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diff --git a/src/ruby/spec/server_credentials_spec.rb b/src/ruby/spec/server_credentials_spec.rb
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+++ b/src/ruby/spec/server_credentials_spec.rb
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+# Copyright 2014, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+require 'grpc'
+
+def load_test_certs
+  test_root = File.join(File.dirname(__FILE__), 'testdata')
+  files = ['ca.pem', 'server1.pem', 'server1.key']
+  files.map { |f| File.open(File.join(test_root, f)).read }
+end
+
+
+describe GRPC::Core::ServerCredentials do
+
+  Creds = GRPC::Core::ServerCredentials
+
+  describe '#new' do
+
+    it 'can be constructed from a fake CA PEM, server PEM and a server key' do
+      expect { Creds.new('a', 'b', 'c') }.not_to raise_error
+    end
+
+    it 'can be constructed using the test certificates' do
+      certs = load_test_certs
+      expect { Creds.new(*certs) }.not_to raise_error
+    end
+
+    it 'cannot be constructed without a server cert chain' do
+      root_cert, server_key, _ = load_test_certs
+      blk = Proc.new { Creds.new(root_cert, server_key, nil) }
+      expect(&blk).to raise_error
+    end
+
+    it 'cannot be constructed without a server key' do
+      root_cert, server_key, _ = load_test_certs
+      blk = Proc.new { Creds.new(root_cert, _, cert_chain) }
+      expect(&blk).to raise_error
+    end
+
+    it 'can be constructed without a root_cret' do
+      _, server_key, cert_chain = load_test_certs
+      blk = Proc.new { Creds.new(_, server_key, cert_chain) }
+      expect(&blk).to_not raise_error
+    end
+
+  end
+
+end