guests/darwin: Add tests for get_addressable_ip_addr

plugins/guests/darwin/cap/choose_addressable_ip_addr.rb

@@ -3,16 +3,16 @@ module VagrantPlugins
     module Cap
       module ChooseAddressableIPAddr
         def self.choose_addressable_ip_addr(machine, possible)
-          machine.communicate.tap do |comm|
+          comm = machine.communicate
+
           possible.each do |ip|
-              command = "ping -c1 -t1 #{ip}"
-              if comm.test(command)
+            if comm.test("ping -c1 -t1 #{ip}")
               return ip
             end
           end
-          end
 
-          nil
+          # If we got this far, there are no addressable IPs
+          return nil
         end
       end
     end

test/unit/plugins/guests/darwin/cap/choose_addressable_ip_addr_test.rb

@@ -0,0 +1,36 @@
+require_relative "../../../../base"
+
+describe "VagrantPlugins::GuestDarwin::Cap::ChangeHostName" do
+  let(:described_class) do
+    VagrantPlugins::GuestDarwin::Plugin
+      .components
+      .guest_capabilities[:darwin]
+      .get(:choose_addressable_ip_addr)
+  end
+
+  let(:machine) { double("machine") }
+  let(:comm) { VagrantTests::DummyCommunicator::Communicator.new(machine) }
+
+  before do
+    allow(machine).to receive(:communicate).and_return(comm)
+  end
+
+  after do
+    comm.verify_expectations!
+  end
+
+  describe ".choose_addressable_ip_addr" do
+    let(:possible) { ["1.2.3.4", "5.6.7.8"] }
+
+    it "retrieves the value" do
+      comm.stub_command("ping -c1 -t1 5.6.7.8", exit_code: 0)
+      result = described_class.choose_addressable_ip_addr(machine, possible)
+      expect(result).to eq("5.6.7.8")
+    end
+
+    it "returns nil if no ips are found" do
+      result = described_class.choose_addressable_ip_addr(machine, [])
+      expect(result).to be(nil)
+    end
+  end
+end