[PATCH 1/2] test: copy files in test_expect_equal_file instead of moving them

Before the change, test_expect_equal_file moved files it compared in case of failure. The patch changes it to copy the files instead. This allows testing non-temporary files which are stored in git. Note: the change should not result in new temporary files left after the tests.

[PATCH 1/2] test: copy files in test_expect_equal_file instead of moving them

Before the change, test_expect_equal_file moved files it compared in case of failure. The patch changes it to copy the files instead. This allows testing non-temporary files which are stored in git. Note: the change should not result in new temporary files left after the tests.