Wiki: Testing example lacks syntax highlighting

[MaoShizhong]

The odin bot testing wiki page has a plain code block that could do with JS syntax highlighting.

The first paragraph also has a couple of grammar typos:

Everything else will need tested with a variety of test cases. If you are unsure of what needs tested, just ask.

which should be

Everything else will need to be tested with a variety of test cases. If you are unsure of what needs to be tested, just ask.

or

Everything else will need testing with a variety of test cases. If you are unsure of what needs testing, just ask.