Revert "Wrap tests in xvfb-run to simulate an X server."

This reverts commit 4612d3b.

Author: jgm

.github/workflows/ci.yml

@@ -36,4 +36,3 @@ jobs:
 
       - name: Run tests in Docker image
         run: make docker-test
-

.tools/Dockerfile

@@ -38,8 +38,7 @@ RUN apt-get -q --no-allow-insecure-repositories update \
        texlive-pictures \
        texlive-plain-generic \
        texlive-xetex \
-       wget \
-       xvfb
+       wget
 
 ARG plantuml_jar=plantuml.1.2018.9.jar
 RUN wget https://sourceforge.net/projects/plantuml/files/${plantuml_jar} \

Makefile

@@ -7,9 +7,6 @@ LUA_FILTERS_TEST_IMAGE = pandoc/lua-filters-test
 test:
 	sh runtests.sh $(FILTERS)
 
-test-docker:
-	xvfb-run sh runtests.sh $(FILTERS)
-
 archive: .build/lua-filters.tar.gz
 
 archives: .build/lua-filters.tar.gz .build/lua-filters.zip
@@ -23,7 +20,7 @@ docker-test:
 	       --rm \
 	       --volume "$(PWD):/data" \
 	       --entrypoint /usr/bin/make \
-	       $(LUA_FILTERS_TEST_IMAGE) FILTERS="${FILTERS}" test-docker
+	       $(LUA_FILTERS_TEST_IMAGE) FILTERS="${FILTERS}"
 
 docker-test-image: .tools/Dockerfile
 	docker build --tag $(LUA_FILTERS_TEST_IMAGE) --file $< .