Session07 Tasks

Task 1 - Testing Testing, 1 2 3 
Whenever possible and practical unit tests should only test one unit of code. This test currently requires that two classes, `Html()` and `Body()`, and one method be working properly for the test to pass. Consider reducing the number of units in each of your tests. `test_body()` could test the instantiation of `Body()` via `isinstance()` and `render()`; `test_body_append()` could test the `.append()` method of `Body()`.