lzop: test added

Closes Homebrew/homebrew#38584.

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

Formula/lzop.rb

@@ -1,15 +1,26 @@
-require 'formula'
-
 class Lzop < Formula
-  homepage 'http://www.lzop.org/'
-  url 'http://www.lzop.org/download/lzop-1.03.tar.gz'
-  sha1 '4ee0b49b2a6b0a13572ddca5785ee48ef4c8f80f'
+  homepage "http://www.lzop.org/"
+  url "http://www.lzop.org/download/lzop-1.03.tar.gz"
+  sha256 "c1425b8c77d49f5a679d5a126c90ea6ad99585a55e335a613cae59e909dbb2c9"
 
-  depends_on 'lzo'
+  depends_on "lzo"
 
   def install
     system "./configure", "--disable-dependency-tracking",
                           "--prefix=#{prefix}"
-    system "make install"
+    system "make", "install"
+  end
+
+  test do
+    path = testpath/"test"
+    text = "This is Homebrew"
+    path.write text
+
+    system "#{bin}/lzop", "test"
+    assert File.exist?("test.lzo")
+    rm path
+
+    system "#{bin}/lzop", "-d", "test.lzo"
+    assert_equal text, path.read
   end
 end