Write most backend tests

src/main.py

@@ -92,7 +92,7 @@ async def get_course_progress(
     return crud_courseprogress.get_course_progress(db, current_user, course)
 
 
-@app.patch("/courseprogress")
+@app.patch("/courseprogress", response_model=List[courseprogress.CourseProgressBase])
 async def patch_course_progress(
     course_progress: courseprogress.CourseProgressBase,
     current_user_name: str = Depends(crud_authentication.get_current_user_name),