# Extracts and executes all the docunits in the readme of the `mgroup`
	# Returns a JUnit-compatible `<testsuite>` XML element that contains the results of the executions.
	fun test_group(mgroup: MGroup): HTMLTag
	do
		var ts = new HTMLTag("testsuite")
		toolcontext.info("nitunit: doc-unit group {mgroup}", 2)

		# usually, only the default module must be imported in the unit test.
		var o = mgroup.default_mmodule

		ts.attr("package", mgroup.full_name)

		var prefix = toolcontext.test_dir
		prefix = prefix.join_path(mgroup.to_s)
		var d2m = new NitUnitExecutor(toolcontext, prefix, o, ts, "Docunits of group {mgroup.full_name}")

		total_entities += 1
		var mdoc = mgroup.mdoc
		if mdoc == null then return ts

		doc_entities += 1
		# NOTE: jenkins expects a '.' in the classname attr
		d2m.extract(mdoc, "nitunit." + mgroup.mpackage.name + "." + mgroup.name + ".<group>", "<group>")

		d2m.run_tests

		return ts
	end