lrzip: add test

Closes Homebrew/homebrew#28461.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/lrzip.rb

@@ -14,4 +14,18 @@ class Lrzip < Formula
     system "make"
     system "make install"
   end
+
+  test do
+    path = testpath/"data.txt"
+    original_contents = "." * 1000
+    path.write original_contents
+
+    # compress: data.txt -> data.txt.lrz
+    system bin/"lrzip", "-o", "#{path}.lrz", path
+    path.unlink
+
+    # decompress: data.txt.lrz -> data.txt
+    system bin/"lrzip", "-d", "#{path}.lrz"
+    assert_equal original_contents, path.read
+  end
 end