Refactor tests to make it easier to add new example functions (#306)

* Refactor tests to make it easier to add more example functions

This makes it so that it is possible to add a new example while only
modifying one location in the code. Add a new class / function / exception
in test_integration, indicate the expected output with the @expected decorator.
More efficient than having to modify three different files like we had to do
before.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Some minor improvements

* Fix test

* Ignore types in test_integration.py

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -2,11 +2,11 @@
 
 ## 1.21.5
 
--  More robust determination of rtype location / fix issue 302
+- More robust determination of rtype location / fix issue 302
 
 ## 1.21.4
 
--  Improvements to the location of the return type
+- Improvements to the location of the return type
 
 ## 1.21.3
 

pyproject.toml

@@ -75,7 +75,7 @@ testpaths = ["tests"]
 [tool.mypy]
 python_version = "3.10"
 strict = true
-exclude = "^.*/roots/.*$"
+exclude = "^(.*/roots/.*)|(tests/test_integration.py)$"
 
 
 [[tool.mypy.overrides]]