Problem:    Compiling weird regexp pattern is very slow.
Solution:   When reallocating post list increase size by 50%. (Kuang-che Wu,
            closes vim/vim#4012)  Make assert_inrange() accept float values.
https://github.com/vim/vim/commit/38f08e76acf7d21bb34cf8f79f0f82eb63cdc987

Omit changes to typval_compare()
because patch v8.0.1505 was not ported.

Problem:    Assert_equalfile() does not give a hint about the difference.
Solution:   Display the last seen text.
https://github.com/vim/vim/commit/30cc44a97f0ba1349e1a522dab22b11f47888183

Problem:    Assert_equalfile() does not take a third argument.
Solution:   Implement the third argument. (Gary Johnson)
https://github.com/vim/vim/commit/fb517bac2384798bb5142ed1f75f965f93984c0a

Problem:    Assert functions don't return anything.
Solution:   Return non-zero when the assertion fails.
https://github.com/vim/vim/commit/65a5464985f980d2bbbf4e14d39d416dce065ec7

Problem:    Cannot write and read terminal screendumps.
Solution:   Add term_dumpwrite(), term_dumpread() and term_dumpdiff().
            Also add assert_equalfile().
https://github.com/vim/vim/commit/d96ff165113ce5fe62107add590997660e3d4802

Problem:    Assert_fails() does not fail inside try/catch.
Solution:   Set trylevel to zero. (Ozaki Kiichi, closes vim/vim#4639)
https://github.com/vim/vim/commit/7780e5c1c5485a979ab6e3914a43e17912e213a8

Problem:    If a test function exists Vim this may go unnoticed.
Solution:   Check for a test funtion quitting Vim.  Fix tests that did exit
            Vim.
https://github.com/vim/vim/commit/8903676d3d4c3fcb37d2a55c67370f30806b1626

Restore test_assert.vim to run Test_zz_quit_detected().