guests/linux: Add tests for halt capability

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

@@ -0,0 +1,36 @@
+require_relative "../../../../base"
+
+describe "VagrantPlugins::GuestLinux::Cap::Halt" do
+  let(:caps) do
+    VagrantPlugins::GuestLinux::Plugin
+      .components
+      .guest_capabilities[:linux]
+  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
+    let(:cap) { caps.get(:halt) }
+
+    it "runs the shutdown command" do
+      comm.expect_command("shutdown -h now")
+      cap.halt(machine)
+    end
+
+    it "does not raise an IOError" do
+      comm.stub_command("shutdown -h now", raise: IOError)
+      expect {
+        cap.halt(machine)
+      }.to_not raise_error
+    end
+  end
+end