spice-protocol: add test

spice-protocol.rb

@@ -3,10 +3,24 @@ class SpiceProtocol < Formula
   homepage "https://www.spice-space.org/"
   url "https://www.spice-space.org/download/releases/spice-protocol-0.12.14.tar.bz2"
   sha256 "20350bc4309039fdf0d29ee4fd0033cde27bccf33501e13b3c1befafde9d0c9c"
+  revision 1
 
   def install
     system "./configure", "--disable-silent-rules",
                           "--prefix=#{prefix}"
     system "make", "install"
   end
+
+  test do
+    (testpath/"test.cpp").write <<~EOS
+      #include <spice/protocol.h>
+      int main() {
+        return (SPICE_LINK_ERR_OK == 0) ? 0 : 1;
+      }
+    EOS
+    system ENV.cc, "test.cpp",
+                   "-I#{include}/spice-1",
+                   "-o", "test"
+    system "./test"
+  end
 end