assertEquals Method for Multi-Select Picklist Values or Other Delimited Values

I couldn't find a way to easily assert that two multi-select picklist values are identical, especially considering that 'value1;value2' really should be considered equal to 'value2;value1'.

To fix this, I wrote an auxiliary class System2 that has a custom assertEquals method that asserts two Strings contain the same delimited values.

The code is verified by checking the following cases in an associated test class:

s1	s2	result
		pass
	a	fail
a		fail
a	a	pass
a	a;b	fail
a;b	a	fail
a;b	a;b	pass
b;a	a;b	pass
a;b	b;a	pass
a;b;c	c;a;b	pass
b;a;c	a;b;c	pass
a;b;c	a;b;c;d	fail
a;b;c;d	a;b;c	fail