Issue #2997593 by Steven Jones: Extend 8.x core tests

src/Tests/FileMoveTest.php

tests/src/Functional/FileMoveTest.php

tests/src/Functional/ImageAdminStylesTest.php

tests/src/Functional/ImageDimensionsTest.php

tests/src/Functional/ImageEffectsTest.php

tests/src/Functional/ImageFieldDefaultImagesTest.php

tests/src/Functional/ImageFieldDisplayTest.php

tests/src/Functional/ImageFieldValidateTest.php

tests/src/Functional/ImageFieldWidgetTest.php

tests/src/Functional/ImageOnTranslatedEntityTest.php

tests/src/Functional/ImageStyleDeleteTest.php

tests/src/Functional/ImageStyleFlushTest.php

tests/src/Functional/ImageStylesPathAndUrlTest.php

tests/src/Functional/QuickEditImageControllerTest.php

tests/src/Functional/Update/ImageUpdateTest.php

tests/src/FunctionalJavascript/ImageAdminStylesTest.php

tests/src/FunctionalJavascript/ImageFieldValidateTest.php

tests/src/FunctionalJavascript/QuickEditImageTest.php

tests/src/Kernel/ImageFormatterTest.php

tests/src/Kernel/ImageImportTest.php