The filter test t/modules/filter.t fails, because mod_case_filter must be enabled using "CaseFilter On" in t/conf/extra.conf.in.
Unfortunately that directive is only per server. Since the module is shipped with httpd (as experimental) the only quick fix is adding another vhost in the test config for this test. The other test where mod_case_filter is involved is t/apache/pr17629.t, which does not fail, because it checks for the case filter to get automatically removed, which is true because it wasn't enabled in the first place :) On the long term it makes sense to add per directory enablement to mod_case_filter. Regards, Rainer