git-url-sub: head & test added

Closes Homebrew/homebrew#39656.

Signed-off-by: Xu Cheng <xucheng@me.com>

Formula/git-url-sub.rb

@@ -1,11 +1,18 @@
-require 'formula'
-
 class GitUrlSub < Formula
-  homepage 'http://gosuri.github.io/git-url-sub'
-  url 'https://github.com/gosuri/git-url-sub/archive/1.0.1.tar.gz'
-  sha1 '294631d898a4263285f7a2ac0ce93ff494dadbf8'
+  homepage "https://gosuri.github.io/git-url-sub"
+  url "https://github.com/gosuri/git-url-sub/archive/1.0.1.tar.gz"
+  sha256 "6c943b55087e786e680d360cb9e085d8f1d7b9233c88e8f2e6a36f8e598a00a9"
+
+  head "https://github.com/gosuri/git-url-sub.git"
 
   def install
     system "make", "install", "PREFIX=#{prefix}"
   end
+
+  test do
+    system "git", "init"
+    system "git", "remote", "add", "origin", "foo"
+    system "#{bin}/git-url-sub", "-c", "foo", "bar"
+    assert_match(/origin\s+bar \(fetch\)/, shell_output("git remote -v"))
+  end
 end