svg2pdf: test added

Closes Homebrew/homebrew#38289.

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

Formula/svg2pdf.rb

@@ -1,17 +1,28 @@
-require 'formula'
-
 class Svg2pdf < Formula
-  homepage 'http://cairographics.org/'
-  url 'http://cairographics.org/snapshots/svg2pdf-0.1.3.tar.gz'
-  sha1 '07c5e8b95b43bcdd40d791ccb1a2cb5221093f19'
+  homepage "http://cairographics.org/"
+  url "http://cairographics.org/snapshots/svg2pdf-0.1.3.tar.gz"
+  sha256 "854a870722a9d7f6262881e304a0b5e08a1c61cecb16c23a8a2f42f2b6a9406b"
 
-  depends_on 'pkg-config' => :build
-  depends_on 'libsvg-cairo'
+  depends_on "pkg-config" => :build
+  depends_on "libsvg-cairo"
+
+  resource("svg.svg") do
+    url "https://raw.githubusercontent.com/mathiasbynens/small/master/svg.svg"
+    sha256 "900fbe934249ad120004bd24adf66aad8817d89586273c0cc50e187bddebb601"
+  end
 
   def install
-    system "./configure", "--disable-debug", "--disable-dependency-tracking",
+    system "./configure", "--disable-debug",
+                          "--disable-dependency-tracking",
                           "--prefix=#{prefix}",
                           "--mandir=#{man}"
-    system "make install"
+    system "make", "install"
+  end
+
+  test do
+    resource("svg.svg").stage do
+      system "#{bin}/svg2pdf", "svg.svg", "test.pdf"
+      assert File.exist? "test.pdf"
+    end
   end
 end