fix custom template loading for core tests
fix custom template loading for core tests

mjang/mj-asciidoc,cuit-zhaxin/asciidoctor,cuit-zhaxin/asciidoctor,asciidocfx/asciidoctor,neontapir/asciidoctor,yukisan/asciidoctor,cesarmarinhorj/asciidoctor,glamouracademy/asciidoctor,pepijnve/asciidoctor,anthonny/asciidoctor,pepijnve/asciidoctor,asciidocfx/asciidoctor,anthonny/asciidoctor,benignbala/asciidoctor,neontapir/asciidoctor,yukisan/asciidoctor,gjtorikian/asciidoctor,mjang/mj-asciidoc,glamouracademy/asciidoctor,gjtorikian/asciidoctor,benignbala/asciidoctor