linters and tests

composer.json

composer.lock

src/API/CourseProviderInterface.php

src/Controller/GetCoursesByOrganization.php

src/Controller/GetCoursesByPerson.php

src/Controller/GetExamsByCourse.php

src/Controller/GetStudentsByCourse.php

src/DataProvider/CourseCollectionDataProvider.php

src/DataProvider/CourseItemDataProvider.php

src/Entity/Course.php

src/Entity/CourseAttendee.php

src/Entity/Exam.php

src/Resources/config/services.yaml

src/Service/DummyCourseProvider.php

tests/ApiTest.php

tests/Kernel.php

tests/Service/ExternalApiTest.php