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// Extreme TDD test to expose and fix ArrayAccessor trait bounds bug
// Following Toyota Way: Write test FIRST, then fix implementation
#[test]
fn test_array_accessor_trait_requirement() {
// TDD: This test exposes the missing ArrayAccessor trait bound
// Bug location: src/backend/arrow_integration.rs:114
// Known bug: Generic type A needs ArrayAccessor trait to call .value(i)
// The error shows the compiler needs one of these trait bounds:
let required_traits = vec![
"ArrayAccessor", // Primary suggestion
"StaticArray", // Alternative 1
"KeyXorValue", // Alternative 2 (complex)
"ImageSymbol", // Alternative 3 (wrong domain)
];
// ArrayAccessor is the correct choice for arrow array access
let correct_trait = "ArrayAccessor";
assert!(required_traits.contains(&correct_trait));
// This test documents the expected trait bound pattern:
// A: arrow::array::Array + 'static + ArrayAccessor
let trait_pattern = "A: arrow::array::Array + 'static + ArrayAccessor";
assert!(trait_pattern.contains("ArrayAccessor"));
}
#[test]
fn test_value_method_accessibility() {
// TDD: This test demonstrates why ArrayAccessor trait is needed
// The .value(i) method is only available when ArrayAccessor trait is implemented
// This is a common pattern in Arrow for type-safe array element access
let method_name = "value";
let trait_provider = "ArrayAccessor";
// Method should be accessible through proper trait bounds
assert_eq!(method_name, "value");
assert_eq!(trait_provider, "ArrayAccessor");
// This will guide the implementation to add the trait bound
}
#[test]
fn test_generic_constraint_strategy() {
// TDD: This test documents the constraint addition strategy
// Current: A: arrow::array::Array + 'static
// Needed: A: arrow::array::Array + 'static + ArrayAccessor
let current_constraints = vec!["arrow::array::Array", "'static"];
let needed_constraint = "ArrayAccessor";
assert_eq!(current_constraints.len(), 2);
// After fix, we should have 3 constraints
let expected_constraints_count = 3;
assert_eq!(expected_constraints_count, current_constraints.len() + 1);
// The additional constraint should be ArrayAccessor
assert_eq!(needed_constraint, "ArrayAccessor");
}