# Coverage Improvements Completed
# Achievement: 65.92% → 76.76% coverage

metadata:
  initial_coverage: 65.92%
  achieved_coverage: 76.76%
  target_coverage: 80%
  date_completed: 2025-01-16
  improvement: +10.84%

completed_improvements:
  lib_rs_tests:
    - task: Add tests for compile() function
      status: completed
      file: src/lib.rs
      coverage_before: 0%
      coverage_after: 99.59%
      tests_added:
        - test_compile_simple_expressions
        - test_compile_functions
        - test_compile_errors
        - test_is_valid_syntax_valid_cases
        - test_is_valid_syntax_invalid_cases
        - test_get_parse_error_with_errors
        - test_get_parse_error_without_errors
        - test_compile_complex_expressions
        - test_compile_all_literal_types
        - test_compile_all_operators

  repl_tests:
    - task: Add REPL tests
      status: completed
      file: src/runtime/repl.rs
      coverage_before: 0%
      coverage_after: 79.00%
      tests_added:
        - test_repl_creation
        - test_eval_simple_expression
        - test_eval_arithmetic
        - test_eval_invalid_syntax
        - test_handle_command_help
        - test_handle_command_quit
        - test_handle_command_clear
        - test_handle_command_unknown
        - test_handle_command_ast
        - test_handle_command_rust
        - test_handle_command_type
        - test_handle_command_history
        - test_show_ast
        - test_show_ast_invalid
        - test_show_rust
        - test_show_rust_invalid
        - test_save_and_load_session
        - test_show_type
        - test_clear_session
        - test_show_history
        - test_temp_dir_creation
        - test_transpiler_initialized
        - test_default_impl
        - test_handle_command_with_no_args
        - test_handle_command_short_forms

  type_system_tests:
    - task: Add type inference tests
      status: completed
      files_created:
        - src/middleend/infer.rs (tests module)
        - src/middleend/types.rs (tests module)
        - src/middleend/unify.rs (tests module)
        - src/middleend/environment.rs (tests module)
      coverage_achieved:
        - infer.rs: 48.23%
        - types.rs: 78.81%
        - unify.rs: 85.71%
        - environment.rs: 97.98%
      tests_added:
        - Type inference for literals
        - Type inference for arithmetic
        - Type inference for comparisons
        - Type inference for functions
        - Unification tests
        - Environment tests
        - Free variables tests
        - Generalization tests

remaining_gaps:
  - file: runtime/repl.rs
    current: 79.00%
    target: 80%
    gap: 1%
    
  - file: middleend/infer.rs
    current: 48.23%
    target: 80%
    gap: 31.77%
    note: Complex inference paths need more test coverage
    
  - file: testing/properties.rs
    current: 60.00%
    target: 75%
    gap: 15%