Extract common assertion patterns into methods #2189

Job	Run time
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	1m 15s
vterm-yamatanooroti 2.7	1m 14s
vterm-yamatanooroti 3.0 (latest reline)	48s
vterm-yamatanooroti 3.0	48s
vterm-yamatanooroti 3.1 (latest reline)	49s
vterm-yamatanooroti 3.1	53s
vterm-yamatanooroti 3.2 (latest reline)	46s
vterm-yamatanooroti 3.2	33s
vterm-yamatanooroti head (latest reline)	1m 1s
vterm-yamatanooroti head	42s
rake test 2.7 (latest reline)	52s
rake test 2.7	54s
rake test 3.0 (latest reline)	39s
rake test 3.0	31s
rake test 3.1 (latest reline)	34s
rake test 3.1	39s
rake test 3.2 (latest reline)	30s
rake test 3.2	31s
rake test head (latest reline)	40s
rake test head	26s
rake test truffleruby-head (latest reline)	5m 51s
rake test truffleruby-head	5m 42s
	26m 40s

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