[test] copy/adjust code from GH-150 to guard against regression(s)

Author: kares

src/test/ruby/x509/test_x509req.rb

@@ -37,4 +37,43 @@ def test_version
     assert_equal 1, req.version
   end
 
+  # from GH-150
+  def test_to_der_new_from_der; require 'base64'
+    # Build the CSR
+    key = OpenSSL::PKey::RSA.new TEST_KEY_RSA1024
+    request = OpenSSL::X509::Request.new
+    request.subject = OpenSSL::X509::Name.new([['CN', "common_name",  OpenSSL::ASN1::UTF8STRING]])
+    request.public_key = key.public_key
+    request.sign(key, OpenSSL::Digest::SHA1.new)
+    # One request is decoded from a `encode64` the other one is from `strict_encode64`
+    decoded = Base64.decode64(Base64.encode64(request.to_der))
+    strictly_decoded = Base64.decode64(Base64.strict_encode64(request.to_der))
+
+    # # Both strings are decoded identically
+    # decoded == strictly_decoded #=> true
+    # # .. even on byte level
+    # decoded.split(//) == strictly_decoded.split(//) #= true
+
+    OpenSSL::X509::Request.new(strictly_decoded) #=> #<OpenSSL::X509::Request:0x4f290f46>
+    OpenSSL::X509::Request.new(decoded) #=> OpenSSL::X509::RequestError: invalid certificate request data
+  end
+
+  TEST_KEY_RSA1024 = <<-_end_of_pem_
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
+  _end_of_pem_
+
 end