New CheckstyleTestMakeupCheck

[rnveach]

Identified at checkstyle/regression-tool#85 (comment) ,

We need a new check to bring uniformity to our UTs in Checkstyle.
There are so many ways to write a test that some conflict with our custom check in regression to read these checks easily.

1. Some properties are defined with variables:
   https://github.com/checkstyle/checkstyle/blob/master/src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/AbstractClassNameCheckTest.java#L66
2. Some check configurations are defined as a class field and some are defined as local variables:
   https://github.com/checkstyle/checkstyle/blob/master/src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/DefaultComesLastCheckTest.java#L43

I am currently naming the check CheckstyleTestMakeupCheck and started a preview of the check at https://github.com/rnveach/checkstyle/commits/regression_util.

We should make a check that only examines methods defined with @Test and have a verify method call.
The method must have a local variable defining a DefaultConfiguration and assigning it with either createModuleConfig(...) or one of our other standard configuration creation methods.
If it calls addAttribute on the DefaultConfiguration the property name must be a string, and the property value must either be: a String, a concatentation of 2 or more strings, a enumeration toString in the form XXX.YYY.toString(), getPath(String), or the literal null (which is technically not supported in the configuration file).

@romani Please review and approve.
Let me know if you can think of anything else to verify.

[romani]

If it can resolve problems in our code we are ok to have it, even it is very specific to our repo and nobody will use it expect for us.

[rnveach]

Check needs to be changed to understand tests with multiple configurations in 1 test.
Example:
https://github.com/checkstyle/checkstyle/blob/2aca36156fa461f2d54f1386743a0146bdf8b4bd/src/test/java/com/puppycrawl/tools/checkstyle/checks/header/HeaderCheckTest.java#L236-L247
1 test defines custom HeaderCheck, and defines custom Checker.
We need to distinguish between them and make sure all are configured correctly from each other.

[rnveach]

Check was merged.

[rnveach]

@romani Feel free to release sevntu whenever you can.