Add failing test about resolving nested $refs #426

Job	Run time
test (ubuntu-latest, 2.7)	48s
test (ubuntu-latest, 3)	36s
test (ubuntu-latest, 3.1)	34s
test (ubuntu-latest, 3.2)	35s
test (ubuntu-latest, 3.3)	39s
test (ubuntu-latest, jruby)	2m 43s
test (ubuntu-latest, jruby-head)	2m 41s
test (ubuntu-latest, truffleruby)	2m 18s
test (ubuntu-latest, truffleruby-head)	2m 29s
test (windows-latest, 2.7)	3m 5s
test (windows-latest, 3)	2m 59s
test (windows-latest, 3.1)	2m 8s
test (windows-latest, 3.2)	1m 45s
test (windows-latest, 3.3)	2m 57s
test (windows-latest, head)	2m 17s
test (windows-latest, jruby)	1m 3s
test (windows-latest, jruby-head)	1m 5s
test (macos-latest, 2.7)	43s
test (macos-latest, 3)	29s
test (macos-latest, 3.1)	31s
test (macos-latest, 3.2)	28s
test (macos-latest, 3.3)	27s
test (macos-latest, jruby)	1m 32s
test (macos-latest, jruby-head)	1m 28s
test (macos-latest, truffleruby)	1m 15s
test (macos-latest, truffleruby-head)	1m 29s
	39m 4s

Provide feedback