void () { myFixture.configureByText("a.xml", """ <x:all xmlns:x="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3.org/2001/XMLSchema http://www.w3.org/2001/XMLSchema.xsd http://www.w3.org/2001/XInclude http://www.w3.org/2001/XInclude.xsd"> <include xmlns="http://www.w3.org/2001/XInclude" href="a.xml"/> </x:all>"""); myFixture.testHighlighting(); }