# expect_s[34]_class can check not S3/S4
factor() is an S3 object
---
A() is an S4 object
# test_s4_class respects class hierarchy
C() inherits from 'C'/'A'/'B'/'list'/'vector' not 'D'.
# test_s3_class respects class hierarchy
`x` inherits from 'a'/'b' not 'c'.
---
`x` inherits from 'a'/'b' not 'c'/'d'.
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