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// BUG-003: Array Index Assignment Not Supported
// EXTREME TDD Protocol: RED → GREEN → REFACTOR → VALIDATE
// GitHub Issue: https://github.com/paiml/ruchy-book/blob/main/docs/bugs/ruchy-runtime-bugs.md#bug-003
use predicates::prelude::*;
/// RED PHASE: These tests WILL FAIL until array index assignment is implemented
/// Current Error: "Invalid assignment target" for matrix[i][j] = value
/// Expected: Support nested array index assignment like Rust
// ============================================================================
// TEST GROUP 1: Simple Array Index Assignment
// ============================================================================
#[test]
fn test_bug_003_simple_array_assignment() {
// Pattern: arr[0] = value
let code = r"
let mut arr = vec![1, 2, 3];
arr[0] = 99;
println(arr[0]);
";
let mut cmd = assert_cmd::cargo::cargo_bin_cmd!("ruchy");
cmd.arg("-e")
.arg(code)
.assert()
.success()
.stdout(predicate::str::contains("99"));
}
#[test]
fn test_bug_003_array_assignment_transpile() {
// Verify transpiler generates valid Rust code
let code = r"
let mut arr = vec![1, 2, 3];
arr[0] = 99;
";
let mut cmd = assert_cmd::cargo::cargo_bin_cmd!("ruchy");
cmd.arg("transpile")
.arg("-") // Read from stdin
.write_stdin(code.to_string())
.assert()
.success()
.stdout(predicate::str::contains("arr[0 as usize]").and(predicate::str::contains("= 99")));
}
// ============================================================================
// TEST GROUP 2: Nested Array Index Assignment (Matrix Operations)
// ============================================================================
#[test]
fn test_bug_003_nested_array_assignment() {
// Pattern: matrix[i][j] = value (CRITICAL for BENCH-002)
let code = r"
let mut matrix = vec![vec![1, 2], vec![3, 4]];
matrix[0][1] = 99;
println(matrix[0][1]);
";
let mut cmd = assert_cmd::cargo::cargo_bin_cmd!("ruchy");
cmd.arg("-e")
.arg(code)
.assert()
.success()
.stdout(predicate::str::contains("99"));
}
#[test]
fn test_bug_003_matrix_update_loop() {
// Pattern: Update all matrix elements in loop (BENCH-002 pattern)
let code = r"
let mut matrix = vec![vec![0, 0], vec![0, 0]];
let mut i = 0;
while i < 2 {
let mut j = 0;
while j < 2 {
matrix[i][j] = i * 2 + j;
j = j + 1;
}
i = i + 1;
}
println(matrix[1][1]);
";
let mut cmd = assert_cmd::cargo::cargo_bin_cmd!("ruchy");
cmd.arg("-e")
.arg(code)
.assert()
.success()
.stdout(predicate::str::contains("3")); // matrix[1][1] should be 1*2 + 1 = 3
}
// ============================================================================
// TEST GROUP 3: Assignment with Expressions
// ============================================================================
#[test]
fn test_bug_003_index_assignment_with_expression() {
// Pattern: arr[i] = expr (not just literal)
let code = r"
let mut arr = vec![1, 2, 3];
arr[1] = arr[0] + arr[2];
println(arr[1]);
";
let mut cmd = assert_cmd::cargo::cargo_bin_cmd!("ruchy");
cmd.arg("-e")
.arg(code)
.assert()
.success()
.stdout(predicate::str::contains("4")); // 1 + 3 = 4
}
// ============================================================================
// TEST GROUP 4: BENCH-002 Validation (Matrix Multiplication)
// ============================================================================
#[test]
fn test_bug_003_bench_002_matrix_multiplication() {
// Simplified BENCH-002: 2x2 matrix multiplication
let code = r"
let mut a = vec![vec![1, 2], vec![3, 4]];
let mut b = vec![vec![2, 0], vec![1, 2]];
let mut result = vec![vec![0, 0], vec![0, 0]];
let mut i = 0;
while i < 2 {
let mut j = 0;
while j < 2 {
let mut k = 0;
let mut sum = 0;
while k < 2 {
sum = sum + a[i][k] * b[k][j];
k = k + 1;
}
result[i][j] = sum;
j = j + 1;
}
i = i + 1;
}
println(result[0][0]);
";
let mut cmd = assert_cmd::cargo::cargo_bin_cmd!("ruchy");
cmd.arg("-e")
.arg(code)
.assert()
.success()
.stdout(predicate::str::contains("4")); // result[0][0] = 1*2 + 2*1 = 4
}
// ============================================================================
// PROPERTY TEST: Array assignment preserves other elements
// ============================================================================
#[test]
fn property_array_assignment_preserves_others() {
use proptest::prelude::*;
proptest!(|(val1 in 0..100i32, val2 in 0..100i32, new_val in 0..100i32)| {
let code = format!(r"
let mut arr = vec![{val1}, {val2}, 999];
arr[1] = {new_val};
println(arr[0]);
println(arr[1]);
println(arr[2]);
");
let mut cmd = assert_cmd::cargo::cargo_bin_cmd!("ruchy");
let output = cmd.arg("-e").arg(&code).output().unwrap();
let stdout = String::from_utf8_lossy(&output.stdout);
// arr[0] should be unchanged
assert!(stdout.contains(&val1.to_string()));
// arr[1] should be new value
assert!(stdout.contains(&new_val.to_string()));
// arr[2] should be unchanged
assert!(stdout.contains("999"));
});
}