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//! Tree-sitter based mutation operators for language-agnostic mutation testing
//!
//! EXTREME TDD: RED PHASE - Stub implementation, tests will fail
//!
//! This module provides a language-agnostic mutation operator trait that works
//! with tree-sitter ASTs instead of language-specific parsers like syn.
use super::types::SourceLocation;
use tree_sitter::Node;
/// A mutated source code variant
#[derive(Debug, Clone)]
pub struct MutatedSource {
pub source: String,
pub description: String,
pub location: SourceLocation,
}
/// Trait for tree-sitter based mutation operators
///
/// Unlike the syn-based operators, these work on tree-sitter AST nodes
/// which are language-agnostic.
pub trait TreeSitterMutationOperator: Send + Sync {
/// Name of this operator (e.g., "AOR", "ROR")
fn name(&self) -> &str;
/// Can this operator mutate the given AST node?
fn can_mutate(&self, node: &Node, source: &[u8]) -> bool;
/// Generate mutants for the given node
///
/// # Arguments
/// * `node` - The AST node to mutate
/// * `source` - The original source code as bytes
///
/// # Returns
/// Vector of mutated source variants
fn mutate(&self, node: &Node, source: &[u8]) -> Vec<MutatedSource>;
/// Estimated kill probability (0.0 - 1.0)
fn kill_probability(&self) -> f64 {
0.5 // Default 50%
}
}
#[cfg_attr(coverage_nightly, coverage(off))]
#[cfg(test)]
mod tests {
use super::*;
// RED PHASE: These tests will fail until implementation
#[test]
#[ignore] // RED: Will fail - not implemented yet
fn red_test_source_location_has_line_and_column() {
let loc = SourceLocation {
line: 10,
column: 5,
end_line: 10,
end_column: 10,
};
assert_eq!(loc.line, 10);
assert_eq!(loc.column, 5);
}
#[test]
#[ignore] // RED: Will fail - not implemented yet
fn red_test_mutated_source_has_description() {
let mutant = MutatedSource {
source: "return a - b;".to_string(),
description: "+ → -".to_string(),
location: SourceLocation {
line: 1,
column: 10,
end_line: 1,
end_column: 11,
},
};
assert_eq!(mutant.description, "+ → -");
assert!(mutant.source.contains("a - b"));
}
}