Review testing routines

[maxnutz]

Code Coverage Analysis: class_definitions.py

Total Coverage: ~66% (108 statements, 37 missing)

General Bug

• testing-batch in README does not work
• repair testing-batch in README to show current test-status on main.

Uncovered Methods and Branches

1. ENTIRELY UNCOVERED METHODS

_read_mappings() [Lines 132-140]

• Reason: Called only during __init__ (which is mocked in tests)
• What's missed:
  • Line 136: if not self.mappings_path.exists() - NEVER TESTED (FileNotFoundError branch)
  • The successful file reading path is indirectly tested but not directly verified

_read_pypsa_network_collection() [Lines 142-146]

• Reason: Called only during __init__ (which is mocked in tests)
• What's missed:
  • Line 145: The network file listing and filtering logic
  • Error handling when network directory doesn't exist

read_definitions() [Lines 148-162]

• Reason: Called only during __init__ (which is mocked in tests)
• What's missed:
  • Line 159: The actual nomenclature.DataStructureDefinition instantiation

_aggregate_to_country() [Lines 221-252]

• Reason: Only called indirectly through _select_aggregation_result()
• What's missed:
  • Lines 222-248: The logic when self.country == "all" - extracting 2-letter country codes
  • Lines 243-252: The logic when self.country is NOT "all" - filtering to specific country regions

_filter_to_regions() [Lines 254-297]

• Reason: Only called indirectly through _select_aggregation_result()
• What's missed:
  • Line 256: When self.country == "all" (returns result unchanged)
  • Lines 257-276: Filtering logic for specific country codes

_select_aggregation_result() [Lines 299-304]

• Reason: Called indirectly through _postprocess_statistics_result() but never directly
• What's missed:
  • Both branches: aggregation_level == "country" and aggregation_level == "region" are not sufficiently tested

_map_unit_level() [Lines 306-318]

• Reason: Called indirectly through _postprocess_statistics_result()
• What's missed:
  • Line 308: The pd.MultiIndex branch
  • Lines 312-314: The single index mapping logic

_postprocess_group_levels() [Lines 320-327]

• Reason: Called indirectly through _postprocess_statistics_result()
• What's missed:
  • All three branches for different aggregation level/country combinations

_postprocess_statistics_result() [Lines 329-370]

• Reason: Called within calculate_variables_values() but logic is not directly tested
• What's missed:
  • The entire method flow for different aggregation scenarios

structure_pyam_from_pandas() [Lines 372-433]

• Reason: Indirectly called, but key branches not exercised
• What's missed:
  • Line 381: Column renaming logic
  • Lines 386-409: Multi-country (with country == "all") vs single country branches
  • Lines 411-419: Region-level aggregation branch

_get_network_config() [Lines 435-464]

• Reason: Called in calculate_variables_values() but indirectly
• What's missed:
  • Line 439: The if matching_files: branch
  • Lines 440-442: Multiple config files warning path
  • Lines 443-453: Try-except block (success and error cases)
  • Lines 454-462: No config file warning path

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2. PARTIALLY UNCOVERED METHODS

__init__() [Lines 24-113] - ~70% coverage

Missing branches:

• Line 35-40: if network_results_path is None: - NOT TESTED (ValueError)
• Line 46-50: if not self.network_results_path.exists(): - NOT TESTED (FileNotFoundError)
• Line 52-56: if definitions_path is None: - NOT TESTED (ValueError)
• Line 62-66: if not self.definitions_path.exists(): - NOT TESTED (FileNotFoundError)
• Line 75-79: if self.model_name == None or self.scenario_name == None: - NOT TESTED (ValueError)
• Line 96-98: The else branch for if self.country == "all" (default path for specific country)

calculate_variables_values() [Lines 466-535] - ~50% coverage

Missing branches:

• Lines 491-495: Loop logic when results is empty (no results for a year)
• Lines 516-523: The if len(container_investment_years) > 0: and merge logic
  • Specifically: What happens when container_investment_years has 0 items?
  • What happens when container_investment_years has exactly 1 item?
• Lines 525-531: The else branch when aggregate_per_year == False
  • The timestamp year replacement logic

write_output_to_xlsx() [Lines 537-570] - ~70% coverage

Missing branches:

• Line 516: Error path when self.dsd_with_values is None - TESTED ✓
• Line 528-532: When self.country == "all" and aggregate_per_year == True
• Lines 534-535: When self.country == "all" and aggregate_per_year == False

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3. EDGE CASES NOT TESTED

1. Error handling in __init__() for missing config keys

   • network_results_path missing
   • definitions_path missing
   • model_name / scenario_name missing
   • Invalid aggregation_level values other than "country" and "region"
   • Invalid aggregate_per_year values (not a boolean)

2. Config file loading errors

   • YAML parsing errors in _read_config()
   • Missing mapping file in _read_mappings()
   • YAML parsing errors in _get_network_config()

3. _aggregate_to_country() with different country configurations

   • Country == "all" with multi-country locations
   • Single country filtering logic

4. calculate_variables_values() with edge cases

   • Zero investment years
   • Single investment year with multiple variables
   • Multiple investment years with merging

5. structure_pyam_from_pandas() branches

   • Region-level aggregation (aggregation_level == "region")
   • Country == "all" with country code mapping

6. write_output_to_xlsx() scenarios

   • aggregate_per_year == False with country == "all"
   • aggregate_per_year == False with specific country

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Summary: Top Priorities for Testing

Priority	Method	Lines	Issue
HIGH	__init__() error branches	35-79	Missing validation error tests
HIGH	calculate_variables_values()	491-531	Missing core calculation scenarios
HIGH	_aggregate_to_country()	222-252	Missing both country branches
MEDIUM	structure_pyam_from_pandas()	381-419	Missing aggregation branches
MEDIUM	_get_network_config()	439-462	Missing config loading branches
LOW	_map_unit_level()	308-318	Indirect coverage exists
LOW	_filter_to_regions()	256-276	Indirect coverage exists

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Key Recommendation

The highest-impact additions would be to:

1. Test __init__() with invalid/missing configuration values
2. Test calculate_variables_values() with multiple investment years and different aggregation modes
3. Test _aggregate_to_country() with both country=="all" and single-country scenarios
4. Add direct unit tests for _get_network_config() error handling