test: assert.throws() should include a RegExp

PR-URL: #997
Reviewed-By: Prince John Wesley <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>

Author: cByst

test/parallel/test-child-process-detached.js

@@ -18,7 +18,7 @@ process.on('exit', function() {
   assert(persistentPid !== -1);
   assert.throws(function() {
     process.kill(child.pid);
-  });
+  }, /^Error: kill ESRCH$/);
   assert.doesNotThrow(function() {
     process.kill(persistentPid);
   });