manipulation test helper doesn't wrap test()

Apart from the name change, here is what I changed in this helper.

Test helpers are supposed to be called from within tests. For example:
```
test("Should work", function(){
    awesomeHelperThatMakesEverythingSuperEasyBecauseItWasAllTheSameSuccessionAnywaySoWhyDidntWeHaveThisBefore({testData: "foo"});
});
```

What `testWymManipulation` currently does is wrap around `test()`.

This is wrong, because, well, generally we'd want `test()` calls to be top level in test code.

We want them to be top level because we want them to run for sure. If they are wrapped, an error in the wrapper—in this case `testWymManipulation`—could prevent them from running. And we really don't want to give that a chance of happening.

Another reason is that if a test helper wraps around `test()`, then it must be the entry point for that test. This means that we wouldn't be able to call it from another test helper. For example, if we want to loop through some data–driven–test, we wouldn't be able to do that:
```
var data = ["one", "two", "zreeeee%@#!"];

test("Check one, two and three", function(){
    data.forEach(helpfulTestHelper);
);
```
If the above `helpfulTestHelper` calls `test()`, you can't use it like that.

So, this is the change I made here.