Add test for ssl_password parameter

Add test_ssl_password_parameter test to verify ssl_password is properly
passed through to SSLConnection for encrypted private key support.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: majiayu000

tests/test_asyncio/test_ssl.py

@@ -141,3 +141,29 @@ def capture_context_create_default():
 
         finally:
             await r.aclose()
+
+    async def test_ssl_password_parameter(self, request):
+        """Test that ssl_password parameter is properly passed to SSLConnection"""
+        ssl_url = request.config.option.redis_ssl_url
+        parsed_url = urlparse(ssl_url)
+
+        # Test with a mock password for encrypted private key
+        test_password = "test_key_password"
+
+        r = redis.Redis(
+            host=parsed_url.hostname,
+            port=parsed_url.port,
+            ssl=True,
+            ssl_cert_reqs="none",
+            ssl_password=test_password,
+        )
+
+        try:
+            # Get the connection to verify ssl_password is passed through
+            conn = r.connection_pool.make_connection()
+            assert isinstance(conn, redis.SSLConnection)
+
+            # Verify the password is stored in the SSL context
+            assert conn.ssl_context.password == test_password
+        finally:
+            await r.aclose()