test: Refactor reference to Test::Unit to single file.
test: Refactor: Move setup/cleanup to OpenSCAP::TestCase
test: Refactor: Move DataStream related tests to separate file.
test: Export of OVAL variables
test: Print error message when other than expected.
test: Test export of XCCDF results
test: Refactor: Extract method: assert_exported
test: Support for libopenscap_testing
test: Export of HTML report
test: Sort lists before comparison
Introduce OpenSCAP::Xccdf::Session.remediate
test: Register EXSLT to produce valid HTML reports

Addressing:
XPath error : Unregistered function
runtime error: file openscap/xsl/xccdf-share.xsl line 56 element apply-templates
Failed to evaluate the 'select' expression.
xmlXPathCompOpEval: function date-time not found
XPath error : Unregistered function
xmlXPathCompiledEval: evaluation failed
runtime error: file openscap/xsl/oscap-share.xsl line 37 element variable
Evaluating global variable  var/param being computed failed
xmlXPathCompOpEval: function node-set not found
XPath error : Unregistered function
runtime error: file openscap/xsl/xccdf-share.xsl line 61 element variable
Evaluating global variable  var/param being computed failed
test: remediate