Add: start linux xvfb-run for unit test

This is the only way to get it working on AArch64 build server.

The other OS
windows: direct program startup
macOs: direct program startup

Author: GerryFerdinandus

scripts/travis_unit_test.sh

@@ -11,19 +11,32 @@ then
   # show openSSL version
   openssl version
 
+  # Exit immediately if a command exits with a non-zero status.
+  set -e
+  xvfb-run enduser/test_trackereditor -a --format=plain
+  set +e
+
 elif [ "$TRAVIS_OS_NAME" = "osx" ]
 then
   # show macOS version
   sw_vers
 
   # show openSSL version
   openssl version
+
+  # Exit immediately if a command exits with a non-zero status.
+  set -e
+  enduser/test_trackereditor -a --format=plain
+  set +e
+
+elif [ "$TRAVIS_OS_NAME" = "windows" ]
+then
+  # Exit immediately if a command exits with a non-zero status.
+  set -e
+  enduser/test_trackereditor -a --format=plain
+  set +e
 fi
 
-# Exit immediately if a command exits with a non-zero status.
-set -e
-enduser/test_trackereditor -a --format=plain
-set +e
 
 # Remove all the extra file created by test
 # We do not what it in the ZIP release files.