#95: add option to build script to run tests using xvbf

build.sh

@@ -40,6 +40,7 @@ VT_TV_COVERAGE_ENABLED=$(on_off ${VT_TV_COVERAGE_ENABLED:-OFF})
 VT_TV_CLEAN=$(on_off ${VT_TV_CLEAN:-ON})
 VT_TV_PYTHON_BINDINGS_ENABLED=$(on_off ${VT_TV_PYTHON_BINDINGS_ENABLED:-OFF})
 VT_TV_WERROR_ENABLED=$(on_off ${VT_TV_WERROR_ENABLED:-OFF})
+VT_TV_XVFB_ENABLED=$(on_off ${VT_TV_WERROR_ENABLED:-OFF})
 # >> Run tests settings
 VT_TV_RUN_TESTS=$(on_off ${VT_TV_RUN_TESTS:-OFF})
 VT_TV_RUN_TESTS_FILTER=${VT_TV_RUN_TESTS_FILTER:-""}
@@ -76,6 +77,8 @@ help() {
       -r   --tests-run=[bool]       Run unit tests (and build coverage report if coverage is enabled) (VT_TV_RUN_TESTS=$VT_TV_RUN_TESTS)
       -f   --tests-run-filter=[str] Filter unit test to run. (VT_TV_RUN_TESTS_FILTER=$VT_TV_RUN_TESTS_FILTER)
 
+      -x   --xvfb=[bool]            Use X Virtual Frame Buffer instead of default for rendering (VT_TV_XVFB_ENABLED=$VT_TV_XVFB_ENABLED)
+
       -h   --help                   Show help and default option values.
 
   Examples:
@@ -123,6 +126,7 @@ while getopts btch-: OPT; do  # allow -b -t -c -h, and --long_attr=value"
     r | tests-run )       VT_TV_RUN_TESTS=$(on_off $OPTARG) ;;
     f | tests-run-filter) VT_TV_RUN_TESTS_FILTER="$OPTARG" ;;
     k | vtk-dir )         VTK_DIR=$(realpath "$OPTARG") ;;
+    x | xvfb )            VT_TV_XVFB_ENABLED=$(on_off $OPTARG) ;;
     h | help )            help ;;
 
     \? )           exit 2 ;;  # bad short option (error reported via getopts)
@@ -142,6 +146,7 @@ echo VT_TV_PYTHON_BINDINGS_ENABLED=$VT_TV_PYTHON_BINDINGS_ENABLED
 echo VT_TV_RUN_TESTS=$VT_TV_RUN_TESTS
 echo VT_TV_TESTS_ENABLED=$VT_TV_TESTS_ENABLED
 echo VT_TV_TEST_REPORT=$VT_TV_TEST_REPORT
+echo VT_TV_XVFB_ENABLED=$VT_TV_XVFB_ENABLED
 echo VT_TV_RUN_TESTS_FILTER=$VT_TV_RUN_TESTS_FILTER
 echo VT_TV_COVERAGE_ENABLED=$VT_TV_COVERAGE_ENABLED
 echo VT_TV_COVERAGE_REPORT=$VT_TV_COVERAGE_REPORT
@@ -208,10 +213,20 @@ if [[ "$VT_TV_RUN_TESTS" == "ON" ]]; then
 
   gtest_cmd="\"$VT_TV_BUILD_DIR/tests/unit/AllTests\" $GTEST_OPTIONS"
   echo "Run GTest..."
+
+  CURRENT_DISPLAY=$(echo $DISPLAY)
+  if [[ "$VT_TV_RUN_TESTS" == "ON" ]]; then
+    export DISPLAY=:99.0
+    Xvfb :99 -screen 0 1024x768x24 -nolisten tcp > /dev/null 2>&1 &
+    sleep 1s
+  fi
   eval "$gtest_cmd" || true
+  if [[ "$VT_TV_RUN_TESTS" == "ON" ]]; then
+    pkill Xvfb
+    export DISPLAY=$CURRENT_DISPLAY
+  fi
 
   echo "Tests done."
-
   popd
 fi