diff --git a/lib/rex/proto/kerberos/client.rb b/lib/rex/proto/kerberos/client.rb
index 5b223235ee..603c5b0fac 100644
--- a/lib/rex/proto/kerberos/client.rb
+++ b/lib/rex/proto/kerberos/client.rb
@@ -26,8 +26,6 @@ module Rex
         attr_accessor :context
 
         def initialize(opts = {})
-          puts "rex"
-          pp opts
           self.host = opts[:host]
           self.port     = (opts[:port] || 88).to_i
           self.timeout  = (opts[:timeout] || 10).to_i
diff --git a/modules/auxiliary/admin/kerberos/kerberos_test.rb b/modules/auxiliary/admin/kerberos/kerberos_test.rb
index f1593215d6..b406fb251e 100644
--- a/modules/auxiliary/admin/kerberos/kerberos_test.rb
+++ b/modules/auxiliary/admin/kerberos/kerberos_test.rb
@@ -42,7 +42,6 @@ include Msf::Kerberos::Microsoft::Client
 		connect(:rhost => datastore['RHOST'])
     print_status("Sending AS-REQ...")
 		res = send_request_as(opts)
-		print_status("#{res.inspect}")
 
     unless res.msg_type == 11
       print_error("invalid response :(")
diff --git a/spec/lib/rex/proto/kerberos/client_spec.rb b/spec/lib/rex/proto/kerberos/client_spec.rb
new file mode 100644
index 0000000000..ea15bea8e7
--- /dev/null
+++ b/spec/lib/rex/proto/kerberos/client_spec.rb
@@ -0,0 +1,158 @@
+# -*- coding:binary -*-
+require 'spec_helper'
+
+require 'stringio'
+require 'rex/proto/kerberos'
+
+class MyStringIO < StringIO
+  def put(data)
+    write(data)
+  end
+
+  def get_once(length, timeout = 10)
+    read(length)
+  end
+end
+
+describe Rex::Proto::Kerberos::Client do
+  before :each do
+    allow(Rex::Socket::Tcp).to receive(:create) do
+      s = ''
+      io = MyStringIO.new(s, 'w+b')
+      io
+    end
+  end
+
+  subject(:client) do
+    described_class.new
+  end
+
+  let(:sample_asn1_request) do
+    "\x6a\x82\x01\x08\x30\x82\x01\x04\xa1\x03\x02\x01" +
+    "\x05\xa2\x03\x02\x01\x0a\xa3\x5f\x30\x5d\x30\x48\xa1\x03\x02\x01" +
+    "\x02\xa2\x41\x04\x3f\x30\x3d\xa0\x03\x02\x01\x17\xa2\x36\x04\x34" +
+    "\x60\xae\x53\xa5\x0b\x56\x2e\x46\x61\xd9\xd6\x89\x98\xfc\x79\x9d" +
+    "\x45\x73\x7d\x0d\x8a\x78\x84\x4d\xd7\x7c\xc6\x50\x08\x8d\xab\x22" +
+    "\x79\xc3\x8d\xd3\xaf\x9f\x5e\xb7\xb8\x9b\x57\xc5\xc9\xc5\xea\x90" +
+    "\x89\xc3\x63\x58\x30\x11\xa1\x04\x02\x02\x00\x80\xa2\x09\x04\x07" +
+    "\x30\x05\xa0\x03\x01\x01\x00\xa4\x81\x96\x30\x81\x93\xa0\x07\x03" +
+    "\x05\x00\x50\x80\x00\x00\xa1\x11\x30\x0f\xa0\x03\x02\x01\x01\xa1" +
+    "\x08\x30\x06\x1b\x04\x6a\x75\x61\x6e\xa2\x0c\x1b\x0a\x44\x45\x4d" +
+    "\x4f\x2e\x4c\x4f\x43\x41\x4c\xa3\x1f\x30\x1d\xa0\x03\x02\x01\x01" +
+    "\xa1\x16\x30\x14\x1b\x06\x6b\x72\x62\x74\x67\x74\x1b\x0a\x44\x45" +
+    "\x4d\x4f\x2e\x4c\x4f\x43\x41\x4c\xa4\x11\x18\x0f\x31\x39\x37\x30" +
+    "\x30\x31\x30\x31\x30\x30\x30\x30\x30\x30\x5a\xa5\x11\x18\x0f\x31" +
+    "\x39\x37\x30\x30\x31\x30\x31\x30\x30\x30\x30\x30\x30\x5a\xa6\x11" +
+    "\x18\x0f\x31\x39\x37\x30\x30\x31\x30\x31\x30\x30\x30\x30\x30\x30" +
+    "\x5a\xa7\x06\x02\x04\x18\xf4\x10\x2c\xa8\x05\x30\x03\x02\x01\x17"
+  end
+
+  let(:req_length) do
+    272
+  end
+
+  let(:res_invalid) do
+    'ABCDEF'
+  end
+
+  let(:res_valid) do
+    "\x00\x00\x02\x57\x6b\x82\x02\x53\x30\x82\x02\x4f\xa0\x03\x02\x01" +
+    "\x05\xa1\x03\x02\x01\x0b\xa3\x0c\x1b\x0a\x44\x45\x4d\x4f\x2e\x4c" +
+    "\x4f\x43\x41\x4c\xa4\x11\x30\x0f\xa0\x03\x02\x01\x01\xa1\x08\x30" +
+    "\x06\x1b\x04\x6a\x75\x61\x6e\xa5\x82\x01\x10\x61\x82\x01\x0c\x30" +
+    "\x82\x01\x08\xa0\x03\x02\x01\x05\xa1\x0c\x1b\x0a\x44\x45\x4d\x4f" +
+    "\x2e\x4c\x4f\x43\x41\x4c\xa2\x1f\x30\x1d\xa0\x03\x02\x01\x01\xa1" +
+    "\x16\x30\x14\x1b\x06\x6b\x72\x62\x74\x67\x74\x1b\x0a\x44\x45\x4d" +
+    "\x4f\x2e\x4c\x4f\x43\x41\x4c\xa3\x81\xd1\x30\x81\xce\xa0\x03\x02" +
+    "\x01\x17\xa1\x03\x02\x01\x02\xa2\x81\xc1\x04\x81\xbe\x78\xce\x09" +
+    "\x63\x22\x20\x46\xe0\x86\x82\x2f\x2e\x02\x6e\xf8\x09\xd4\xd4\x87" +
+    "\x82\xa6\x5d\xbe\x6e\x75\x65\xd4\xc7\x7e\x71\xaf\xc9\xb5\x00\x7c" +
+    "\x57\x0a\xca\x9a\xb1\x3c\xda\x4e\x47\x24\x96\x11\xb6\x54\x86\x0f" +
+    "\xf0\x85\x54\xf0\x47\x88\xa4\x31\xc9\xe4\x7c\x43\x7c\xe7\x54\x9b" +
+    "\xf4\x06\xfe\x86\xd2\x5c\x1b\x6c\xe8\x30\xa6\x51\xb3\x2e\xf6\x45" +
+    "\x54\x3c\x52\x70\xb8\xc6\x31\x4c\x49\x57\xb7\xd6\x16\x11\x70\x77" +
+    "\x4f\x3d\x40\x96\xfc\xb9\x9c\x6a\x4b\x55\x94\x52\x99\x6a\xcb\xf3" +
+    "\x85\x1d\xf8\xa7\x0b\xe4\x34\xa6\x35\x8b\x27\x9d\x70\x4d\xc6\xdf" +
+    "\xca\x70\x65\x10\x84\x1d\x23\xf7\xea\xf7\xef\x67\x02\x68\xe4\xab" +
+    "\x94\x22\x8f\x18\xab\x3b\x57\x85\x23\xa0\xdd\xc9\x60\x01\x24\x8f" +
+    "\xf7\x3d\x82\xc8\x9b\xdd\x9e\xc8\xeb\xa7\xf8\xb0\xc4\x72\x93\x8c" +
+    "\xed\xf1\xf6\x49\x96\xab\x61\x78\xcd\x75\x04\xa6\x82\x01\x0c\x30" +
+    "\x82\x01\x08\xa0\x03\x02\x01\x17\xa1\x03\x02\x01\x01\xa2\x81\xfb" +
+    "\x04\x81\xf8\x7c\x0f\x86\x51\xdb\x1b\x09\x86\xfa\x68\xe4\xea\x2f" +
+    "\xcb\xfd\x92\x88\x76\x00\x0d\x47\x78\xcc\xfb\x1a\x37\x3a\x89\x54" +
+    "\x08\x71\x5b\xdf\xe1\xe5\xac\xe0\xa7\xda\xeb\xe1\xbf\x67\x91\xa3" +
+    "\xbc\xb5\x02\x53\xf7\xdb\x90\x5d\x9b\xb2\x28\xdb\x37\x25\xab\xc2" +
+    "\x1f\x49\x71\xaf\x4c\x00\x8b\xda\x8d\x35\x26\x88\xc5\xa7\xe8\x79" +
+    "\x3e\x10\xb7\xe0\xc9\x77\x71\x10\x74\x05\xc2\x85\x1a\x56\x05\xa0" +
+    "\x22\x38\x7d\x6e\xeb\x3c\xa9\xc1\x4a\x50\x3f\x33\x12\x76\x28\x56" +
+    "\x8e\xf8\x9e\x77\x62\x9c\xe5\xfe\x4b\xb2\x03\xdb\x6f\x44\x5f\x0e" +
+    "\x2b\xa7\x20\x39\xd8\x5e\xb2\x41\xff\x5d\xe4\xa1\x8f\x7c\x47\x4b" +
+    "\xae\x5a\x2f\xc2\x07\xdd\xbb\x12\xcf\xe3\xbd\x6c\xef\x49\x4a\xf7" +
+    "\x25\x8a\x7b\xfa\xaf\x22\x33\x31\xbb\xc7\xdd\x17\x5c\xe3\x19\xc0" +
+    "\xa0\x18\xba\xcf\xa9\xcf\xd0\x21\xd9\x68\xa8\x2f\x43\x63\x0c\x60" +
+    "\x3b\x66\xbe\xe1\xa1\x9f\xba\xac\x05\xa3\xad\x28\xc5\xfc\x80\x8a" +
+    "\x3d\x24\xa8\x2e\x8e\xc5\x06\x4b\xbc\x79\x1e\x41\x2c\x47\x6c\x3e" +
+    "\x50\x59\x25\xc0\xe5\x94\xee\x38\xca\x09\x8c\xe1\x43\x87\xa7\x34" +
+    "\xa6\x7c\x0f\xe4\xcb\x1c\xf6\xb4\xa3\xc7\x6e"
+  end
+
+  let(:res_error) do
+    "\x00\x00\x00\x8f\x7e\x81\x8c\x30\x81\x89\xa0\x03\x02\x01\x05\xa1" +
+    "\x03\x02\x01\x1e\xa4\x11\x18\x0f\x32\x30\x31\x34\x31\x32\x31\x39" +
+    "\x31\x38\x30\x35\x30\x33\x5a\xa5\x04\x02\x02\x51\x89\xa6\x03\x02" +
+    "\x01\x18\xa9\x0c\x1b\x0a\x44\x45\x4d\x4f\x2e\x4c\x4f\x43\x41\x4c" +
+    "\xaa\x1f\x30\x1d\xa0\x03\x02\x01\x01\xa1\x16\x30\x14\x1b\x06\x6b" +
+    "\x72\x62\x74\x67\x74\x1b\x0a\x44\x45\x4d\x4f\x2e\x4c\x4f\x43\x41" +
+    "\x4c\xac\x30\x04\x2e\x30\x2c\x30\x16\xa1\x03\x02\x01\x0b\xa2\x0f" +
+    "\x04\x0d\x30\x0b\x30\x09\xa0\x03\x02\x01\x17\xa1\x02\x04\x00\x30" +
+    "\x12\xa1\x03\x02\x01\x13\xa2\x0b\x04\x09\x30\x07\x30\x05\xa0\x03" +
+    "\x02\x01\x17"
+  end
+
+  describe "#send_request" do
+    context "when TCP connection" do
+      it "returns the written data length" do
+        request = Rex::Proto::Kerberos::Model::KdcRequest.decode(sample_asn1_request)
+        expect(subject.send_request(request)).to eq(req_length)
+      end
+    end
+  end
+
+  describe "#recv_response" do
+    context "when no connection" do
+      it "raises RunitmeError" do
+        expect { subject.recv_response }.to raise_error(::RuntimeError)
+      end
+    end
+
+    context "when TCP connection" do
+      context "when reads a kerberos error" do
+        it "returns a Rex::Proto::Kerberos::Model::KrbError" do
+          subject.connect
+          subject.connection.write(res_error)
+          subject.connection.seek(0)
+          expect(subject.recv_response).to be_a(Rex::Proto::Kerberos::Model::KrbError)
+        end
+      end
+
+      context "when reads a Kerberos response" do
+        it "returns a Rex::Proto::Kerberos::Model::KdcResponse" do
+          subject.connect
+          subject.connection.write(res_valid)
+          subject.connection.seek(0)
+          expect(subject.recv_response).to be_a(Rex::Proto::Kerberos::Model::KdcResponse)
+        end
+      end
+
+      context "when reads unexpected data" do
+        it "raises RuntimeError" do
+          subject.connect
+          subject.connection.write(res_invalid)
+          subject.connection.seek(0)
+          expect { subject.recv_response }.to raise_error(::RuntimeError)
+        end
+      end
+    end
+  end
+end
+