Function is

src/keyboard/vim_test.js:123–125

(a)

    throw failure("Expected " + a +  " to be equal to " + b, eq);
}
function is(a) {
  if (!a) throw failure("Expected " + a +  " to be truthy", is);
}
function failure(message, root) {
  var error = new Error(message);
  if (Error.captureStackTrace)