transferred Code Ocean from original repository to GitHub

spec/lib/port_pool_spec.rb

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+require 'rails_helper'
+
+describe PortPool do
+  describe '.available_port' do
+    it 'is synchronized' do
+      expect(PortPool.instance_variable_get(:@mutex)).to receive(:synchronize)
+      PortPool.available_port
+    end
+
+    context 'when a port is available' do
+      it 'returns the port' do
+        expect(PortPool.available_port).to be_a(Numeric)
+      end
+
+      it 'removes the port from the list of available ports' do
+        port = PortPool.available_port
+        expect(PortPool.instance_variable_get(:@available_ports)).not_to include(port)
+      end
+    end
+
+    context 'when no port is available' do
+      it 'returns the port' do
+        available_ports = PortPool.instance_variable_get(:@available_ports)
+        PortPool.instance_variable_set(:@available_ports, [])
+        expect(PortPool.available_port).to be_nil
+        PortPool.instance_variable_set(:@available_ports, available_ports)
+      end
+    end
+  end
+
+  describe '.release' do
+    context 'when the port has been obtained earlier' do
+      it 'adds the port to the list of available ports' do
+        port = PortPool.available_port
+        expect(PortPool.instance_variable_get(:@available_ports)).not_to include(port)
+        PortPool.release(port)
+        expect(PortPool.instance_variable_get(:@available_ports)).to include(port)
+      end
+    end
+
+    context 'when the port has not been obtained earlier' do
+      it 'does not add the port to the list of available ports' do
+        port = PortPool.instance_variable_get(:@available_ports).sample
+        expect { PortPool.release(port) }.not_to change { PortPool.instance_variable_get(:@available_ports).length }
+      end
+    end
+
+    context 'when the port is not included in the port range' do
+      it 'does not add the port to the list of available ports' do
+        port = nil
+        expect { PortPool.release(port) }.not_to change { PortPool.instance_variable_get(:@available_ports).length }
+      end
+    end
+  end
+end