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test-concat-crash.js
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test-concat-crash.js
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// ============================================
// TEST: Concatenation crashes with user-defined toString
// ============================================
// Bug: "" + obj crashes silently when obj has user-defined toString
// ============================================
console.log("=== CONCAT CRASH TESTS ===\n");
// --- BASELINE (should work) ---
console.log("1. No custom toString:");
const obj1 = {};
console.log(" result: " + ("" + obj1));
console.log("\n2. toString = native function:");
const obj2 = { toString: Object.prototype.toString };
console.log(" result: " + ("" + obj2));
console.log("\n3. toString = Array.prototype.toString:");
const obj3 = { toString: Array.prototype.toString };
console.log(" result: " + ("" + obj3));
console.log("\n4. toString = console.log (native):");
const obj4 = { toString: console.log };
console.log(" result: " + ("" + obj4));
// --- CRASH TESTS (these crash silently) ---
console.log("\n5. toString = user function:");
const obj5 = { toString: function() { return "custom"; } };
console.log(" expected: custom");
console.log(" direct call: " + obj5.toString());
const result5 = "" + obj5;
console.log(" concat: " + result5);
console.log(" (if missing, CRASH)");
console.log("\n6. toString = arrow function:");
const obj6 = { toString: () => "arrow" };
console.log(" expected: arrow");
console.log(" direct call: " + obj6.toString());
const result6 = "" + obj6;
console.log(" concat: " + result6);
console.log(" (if missing, CRASH)");
console.log("\n7. toString = user function returning number:");
const obj7 = { toString: function() { return 42; } };
console.log(" expected: 42");
console.log(" direct call: " + obj7.toString());
const result7 = "" + obj7;
console.log(" concat: " + result7);
console.log(" (if missing, CRASH)");
console.log("\n8. Inherited toString from prototype:");
function MyClass() {}
MyClass.prototype.toString = function() { return "inherited"; };
const obj8 = new MyClass();
console.log(" expected: inherited");
console.log(" direct call: " + obj8.toString());
const result8 = "" + obj8;
console.log(" concat: " + result8);
console.log(" (if missing, CRASH)");
console.log("\n9. toString as getter returning function:");
const obj9 = { get toString() { return function() { return "getter"; }; } };
console.log(" expected: getter");
const result9 = "" + obj9;
console.log(" concat: " + result9);
console.log("\n10. toString = non-function value:");
const obj10 = { toString: "not a function" };
console.log(" expected: TypeError");
try {
const result10 = "" + obj10;
console.log(" concat: " + result10);
console.log(" ERROR: should have thrown TypeError!");
} catch (e) {
console.log(" threw: " + e.name + " (correct)");
}
console.log("\n=== DONE ===");

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