A single javascript file that contains every ECMA-262 edition 5.1 grammatical production.
Mocha:
test("exercise my program", function(done) {
fs.readFile(require.resolve("everything.js"), function(err, programText) {
var program = esprima.parse("" + programText);
assert.equal(runMyProgramOn(program), /* expected value */, "message");
done();
});
});