mac should also have Xvfb

Author: ntBre

src/tests.rs

@@ -7,13 +7,9 @@ use std::process::Command;
 
 #[test]
 fn main() {
-    // setup xephyr
-    #[cfg(target_os = "linux")]
+    // setup xvfb
     let mut cmd = Command::new("Xvfb").arg(":1").spawn().unwrap();
 
-    #[cfg(not(target_os = "linux"))]
-    let mut cmd = Command::new("xvfb").arg(":1").spawn().unwrap();
-
     // wait for xephyr to start
     let mut dpy = unsafe { xlib::XOpenDisplay(c":1.0".as_ptr()) };
     while dpy.is_null() {