Fix style and indentation
Mock static methods in the test class rather than the tests themselves
Initialise the appender in the double close test
CHeck that close do not fail if the appender hasn't been initalised
Rename level conversion test method (log4j)
Use DataProvider for level conversions test
Move tests about failures in a dedicated class
Automatically assert that there is no errors
Move dsn discovery tests in a dedicated class
Use NonStrict injectable rather than having NonStrictExpectations
Move close test in a dedicated class
Do not use a "global" test file for appender tests
Rename ClosingConnectionTest in close test
Print error messages with MockUpErrorHandler
Add assertions on the error count
Fix tests style
Add assert no error as tearDown
Start appender properly before testing it