feat(extractor): Add DiscreteMaterialPlanExtractor class for batch data extraction

- Create DiscreteMaterialPlanExtractor class orchestrating web operations and post-processing
- Implement extract_and_process() combining download + Excel conversion
- Implement post_process_downloads() using ExcelConverter for merge
- Add extract_from_file() convenience function for file-based ID input
- Add component test file verifying class structure and methods
- Follow existing patterns: verbose logging, explicit parameters, English comments

tests/test_extractor_component.py

@@ -0,0 +1,120 @@
+"""
+Test DiscreteMaterialPlanExtractor component structure
+"""
+
+import sys
+from pathlib import Path
+
+# Add project root to Python path
+PROJECT_ROOT = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(PROJECT_ROOT))
+
+# Load environment variables
+from dotenv import load_dotenv
+load_dotenv(PROJECT_ROOT / ".env")
+
+# Configure browser path (not used in this test, but consistent with other tests)
+import os
+os.environ["PLAYWRIGHT_BROWSERS_PATH"] = os.getenv("PLAYWRIGHT_BROWSERS_PATH", "")
+
+print("=" * 60)
+print("Testing DiscreteMaterialPlanExtractor Component")
+print("=" * 60)
+
+try:
+    # Test 1: Import the component
+    print("\n[1/4] Importing DiscreteMaterialPlanExtractor...")
+    from utils.discrete_material_plan.extractor import (
+        DiscreteMaterialPlanExtractor,
+        extract_from_file
+    )
+    print("[OK] Import successful")
+
+    # Test 2: Verify class exists and has expected methods
+    print("\n[2/4] Verifying class structure...")
+    expected_methods = [
+        '__init__',
+        '_print',
+        '_cleanup_temp_files',
+        '_get_login_url',
+        '_chunk_order_ids',
+        '_download_batches',
+        'post_process_downloads',
+        'extract_and_process',
+        'extract_from_file'
+    ]
+    
+    missing_methods = []
+    for method in expected_methods:
+        if not hasattr(DiscreteMaterialPlanExtractor, method):
+            missing_methods.append(method)
+    
+    if missing_methods:
+        print(f"[FAIL] Missing methods: {missing_methods}")
+        raise AttributeError(f"Missing methods: {missing_methods}")
+    
+    print(f"[OK] All {len(expected_methods)} expected methods found")
+
+    # Test 3: Test instantiation with dummy parameters (no browser)
+    print("\n[3/4] Testing class instantiation...")
+    extractor = DiscreteMaterialPlanExtractor(
+        username="test_user",
+        password="test_password",
+        base_url="https://example.com",
+        headless=True,
+        ignore_https_errors=True,
+        verbose=True,
+        download_dir=None,
+        batch_size=10
+    )
+    
+    # Verify attributes are set correctly
+    assert extractor.username == "test_user", "Username not set correctly"
+    assert extractor.password == "test_password", "Password not set correctly"
+    assert extractor.base_url == "https://example.com", "Base URL not set correctly"
+    assert extractor.headless == True, "Headless not set correctly"
+    assert extractor.ignore_https_errors == True, "HTTPS errors setting not set correctly"
+    assert extractor.verbose == True, "Verbose not set correctly"
+    assert extractor.batch_size == 10, "Batch size not set correctly"
+    assert hasattr(extractor, 'download_dir'), "Download dir not set"
+    
+    print("[OK] Instantiation successful, all attributes verified")
+
+    # Test 4: Test helper methods
+    print("\n[4/4] Testing helper methods...")
+    
+    # Test _get_login_url
+    login_url = extractor._get_login_url()
+    expected_url = "https://example.com/yonbip/resources/uap/rbac/login/main/index.html"
+    assert login_url == expected_url, f"Login URL incorrect: {login_url}"
+    print(f"[OK] _get_login_url() returns: {login_url}")
+    
+    # Test _chunk_order_ids
+    test_ids = ["ID1", "ID2", "ID3", "ID4", "ID5"]
+    extractor.batch_size = 2
+    chunks = extractor._chunk_order_ids(test_ids)
+    expected_chunks = [["ID1", "ID2"], ["ID3", "ID4"], ["ID5"]]
+    assert chunks == expected_chunks, f"Chunking incorrect: {chunks}"
+    print(f"[OK] _chunk_order_ids() works correctly: {chunks}")
+    
+    # Test _print (should not raise)
+    extractor._print("Test message")
+    print("[OK] _print() works correctly")
+
+    # Cleanup
+    extractor._cleanup_temp_files()
+
+    print("\n" + "=" * 60)
+    print("[SUCCESS] All component tests passed!")
+    print("=" * 60)
+
+except Exception as e:
+    print(f"\n[ERROR] Component test failed!")
+    print(f"Error: {e}")
+    import traceback
+    traceback.print_exc()
+    sys.exit(1)
+
+print("\n" + "=" * 60)
+print("Test completed successfully")
+print("=" * 60)