--- a/testing/marionette/harness/marionette/runner/base.py
+++ b/testing/marionette/harness/marionette/runner/base.py
@@ -466,16 +466,21 @@ class BaseMarionetteArguments(ArgumentPa
 
         return dict(prefs())
 
     def verify_usage(self, args):
         if not args.tests:
             print 'must specify one or more test files, manifests, or directories'
             sys.exit(1)
 
+        for path in args.tests:
+            if not os.path.exists(path):
+                print '{0} does not exist'.format(path)
+                sys.exit(1)
+
         if not args.emulator and not args.address and not args.binary:
             print 'must specify --binary, --emulator or --address'
             sys.exit(1)
 
         if args.emulator and args.binary:
             print 'can\'t specify both --emulator and --binary'
             sys.exit(1)