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diff --git a/src/ruby/spec/generic/interceptor_registry_spec.rb b/src/ruby/spec/generic/interceptor_registry_spec.rb
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+++ b/src/ruby/spec/generic/interceptor_registry_spec.rb
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+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+require 'spec_helper'
+
+describe GRPC::InterceptorRegistry do
+  let(:server) { RpcServer.new }
+  let(:interceptor) { TestServerInterceptor.new }
+  let(:interceptors) { [interceptor] }
+  let(:registry) { described_class.new(interceptors) }
+
+  describe 'initialization' do
+    subject { registry }
+
+    context 'with an interceptor extending GRPC::ServerInterceptor' do
+      it 'should add the interceptor to the registry' do
+        subject
+        is = registry.instance_variable_get('@interceptors')
+        expect(is.count).to eq 1
+        expect(is.first).to eq interceptor
+      end
+    end
+
+    context 'with multiple interceptors' do
+      let(:interceptor2) { TestServerInterceptor.new }
+      let(:interceptor3) { TestServerInterceptor.new }
+      let(:interceptors) { [interceptor, interceptor2, interceptor3] }
+
+      it 'should maintain order of insertion when iterated against' do
+        subject
+        is = registry.instance_variable_get('@interceptors')
+        expect(is.count).to eq 3
+        is.each_with_index do |i, idx|
+          case idx
+          when 0
+            expect(i).to eq interceptor
+          when 1
+            expect(i).to eq interceptor2
+          when 2
+            expect(i).to eq interceptor3
+          end
+        end
+      end
+    end
+
+    context 'with an interceptor not extending GRPC::ServerInterceptor' do
+      let(:interceptor) { Class }
+      let(:err) { GRPC::InterceptorRegistry::DescendantError }
+
+      it 'should raise an InvalidArgument exception' do
+        expect { subject }.to raise_error(err)
+      end
+    end
+  end
+end