New test hooks: before_test, before_each, after_each, after_test

[luciano-renzi]

There are 4 new test hook functions that can be defined in a test file:

• before_test: runs at the beginning of a test file, replaces setup
• before_each: runs before each test function
• after_each: runs after each test function
• after_test: runs allways at the end of a test file, replaces teardown