Check that a class has expected names
     
    
    Usage
    assert_class_fields(x, expected_fields)
 
     
    
    Arguments
- x
 
An object to be tested as having expected_fields class member
names.
 
- expected_fields
 
A character vector of expected class member names.
 
 
    
    Value
    Invisibly returns x; primarily called for its side effects.