test: Simplify the DiffTest tests #746

Job	Run time
AutoReview Tests	20s
Lint CS	20s
Unit Tests (PHP 8.1, locked)	20s
Update the RequirementChecker	0s
Unit Tests (PHP 8.1, lowest)	29s
Wait for the PHAR & Docker images	2m 4s
Unit Tests (PHP 8.1, highest)	39s
Unit Tests (PHP 8.2, highest)	27s
Unit Tests (PHP 8.3, highest, --ignore-platform-req=php+)	55s
End-to-End Tests (_test_e2e_pass_no_config_min_composer_php, ghcr.io/box-project/box_php725)	24s
End-to-End Tests (_test_e2e_pass_no_config_min_box_php, ghcr.io/box-project/box_php81)	28s
End-to-End Tests (_test_e2e_pass_complete_min_composer_php, ghcr.io/box-project/box_php725)	17s
End-to-End Tests (_test_e2e_pass_complete_min_box_php, ghcr.io/box-project/box_php81)	38s
End-to-End Tests (_test_e2e_fail_complete_min_composer_php, ghcr.io/box-project/box_php725)	26s
End-to-End Tests (_test_e2e_fail_complete_min_box_php, ghcr.io/box-project/box_php81)	31s
End-to-End Tests (_test_e2e_skip_min_composer_php, ghcr.io/box-project/box_php725)	18s
End-to-End Tests (_test_e2e_pass_complete_requirement_checker_not_disabled, ghcr.io/box-project/b...	17s
End-to-End Tests (_test_e2e_fail_conflict, ghcr.io/box-project/box_php81)	36s
RequirementChecker status	2s
	9m 31s

Provide feedback