function shouldThrow(func, errorMessage) { var errorThrown = false; var error = null; try { func(); } catch (e) { errorThrown = true; error = e; } if (!errorThrown) throw new Error('not thrown'); if (String(error) !== errorMessage) throw new Error(`bad error: ${String(error)}`); } function test(i, radix) { return i.toString(radix); } noInline(test); for (var i = 0; i < 1e4; ++i) { shouldThrow(() => test(i, 42), `RangeError: toString() radix argument must be between 2 and 36`); }