Ecm prep test refactor

[yingli-NREL]

Original State:

• Single file: tests/ecm_prep_test.py
• Size: 129,354 lines
• Framework: unittest
• Structure: Monolithic, all 15 test classes in one file

Final State:

• 15 separate test files, one per test class
• Total size: 3,670 lines. Overall reduction: 97.2%. Uses pickle method for dramatic size reduction.
• Framework: pytest
• Structure: Modular, organized, maintainable

pytest advantages

• More readable - Explicit fixture injection
• Better isolation - Clear data dependencies
• Easier debugging - Can inspect test_data fixture
• More maintainable - Clearer structure
• More flexible - Easy to add more fixtures

Major Directory Structure

tests/ecm_prep_test/
├── ...                     
├── archive/                               # Original 129K-line unittest file
│   └── ecm_prep_test_ORIGINAL.py      
│
├── data_generators/                       # Scripts to generate pickle files
│   ├── dump_merge_test_data.py           
│   ├── ...
│
├── test_data/                             # Pickle files with test data
│   ├── merge_measures_test_data.pkl      
│   ├── ...
│
└── Test files (pytest):  # 15 new test files
    ├── test_add_key_vals.py 
    ├── test_append_key_vals.py
    ├── test_check_markets.py
    ├── ...

Key Statistics:

Test Class	Original Lines	New Lines	Change	Method
YrMapTest	75	74	-1.3%	Inline
AppendKeyValsTest	120	118	-1.7%	Inline
CheckMarketsTest	80	112	+40.0%	Inline
DivKeyValsTest	92	126	+37.0%	Inline
DivKeyValsFloatTest	135	179	+32.6%	Inline
AddKeyValsTest	125	190	+52.0%	Inline
CreateKeyChainTest	211	226	+7.1%	Inline
FillParametersTest	564	574	+1.8%	Inline
CostConversionTest	573	591	+3.1%	Inline
CleanUpTest	200	250	+25.0%	Inline
MergeMeasuresTest	3,507	198	-94.4%	Pickle
PartitionMicrosegmentTest	3,880	188	-95.2%	Pickle
MarketUpdatesTest	19,401	478	-97.5%	Pickle
TimeSensitiveValuationTest	44,697	94	-99.8%	Pickle
UpdateMeasuresTest	55,694	272	-99.5%	Pickle