Peter Zhu 87c4ebd001 Fix tests using assert_raise_with_message on US-ASCII systems
On systems where the Encoding.default_internal defaults to US-ASCII instead
of UTF-8, some tests using assert_raise_with_message can fail since it no
longer changes Encoding.default_internal in 79f5202.

This tests explicitly uses EnvUtil.with_default_internal on systems where
these tests fail.
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