RUBY-932 Add missing Topology::Unknown tests

Author: estolfo

spec/mongo/cluster/topology/unknown_spec.rb

@@ -0,0 +1,167 @@
+require 'spec_helper'
+
+describe Mongo::Cluster::Topology::Unknown do
+
+  let(:topology) do
+    described_class.new({})
+  end
+
+  describe '.servers' do
+
+    let(:servers) do
+      topology.servers([ double('mongos'), double('standalone') ])
+    end
+
+    it 'returns an empty array' do
+      expect(servers).to eq([ ])
+    end
+  end
+
+  describe '.replica_set?' do
+
+    it 'returns false' do
+      expect(topology).to_not be_replica_set
+    end
+  end
+
+  describe '.sharded?' do
+
+    it 'returns false' do
+      expect(topology).not_to be_sharded
+    end
+  end
+
+  describe '.single?' do
+
+    it 'returns false' do
+      expect(topology).not_to be_single
+    end
+  end
+
+  describe '.unknown?' do
+
+    it 'returns true' do
+      expect(topology.unknown?).to be(true)
+    end
+  end
+
+  describe '#add_hosts?' do
+
+    context 'when the description is from an unknown server' do
+
+      let(:description) do
+        double('description').tap do |d|
+          allow(d).to receive(:unknown?).and_return(true)
+        end
+      end
+
+      it 'returns false' do
+        expect(topology.add_hosts?(description, [])).to be(false)
+      end
+    end
+
+    context 'when the description is from a ghost server' do
+
+      let(:description) do
+        double('description').tap do |d|
+          allow(d).to receive(:unknown?).and_return(false)
+          allow(d).to receive(:ghost?).and_return(true)
+        end
+      end
+
+      it 'returns false' do
+        expect(topology.add_hosts?(description, [])).to be(false)
+      end
+    end
+
+    context 'when the description is not from an unknown or ghost' do
+
+      let(:description) do
+        double('description').tap do |d|
+          allow(d).to receive(:unknown?).and_return(false)
+          allow(d).to receive(:ghost?).and_return(false)
+        end
+      end
+
+      it 'returns true' do
+        expect(topology.add_hosts?(description, [])).to be(true)
+      end
+    end
+  end
+
+  describe '#remove_hosts?' do
+
+    context 'when the description is from a standalone' do
+
+      let(:description) do
+        double('description').tap do |d|
+          allow(d).to receive(:standalone?).and_return(true)
+        end
+      end
+
+      it 'returns true' do
+        expect(topology.remove_hosts?(description)).to be(true)
+      end
+    end
+
+    context 'when the description is not from a standalone' do
+
+      let(:description) do
+        double('description').tap do |d|
+          allow(d).to receive(:standalone?).and_return(false)
+        end
+      end
+
+      it 'returns true' do
+        expect(topology.remove_hosts?(description)).to be(false)
+      end
+    end
+  end
+
+  describe '#remove_server?' do
+
+     context 'when the description is from a standalone' do
+
+       let(:description) do
+         double('description').tap do |d|
+           allow(d).to receive(:standalone?).and_return(true)
+           allow(d).to receive(:is_server?).and_return(true)
+         end
+       end
+
+       context 'when the description is from the server in question' do
+
+         it 'returns true' do
+           expect(topology.remove_server?(description, double('server'))).to be(true)
+         end
+       end
+
+       context 'when the description is not from the server in question' do
+
+         let(:description) do
+           double('description').tap do |d|
+             allow(d).to receive(:standalone?).and_return(true)
+             allow(d).to receive(:is_server?).and_return(false)
+           end
+         end
+
+         it 'returns false' do
+           expect(topology.remove_server?(description, double('server'))).to be(false)
+         end
+       end
+     end
+
+    context 'when the description is not from a standalone' do
+
+      let(:description) do
+        double('description').tap do |d|
+          allow(d).to receive(:standalone?).and_return(false)
+        end
+      end
+
+      it 'returns false' do
+        expect(topology.remove_server?(description, double('server'))).to be(false)
+      end
+    end
+  end
+end