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test_strict_comprehensive.cjs
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test_strict_comprehensive.cjs
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// Comprehensive Strict Mode Tests
// Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
console.log("=== Strict Mode Comprehensive Tests ===\n");
// Test 1: Converting mistakes into errors
console.log("Test 1: Assigning to undeclared variables");
try {
"use strict";
eval("x = 3.14;");
console.log(" FAIL: Should throw ReferenceError");
} catch (e) {
console.log(" PASS: " + e);
}
// Test 2: Octal literals
console.log("\nTest 2: Legacy octal literals");
try {
"use strict";
eval("let num = 0123;");
console.log(" FAIL: Should reject octal literals");
} catch (e) {
console.log(" PASS: Octal literals rejected");
}
// Test 3: Reserved words as identifiers
console.log("\nTest 3: Future reserved words");
const reservedWords = ["implements", "interface", "package", "private", "protected", "public", "static"];
let passedReserved = 0;
for (let i = 0; i < reservedWords.length; i++) {
try {
eval('"use strict"; let ' + reservedWords[i] + ' = 1;');
console.log(" FAIL: '" + reservedWords[i] + "' should be reserved");
} catch (e) {
passedReserved++;
}
}
console.log(" PASS: " + passedReserved + " of " + reservedWords.length + " reserved words blocked");
// Test 4: eval and arguments restrictions
console.log("\nTest 4: eval and arguments restrictions");
try {
"use strict";
eval("let eval = 5;");
console.log(" FAIL: Cannot assign to 'eval'");
} catch (e) {
console.log(" PASS: Cannot use 'eval' as identifier");
}
try {
"use strict";
eval("let arguments = 10;");
console.log(" FAIL: Cannot assign to 'arguments'");
} catch (e) {
console.log(" PASS: Cannot use 'arguments' as identifier");
}
// Test 5: with statement
console.log("\nTest 5: with statement");
try {
"use strict";
eval("with ({}) {}");
console.log(" FAIL: with statement should be disallowed");
} catch (e) {
console.log(" PASS: with statement blocked");
}
// Test 6: Function parameter restrictions
console.log("\nTest 6: Function parameter restrictions");
try {
"use strict";
eval("function f(a, b, a) {}");
console.log(" FAIL: Duplicate parameters should be disallowed");
} catch (e) {
console.log(" PASS: Duplicate parameters blocked");
}
try {
"use strict";
eval("function f(eval) {}");
console.log(" FAIL: 'eval' as parameter should be disallowed");
} catch (e) {
console.log(" PASS: Cannot use 'eval' as parameter name");
}
// Test 7: Strict mode in different contexts
console.log("\nTest 7: Strict mode in different contexts");
// Script-level strict mode
let scriptStrictWorks = false;
try {
eval('"use strict"; undeclared = 1;');
} catch (e) {
scriptStrictWorks = true;
}
console.log(" " + (scriptStrictWorks ? "PASS" : "FAIL") + ": Script-level strict mode");
// Function-level strict mode
function testFunctionStrict() {
"use strict";
try {
undeclared2 = 2;
return false;
} catch (e) {
return true;
}
}
console.log(" " + (testFunctionStrict() ? "PASS" : "FAIL") + ": Function-level strict mode");
console.log("\n=== All Tests Completed ===");

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