add a test for new --file option. ref #170

Author: paulirish

test/git-open.bats

@@ -183,6 +183,19 @@ setup() {
   assert_output "https://gist.github.com/2d84a6db1b41b4020685"
 }
 
+@test "gh: --file option" {
+  run ../git-open -f readme.txt
+  assert_output "https://github.com/paulirish/git-open/tree/master/readme.txt"
+
+  # and now a new file in a subdirectory.
+  mkdir -p subdir
+  touch subdir/howdy.txt
+  git add subdir
+  git commit -am add-in-howdy
+  run ../git-open -f subdir/howdy.txt
+  assert_output "https://github.com/paulirish/git-open/tree/master/subdir/howdy.txt"
+}
+
 @test "basic: # and % in branch names are URL encoded" {
   # https://github.com/paulirish/git-open/pull/24
   git checkout -B "issue-#42"