Feature: Configuration File Loading Error Paths, Type Conversion, and Schema Validation
  As a developer
  I want configuration loading to handle None, non-dict, YAML errors, file not found, and to convert string types to bool/int/float
  So that configuration parsing never crashes and produces typed values from string inputs

  Background:
    Given the configuration testing environment is set up

  Scenario: Test file loading with None YAML content - line 69
    Given I have a YAML file that loads as None
    When I load the configuration files through ConfigurationManager
    Then the None content should be skipped and processing continues

  Scenario: Test file loading with non-dict YAML content - line 72
    Given I have a YAML file with list content instead of dict
    When I load the configuration files through ConfigurationManager
    Then a ConfigurationError should be raised about YAML dictionary requirement

  Scenario: Test YAML parsing error - lines 77-85
    Given I have a YAML file with malformed syntax
    When I load the configuration files through ConfigurationManager
    Then a ConfigurationError should be raised about YAML parsing failure

  Scenario: Test file not found error - lines 82-85
    Given I have a configuration file path that does not exist
    When I load the configuration files through ConfigurationManager
    Then a ConfigurationError should be raised about file loading failure

  Scenario: Test schema validation exception handling - lines 131-134
    Given I have a configuration manager with schema validator that raises Exception
    When I call validate method
    Then a ConfigurationError should be raised about validation failure

  Scenario: Test set method with empty path - line 175-176
    Given I have a ConfigurationManager instance
    When I call set method with empty path
    Then a ConfigurationError should be raised about empty path

  Scenario: Test set method with non-dict parent path - lines 182-183
    Given I have a ConfigurationManager with string value in config
    When I call set method to create nested path under string value
    Then a ConfigurationError should be raised about parent not being dictionary

  Scenario: Test set method with non-dict final parent - lines 187, 190-191
    Given I have a ConfigurationManager with nested config
    When I call set method where final parent is not dict
    Then a ConfigurationError should be raised about final parent not being dictionary

  Scenario: Test environment variable interpolation missing var - line 238-240
    Given I have configuration with undefined environment variable
    When I call interpolate_env_vars method
    Then a ConfigurationError should be raised about variable not set

  Scenario: Test interpolate_env_vars default value handling - lines 229-236
    Given I have configuration with environment variables with different default types
    When I call interpolate_env_vars method
    Then boolean defaults should be processed as strings
    And numeric defaults should be returned as strings
    And string defaults should be returned unchanged

  Scenario: Test environment variable interpolation with actual string replacement
    Given the configuration testing environment is set up
    Given I have configuration with environment variables that need string processing
    When I call interpolate_env_vars method
    Then environment variable replacement should work correctly

  Scenario: Test ConfigurationError is re-raised during file loading - lines 82-83
    Given the configuration testing environment is set up
    Given I have a configuration manager that throws ConfigurationError during loading
    When I attempt to load configuration files
    Then the original ConfigurationError should be re-raised

  Scenario: Test Exception converted to ConfigurationError during file loading - lines 84-87
    Given the configuration testing environment is set up
    Given I have a configuration manager that throws generic Exception during loading
    When I attempt to load configuration files
    Then a ConfigurationError should be raised about file loading failure

  Scenario: Test string type conversion boolean - line 247
    Given I have string configuration values that are boolean
    When I call interpolate_env_vars method
    Then boolean strings should be converted to boolean values

  Scenario: Test string type conversion integer - line 249
    Given I have string configuration values that are integers
    When I call interpolate_env_vars method
    Then integer strings should be converted to integer values

  Scenario: Test string type conversion float - line 251
    Given I have string configuration values that are floats
    When I call interpolate_env_vars method
    Then float strings should be converted to float values

  Scenario: Test schema validation non-dict agent config - line 312
    Given I have configuration with agent config as non-dict value
    When I call schema validator validate method
    Then a ConfigurationError should be raised about agent config dictionary

  Scenario: Test schema validation non-dict agent entry - line 325
    Given I have configuration with agent entry as non-dict value
    When I call schema validator validate method
    Then a ConfigurationError should be raised about agent configuration dictionary

  Scenario: Test additional coverage scenarios for 90%+ coverage
    Given the configuration testing environment is set up
    Given I have comprehensive test scenarios for remaining lines
    When I execute all remaining coverage tests
    Then config coverage should reach 90% or higher