test: fix test for buffer regression nodejs#649

pass a regexp to assert.throws()

PR-URL: nodejs#9924
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-buffer-regression-649.js

@@ -6,8 +6,13 @@ const SlowBuffer = require('buffer').SlowBuffer;
 
 // Regression test for https://github.com/nodejs/node/issues/649.
 const len = 1422561062959;
-assert.throws(() => Buffer(len).toString('utf8'));
-assert.throws(() => SlowBuffer(len).toString('utf8'));
-assert.throws(() => Buffer.alloc(len).toString('utf8'));
-assert.throws(() => Buffer.allocUnsafe(len).toString('utf8'));
-assert.throws(() => Buffer.allocUnsafeSlow(len).toString('utf8'));
+const lenLimitMsg = new RegExp('^RangeError: (Invalid typed array length' +
+                               '|Array buffer allocation failed' +
+                               '|Invalid array buffer length)$');
+
+assert.throws(() => Buffer(len).toString('utf8'), lenLimitMsg);
+assert.throws(() => SlowBuffer(len).toString('utf8'), lenLimitMsg);
+assert.throws(() => Buffer.alloc(len).toString('utf8'), lenLimitMsg);
+assert.throws(() => Buffer.allocUnsafe(len).toString('utf8'), lenLimitMsg);
+assert.throws(() => Buffer.allocUnsafeSlow(len).toString('utf8'),
+              lenLimitMsg);