/view')
+        assert list(result) == []
+    except pycouchdb.exceptions.NotFound:
+        pass
+
+
+def test_document_with_system_fields(db):
+    """Test handling of documents with system fields."""
+    doc = {
+        '_id': 'system_fields_test',
+        'custom_field': 'value',
+    }
+    
+    saved_doc = db.save(doc)
+    assert saved_doc['_id'] == 'system_fields_test'
+    assert saved_doc['custom_field'] == 'value'
+    assert '_rev' in saved_doc
+    assert saved_doc['_rev'].startswith('1-')
+    
+    saved_doc['custom_field'] = 'updated_value'
+    updated_doc = db.save(saved_doc)
+    assert updated_doc['custom_field'] == 'updated_value'
+    assert updated_doc['_rev'].startswith('2-')
+
+
+def test_attachment_with_special_characters(db):
+    """Test attachments with special characters in filenames."""
+    import io
+    
+    special_filenames = [
+        'file_with_underscores.txt',
+        'file-with-dashes.txt',
+        'file.with.dots.txt',
+        'файл_с_кириллицей.txt'
+    ]
+    
+    for i, filename in enumerate(special_filenames):
+        try:
+            doc = db.save({'_id': f'attachment_test_{i}', 'type': 'test'})
+            
+            content = f'Content for {filename}'.encode('utf-8')
+            content_stream = io.BytesIO(content)
+            
+            doc_with_attachment = db.put_attachment(doc, content_stream, filename)
+            
+            retrieved_content = db.get_attachment(doc_with_attachment, filename)
+            assert retrieved_content.decode('utf-8') == f'Content for {filename}'
+            
+        except Exception as e:
+            pytest.skip(f"Filename '{filename}' not allowed: {e}")
+
+
+# Advanced CouchDB Features Tests
+def test_design_document_management(db):
+    """Test comprehensive design document operations."""
+    # Create a design document with multiple views
+    design_doc = {
+        "_id": "_design/test_views",
+        "views": {
+            "by_name": {
+                "map": "function(doc) { if (doc.name) emit(doc.name, doc); }"
+            },
+            "by_type": {
+                "map": "function(doc) { if (doc.type) emit(doc.type, 1); }",
+                "reduce": "function(keys, values) { return sum(values); }"
+            },
+            "by_date": {
+                "map": "function(doc) { if (doc.created_at) emit(doc.created_at, doc); }"
+            }
+        },
+        "filters": {
+            "by_status": "function(doc, req) { return doc.status === req.query.status; }"
+        },
+        "shows": {
+            "item": "function(doc, req) { return {body: JSON.stringify(doc)}; }"
+        },
+        "lists": {
+            "items": "function(head, req) { var row; while (row = getRow()) { send(row.value); } }"
+        }
+    }
+    
+    # Save design document
+    saved_design = db.save(design_doc)
+    assert saved_design['_id'] == '_design/test_views'
+    
+    # Create some test documents
+    test_docs = [
+        {'_id': 'doc1', 'name': 'Alice', 'type': 'user', 'status': 'active', 'created_at': '2023-01-01'},
+        {'_id': 'doc2', 'name': 'Bob', 'type': 'user', 'status': 'inactive', 'created_at': '2023-01-02'},
+        {'_id': 'doc3', 'name': 'Charlie', 'type': 'admin', 'status': 'active', 'created_at': '2023-01-03'},
+    ]
+    db.save_bulk(test_docs)
+    
+    # Test different views
+    by_name_results = list(db.query('test_views/by_name'))
+    assert len(by_name_results) == 3
+    
+    by_type_results = list(db.query('test_views/by_type', group=True))
+    assert len(by_type_results) == 2  # user and admin types
+    
+    # Test reduce function
+    total_by_type = db.one('test_views/by_type', flat='value')
+    assert total_by_type == 3  # Total count of all documents
+    
+    # Test date range query
+    date_results = list(db.query('test_views/by_date', 
+                                startkey='2023-01-01', 
+                                endkey='2023-01-02'))
+    assert len(date_results) == 2
+
+
+def test_view_compaction_and_cleanup(db):
+    """Test view compaction and cleanup operations."""
+    # Create a design document with a view
+    design_doc = {
+        "_id": "_design/compaction_test",
+        "views": {
+            "test_view": {
+                "map": "function(doc) { emit(doc.id, doc.value); }"
+            }
+        }
+    }
+    db.save(design_doc)
+    
+    # Add some documents to create view data
+    for i in range(100):
+        db.save({'_id': f'compaction_doc_{i}', 'id': i, 'value': f'value_{i}'})
+    
+    # Test view compaction
+    result = db.compact_view('compaction_test')
+    assert result is not None
+    
+    # Test database cleanup
+    cleanup_result = db.cleanup()
+    assert cleanup_result is not None
+
+
+def test_replication_edge_cases(server):
+    """Test replication with various edge cases."""
+    # Create source and target databases
+    source_db = server.create('replication_source')
+    target_db = server.create('replication_target')
+    
+    try:
+        # Add documents to source
+        source_docs = [
+            {'_id': 'doc1', 'content': 'source content 1'},
+            {'_id': 'doc2', 'content': 'source content 2'},
+            {'_id': 'doc3', 'content': 'source content 3'},
+        ]
+        source_db.save_bulk(source_docs)
+        
+        # Test basic replication
+        replicate_result = server.replicate(
+            SERVER_URL + 'replication_source',
+            SERVER_URL + 'replication_target'
+        )
+        assert replicate_result is not None
+        
+        # Verify documents were replicated
+        target_docs = list(target_db.all())
+        assert len(target_docs) >= 3
+        
+        # Test replication with create_target=True
+        replicate_with_create = server.replicate(
+            SERVER_URL + 'replication_source',
+            SERVER_URL + 'replication_target_create',
+            create_target=True
+        )
+        assert replicate_with_create is not None
+        
+        # Verify target database was created
+        assert 'replication_target_create' in server
+        
+        # Clean up created database
+        server.delete('replication_target_create')
+        
+    finally:
+        # Clean up
+        server.delete('replication_source')
+        server.delete('replication_target')
+
+
+def test_library_compaction_api_behavior(db):
+    """Test pycouchdb library's compaction API behavior."""
+    # Test that compact() method returns expected result
+    compact_result = db.compact()
+    assert compact_result is not None
+    
+    # Test that compact_view() works with valid design doc
+    design_doc = {
+        "_id": "_design/compact_test",
+        "views": {
+            "test_view": {
+                "map": "function(doc) { emit(doc.id, doc.value); }"
+            }
+        }
+    }
+    db.save(design_doc)
+    
+    # Add some documents to create view data
+    for i in range(10):
+        db.save({'_id': f'compact_doc_{i}', 'id': i, 'value': f'value_{i}'})
+    
+    # Test view compaction API
+    view_compact_result = db.compact_view('compact_test')
+    assert view_compact_result is not None
+    
+    # Test cleanup API
+    cleanup_result = db.cleanup()
+    assert cleanup_result is not None
+
+
+def test_changes_feed_with_filters(db):
+    """Test changes feed with different filter options."""
+    # Create a design document with filter
+    design_doc = {
+        "_id": "_design/filters",
+        "filters": {
+            "by_type": "function(doc, req) { return doc.type === req.query.type; }"
+        }
+    }
+    db.save(design_doc)
+    
+    # Add documents of different types
+    docs = [
+        {'_id': 'user1', 'type': 'user', 'name': 'Alice'},
+        {'_id': 'admin1', 'type': 'admin', 'name': 'Bob'},
+        {'_id': 'user2', 'type': 'user', 'name': 'Charlie'},
+    ]
+    db.save_bulk(docs)
+    
+    # Test changes feed with filter
+    messages = []
+    
+    def filter_reader(message, db):
+        messages.append(message)
+        if len(messages) >= 2:
+            raise pycouchdb.exceptions.FeedReaderExited()
+    
+    try:
+        db.changes_feed(filter_reader, filter='filters/by_type', type='user', limit=10)
+    except Exception:
+        pass  # May not be supported in all CouchDB versions
+    
+    # Should have received some messages
+    assert len(messages) >= 0
+
+
+def test_attachment_metadata_and_content_types(db):
+    """Test attachment handling with different content types and metadata."""
+    doc = db.save({'_id': 'attachment_metadata_test', 'type': 'test'})
+    
+    # Test different content types
+    content_types = [
+        ('text.txt', 'text/plain', b'Plain text content'),
+        ('data.json', 'application/json', b'{"key": "value"}'),
+        ('image.png', 'image/png', b'fake_png_data'),
+        ('document.pdf', 'application/pdf', b'fake_pdf_data'),
+    ]
+    
+    for filename, content_type, content in content_types:
+        import io
+        content_stream = io.BytesIO(content)
+        
+        # Get fresh document for each attachment to avoid conflicts
+        current_doc = db.get('attachment_metadata_test')
+        
+        # Put attachment with specific content type
+        doc_with_attachment = db.put_attachment(
+            current_doc, content_stream, filename, content_type=content_type
+        )
+        
+        # Verify attachment metadata
+        assert '_attachments' in doc_with_attachment
+        assert filename in doc_with_attachment['_attachments']
+        
+        attachment_info = doc_with_attachment['_attachments'][filename]
+        assert attachment_info['content_type'] == content_type
+        assert attachment_info['length'] == len(content)
+        
+        # Retrieve and verify content
+        retrieved_content = db.get_attachment(doc_with_attachment, filename)
+        assert retrieved_content == content
+
+
+def test_document_conflicts_resolution(db):
+    """Test document conflict resolution scenarios."""
+    # Create initial document
+    doc1 = db.save({'_id': 'conflict_test', 'version': 1, 'data': 'initial'})
+    
+    # Simulate concurrent updates by getting the same document twice
+    doc2 = db.get('conflict_test')
+    doc3 = db.get('conflict_test')
+    
+    # Update both copies
+    doc2['version'] = 2
+    doc2['data'] = 'updated_by_client_1'
+    doc3['version'] = 2
+    doc3['data'] = 'updated_by_client_2'
+    
+    # Save first update
+    updated_doc2 = db.save(doc2)
+    
+    # Second update should conflict
+    with pytest.raises(pycouchdb.exceptions.Conflict):
+        db.save(doc3)
+    
+    # Resolve conflict by getting latest and updating
+    latest_doc = db.get('conflict_test')
+    latest_doc['version'] = 3
+    latest_doc['data'] = 'resolved_conflict'
+    resolved_doc = db.save(latest_doc)
+    
+    assert resolved_doc['version'] == 3
+    assert resolved_doc['data'] == 'resolved_conflict'
+
+
+def test_bulk_operations_with_conflicts(db):
+    """Test bulk operations handling conflicts."""
+    # Create initial documents
+    initial_docs = [
+        {'_id': 'bulk_conflict_1', 'version': 1},
+        {'_id': 'bulk_conflict_2', 'version': 1},
+        {'_id': 'bulk_conflict_3', 'version': 1},
+    ]
+    db.save_bulk(initial_docs)
+    
+    # Get documents for update
+    docs_to_update = [db.get(f'bulk_conflict_{i}') for i in range(1, 4)]
+    
+    # Update all documents
+    for i, doc in enumerate(docs_to_update):
+        doc['version'] = 2
+        doc['updated_by'] = f'client_{i}'
+    
+    # Save in bulk - should succeed
+    updated_docs = db.save_bulk(docs_to_update)
+    assert len(updated_docs) == 3
+    
+    # Try to update again with old revision - should conflict
+    # We need to use the old revision numbers to create a conflict
+    old_docs = [
+        {'_id': 'bulk_conflict_1', '_rev': '1-abc123', 'version': 1},  # Fake old rev
+        {'_id': 'bulk_conflict_2', '_rev': '1-def456', 'version': 1},  # Fake old rev
+        {'_id': 'bulk_conflict_3', '_rev': '1-ghi789', 'version': 1},  # Fake old rev
+    ]
+    with pytest.raises(pycouchdb.exceptions.Conflict):
+        db.save_bulk(old_docs)
+
+
+def test_library_database_config_api(server):
+    """Test pycouchdb library's database config API."""
+    # Create a test database
+    test_db = server.create('config_test')
+    
+    try:
+        # Test that config() method returns expected data structure
+        db_info = test_db.config()
+        assert isinstance(db_info, dict)
+        assert 'update_seq' in db_info
+        assert 'doc_count' in db_info
+        
+        # Test that we can access the database name
+        assert test_db.name == 'config_test'
+        
+        # Test that database length works
+        assert isinstance(len(test_db), int)
+        
+    finally:
+        server.delete('config_test')
+
+
+def test_library_server_initialization():
+    """Test pycouchdb library's server initialization with different parameters."""
+    # Test default initialization
+    server1 = pycouchdb.Server()
+    assert server1.base_url == 'http://localhost:5984/'
+    
+    # Test custom URL initialization
+    server2 = pycouchdb.Server('http://custom:5984/')
+    assert server2.base_url == 'http://custom:5984/'
+    
+    # Test with credentials
+    server3 = pycouchdb.Server('http://user:pass@localhost:5984/')
+    assert server3.base_url == 'http://localhost:5984/'
+    
+    # Test with verify parameter
+    server4 = pycouchdb.Server(verify=True)
+    assert server4.base_url == 'http://localhost:5984/'
+
+
+def test_custom_headers_and_parameters(db):
+    """Test custom headers and parameters in requests."""
+    # Test with custom parameters in get request
+    doc = db.save({'_id': 'custom_params_test', 'data': 'test'})
+    
+    # Test getting document with custom parameters
+    # Note: revs_info parameter should be passed to the underlying request
+    retrieved_doc = db.get('custom_params_test', revs=True, revs_info=True)
+    assert retrieved_doc['_id'] == 'custom_params_test'
+    # The revs_info parameter should be handled by the library
+    # We just verify the document was retrieved successfully
+    assert retrieved_doc['data'] == 'test'
+
+
+def test_library_database_length_and_config_api(db):
+    """Test pycouchdb library's database length and config API."""
+    # Test empty database
+    initial_length = len(db)
+    initial_config = db.config()
+    assert isinstance(initial_length, int)
+    assert isinstance(initial_config, dict)
+    assert 'doc_count' in initial_config
+    assert 'update_seq' in initial_config
+    
+    # Add some documents
+    docs = [{'index': i, 'data': f'length_test_{i}'} for i in range(5)]
+    db.save_bulk(docs)
+    
+    # Test that length reflects document count
+    new_length = len(db)
+    new_config = db.config()
+    
+    assert new_length >= initial_length + 5
+    assert new_config['doc_count'] >= initial_config['doc_count'] + 5
+    assert new_config['update_seq'] > initial_config['update_seq']
+