diff --git a/Formula/ldns.rb b/Formula/ldns.rb
index ce9c943743..67ac1c2b0e 100644
--- a/Formula/ldns.rb
+++ b/Formula/ldns.rb
@@ -1,9 +1,7 @@
-require 'formula'
-
 class Ldns < Formula
-  homepage 'http://nlnetlabs.nl/projects/ldns/'
-  url 'http://nlnetlabs.nl/downloads/ldns/ldns-1.6.17.tar.gz'
-  sha1 '4218897b3c002aadfc7280b3f40cda829e05c9a4'
+  homepage "https://nlnetlabs.nl/projects/ldns/"
+  url "https://nlnetlabs.nl/downloads/ldns/ldns-1.6.17.tar.gz"
+  sha256 "8b88e059452118e8949a2752a55ce59bc71fa5bc414103e17f5b6b06f9bcc8cd"
   revision 1
 
   bottle do
@@ -14,22 +12,29 @@ class Ldns < Formula
   end
 
   depends_on :python => :optional
-  depends_on 'openssl'
-  depends_on 'swig' => :build if build.with? 'python'
+  depends_on "openssl"
+  depends_on "swig" => :build if build.with? "python"
 
   def install
     args = %W[
       --prefix=#{prefix}
       --with-drill
+      --with-examples
       --with-ssl=#{Formula["openssl"].opt_prefix}
     ]
 
-    args << "--with-pyldns" if build.with? 'python'
+    args << "--with-pyldns" if build.with? "python"
 
     system "./configure", *args
     system "make"
-    system "make install"
-    system "make", "install-pyldns" if build.with? 'python'
+    system "make", "install"
+    system "make", "install-pyldns" if build.with? "python"
     (lib/"pkgconfig").install "packaging/libldns.pc"
   end
+
+  test do
+    (testpath/"powerdns.com.dnskey").write("powerdns.com.   10773 IN  DNSKEY  256 3 8 AwEAAbQOlJUPNWM8DQown5y/wFgDVt7jskfEQcd4pbLV/1osuBfBNDZX v9ru7wDC/PbpvysEZgFXTPJ9QrdwSsd8KAZVO5mjeDNL0RnlhjHWuXKC qnLI+iLb3OMLQTizjdscdHPoW98wk5931pJkyf2qMDRjRB4c5d81sfoZ Od6D7Rrx\npowerdns.com.   10773 IN  DNSKEY  257 3 8 AwEAAb/+pXOZWYQ8mv9WM5dFva8WU9jcIUdDuEjldbyfnkQ/xlrJC5zA EfhYhrea3SmIPmMTDimLqbh3/4SMTNPTUF+9+U1vpNfIRTFadqsmuU9F ddz3JqCcYwEpWbReg6DJOeyu+9oBoIQkPxFyLtIXEPGlQzrynKubn04C x83I6NfzDTraJT3jLHKeW5PVc1ifqKzHz5TXdHHTA7NkJAa0sPcZCoNE 1LpnJI/wcUpRUiuQhoLFeT1E432GuPuZ7y+agElGj0NnBxEgnHrhrnZW UbULpRa/il+Cr5Taj988HqX9Xdm6FjcP4Lbuds/44U7U8du224Q8jTrZ 57Yvj4VDQKc=")
+    system "#{bin}/ldns-key2ds", "powerdns.com.dnskey"
+    assert_match /d4c3d5552b8679faeebc317e5f048b614b2e5f607dc57f1553182d49ab2179f7/, File.read("Kpowerdns.com.+008+44030.ds")
+  end
 end