Nullary function based test case

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##### Nullary function based test case

The most widely used are test cases based on a nullary function. These include nullary free functions, nullary function objects created with `boost::bind` and nullary `boost::function` instances. The simplest is a free function and the UTF provides facilities to create a free function based test case that is automatically registered. Here are the two construction interfaces:

- Manually registered test case
- Test case with automated registration