TST: Check series names

[sinhrks]

Related to #9972. Made assert_series_equal to check name attribute.

[jreback]

lgtm. any things that we need to put to watch out for in the future? e.g. where you needed to do check_names=False but couldn't check the name?

[sinhrks]

As far as I know:

• eval using numexpr (BUG: numexpr eval doesn't hold column name via single column selection #10239)
• value_counts (BUG/API: inconsistent name handling in value_counts  #10150)

But we may find further when adding name attribute to all Series in test cases.

[jreback]

@sinhrks but you are testing this no? (e.g. you added it and fixed what was necessary)

[sinhrks]

Ah, I meant the name attributes of existing test cases are all tested. But I didn't change test cases which uses Series(..., name=None) yet, and adding explicit name may reveal further problem.

I'll continue to work on Index and Series metadata issues, hopefully change all test cases to have explicit name assignment like below (intends to be a fix for #10150):

• master...sinhrks:base_name_handling

[jreback]

ahh, I see. cool. ok let's merge this. thanks!