guests/freebsd: Add tests to halt capability

plugins/guests/freebsd/cap/halt.rb

@@ -4,7 +4,7 @@ module VagrantPlugins
       class Halt
         def self.halt(machine)
           begin
-            machine.communicate.sudo("shutdown -p now", {shell: "sh"})
+            machine.communicate.sudo("shutdown -p now", { shell: "sh" })
           rescue IOError
             # Do nothing because SSH connection closed and it probably
             # means the VM just shut down really fast.

test/unit/plugins/guests/freebsd/cap/halt_test.rb

@@ -0,0 +1,35 @@
+require_relative "../../../../base"
+
+describe "VagrantPlugins::GuestFreeBSD::Cap::Halt" do
+  let(:described_class) do
+    VagrantPlugins::GuestFreeBSD::Plugin
+      .components
+      .guest_capabilities[:freebsd]
+      .get(:halt)
+  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 ".halt" do
+    it "runs the shutdown command" do
+      comm.expect_command("shutdown -p now")
+      described_class.halt(machine)
+    end
+
+    it "does not raise an IOError" do
+      comm.stub_command("shutdown -p now", raise: IOError)
+      expect {
+        described_class.halt(machine)
+      }.to_not raise_error
+    end
+  end
+end