rust: Add some unit tests for parse_byte_size in config

Differential Revision: https://phab.mercurial-scm.org/D10022
13 jobs for topic/default/rhg.blackbox in 27 minutes and 13 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Tests
passed #167946
checks-py2

00:02:43

passed #167947
checks-py3

00:03:06

passed #167948
rust-cargo-test-py2

00:01:30

passed #167949
rust-cargo-test-py3

00:02:16

passed #167950
test-py2

00:13:46

passed #167956
test-py2-chg

00:23:20

passed #167952
test-py2-pure

00:20:25

passed #167954
test-py2-rust

00:24:52

passed #167951
test-py3

00:17:41

passed #167957
test-py3-chg

00:10:35

passed #167953
test-py3-pure

00:15:40

passed #167955
test-py3-rust

00:10:00

 
  Phabricator
passed #167958
phabricator-refresh

00:01:05