Exclude windows files when running unit tests

.travis.yml

@@ -36,7 +36,7 @@ install:
   - ./node_modules/.bin/prettier --list-different "{src,test}/**/*.js"
 script:
   - cd $REPO_ROOT/webext && npm test
-  - cd $REPO_ROOT/interfacer && go test src/browsh/*.go -v
+  - cd $REPO_ROOT/interfacer && go test $(find src/browsh -name *.go | grep -v windows)
   - cd $REPO_ROOT/interfacer && go test test/tty/*.go -v -ginkgo.flakeAttempts=3
   - cd $REPO_ROOT/interfacer && go test test/http-server/*.go -v
 after_failure:

interfacer/src/browsh/firefox_windows.go

@@ -1,3 +1,5 @@
+// +build windows
+
 package browsh
 
 import (