musepack: test added

Closes Homebrew/homebrew#37799.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/musepack.rb

@@ -1,18 +1,28 @@
-require 'formula'
-
 class Musepack < Formula
-  homepage 'http://www.musepack.net/'
-  url 'http://files.musepack.net/source/musepack_src_r475.tar.gz'
-  version 'r475'
-  sha1 'bdd4042773eb5c885df70d7a19914fa6e2306391'
+  homepage "https://www.musepack.net/"
+  url "http://files.musepack.net/source/musepack_src_r475.tar.gz"
+  version "r475"
+  sha256 "a4b1742f997f83e1056142d556a8c20845ba764b70365ff9ccf2e3f81c427b2b"
 
-  depends_on 'cmake' => :build
-  depends_on 'libcuefile'
-  depends_on 'libreplaygain'
+  depends_on "cmake" => :build
+  depends_on "libcuefile"
+  depends_on "libreplaygain"
+
+  resource "test-mpc" do
+    url "https://trac.ffmpeg.org/raw-attachment/ticket/1160/decodererror.mpc"
+    sha256 "b16d876b58810cdb7fc06e5f2f8839775efeffb9b753948a5a0f12691436a15c"
+  end
 
   def install
     system "cmake", ".", *std_cmake_args
-    system "make install"
-    lib.install 'libmpcdec/libmpcdec.dylib'
+    system "make", "install"
+    lib.install "libmpcdec/libmpcdec.dylib"
+  end
+
+  test do
+    resource("test-mpc").stage do
+      assert_match(/441001 samples decoded in/,
+                   shell_output("#{bin}/mpcdec decodererror.mpc 2>&1"))
+    end
   end
 end