provider/virtualbox: fix NFS tests on Windows

lib/vagrant/util/platform.rb

@@ -58,7 +58,7 @@ module Vagrant
 
         # This expands the path and ensures proper casing of each part
         # of the path.
-        def fs_real_path(path)
+        def fs_real_path(path, **opts)
           path = Pathname.new(File.expand_path(path))
 
           if path.exist? && !fs_case_sensitive?

test/unit/plugins/providers/virtualbox/action/prepare_nfs_settings_test.rb

@@ -1,31 +1,27 @@
 require_relative "../base"
 
+require "vagrant/util/platform"
+
 describe VagrantPlugins::ProviderVirtualBox::Action::PrepareNFSSettings do
   include_context "unit"
   include_context "virtualbox"
 
-  let(:machine) {
-    environment                    = Vagrant::Environment.new
-    provider                       = :virtualbox
-    provider_cls, provider_options = Vagrant.plugin("2").manager.providers[provider]
-    provider_config                = Vagrant.plugin("2").manager.provider_configs[provider]
+  let(:iso_env) do
+    # We have to create a Vagrantfile so there is a root path
+    env = isolated_environment
+    env.vagrantfile("")
+    env.create_vagrant_env
+  end
 
-    Vagrant::Machine.new(
-      'test_machine',
-      provider,
-      provider_cls,
-      provider_config,
-      provider_options,
-      environment.config_global,
-      Pathname('data_dir'),
-      double('box'),
-      environment
-    )
-  }
+  let(:machine) do
+    iso_env.machine(iso_env.machine_names[0], :dummy).tap do |m|
+      m.provider.stub(driver: driver)
+    end
+  end
 
   let(:env)    {{ machine: machine }}
   let(:app)    { lambda { |*args| }}
-  let(:driver) { env[:machine].provider.driver }
+  let(:driver) { double("driver") }
 
   subject { described_class.new(app, env) }
 
@@ -41,7 +37,10 @@ describe VagrantPlugins::ProviderVirtualBox::Action::PrepareNFSSettings do
 
   context "with an nfs synced folder" do
     before do
-      env[:machine].config.vm.synced_folder("/host/path", "/guest/path", nfs: true)
+      # We can't be on Windows, because NFS gets disabled on Windows
+      Vagrant::Util::Platform.stub(windows?: false)
+
+      env[:machine].config.vm.synced_folder("/host/path", "/guest/path", type: "nfs")
       env[:machine].config.finalize!
 
       # Stub out the stuff so it just works by default