diff --git a/plugins/guests/linux/cap/mount_smb_shared_folder.rb b/plugins/guests/linux/cap/mount_smb_shared_folder.rb
index bce106c6b..c0d1bf3f3 100644
--- a/plugins/guests/linux/cap/mount_smb_shared_folder.rb
+++ b/plugins/guests/linux/cap/mount_smb_shared_folder.rb
@@ -15,7 +15,7 @@ module VagrantPlugins
           mount_device   = "//#{options[:smb_host]}/#{name}"
 
           mount_options = options.fetch(:mount_options, [])
-          detected_ids = detect_owner_group_ids(machine, guest_path, mount_options, options)
+          detected_ids = detect_owner_group_ids(machine, guestpath, mount_options, options)
           mount_uid = detected_ids[:uid]
           mount_gid = detected_ids[:gid]
 
diff --git a/test/unit/plugins/guests/linux/cap/mount_smb_shared_folder.rb b/test/unit/plugins/guests/linux/cap/mount_smb_shared_folder.rb
new file mode 100644
index 000000000..cde67e6a6
--- /dev/null
+++ b/test/unit/plugins/guests/linux/cap/mount_smb_shared_folder.rb
@@ -0,0 +1,71 @@
+require_relative "../../../../base"
+
+describe "VagrantPlugins::GuestLinux::Cap::MountSMBSharedFolder" do
+  let(:caps) do
+    VagrantPlugins::GuestLinux::Plugin
+      .components
+      .guest_capabilities[:linux]
+  end
+
+  let(:machine) { double("machine") }
+  let(:guest) { double("guest") }
+  let(:comm) { VagrantTests::DummyCommunicator::Communicator.new(machine) }
+  let(:mount_owner){ "vagrant" }
+  let(:mount_group){ "vagrant" }
+  let(:mount_uid){ "1000" }
+  let(:mount_gid){ "1000" }
+  let(:mount_name){ "vagrant" }
+  let(:mount_guest_path){ "/vagrant" }
+  let(:folder_options) do
+    {
+      owner: mount_owner,
+      group: mount_group,
+      smb_host: "localhost",
+      smb_username: "user",
+      smb_password: "pass"
+    }
+  end
+  let(:cap){ caps.get(:mount_smb_shared_folder) }
+
+  before do
+    allow(machine).to receive(:communicate).and_return(comm)
+  end
+
+  after do
+    comm.verify_expectations!
+  end
+
+  describe ".mount_smb_shared_folder" do
+    before do
+      allow(comm).to receive(:sudo).with(any_args).and_return(0)
+      allow(comm).to receive(:execute).with(any_args)
+      allow(machine).to receive(:guest).and_return(guest)
+      allow(guest).to receive(:capability).with(:shell_expand_guest_path, mount_guest_path).and_return(mount_guest_path)
+    end
+
+    it "generates the expected default mount command" do
+      expect(comm).to receive(:sudo).with(/mount -t cifs/, anything).and_return(0)
+      cap.mount_smb_shared_folder(machine, mount_name, mount_guest_path, folder_options)
+    end
+
+    it "creates directory on guest machine" do
+      expect(comm).to receive(:sudo).with("mkdir -p #{mount_guest_path}")
+      cap.mount_smb_shared_folder(machine, mount_name, mount_guest_path, folder_options)
+    end
+
+    it "writes username into guest credentials file" do
+      expect(comm).to receive(:sudo).with(/smb_creds.*username=#{folder_options[:smb_username]}/m)
+      cap.mount_smb_shared_folder(machine, mount_name, mount_guest_path, folder_options)
+    end
+
+    it "writes password into guest credentials file" do
+      expect(comm).to receive(:sudo).with(/smb_creds.*password=#{folder_options[:smb_password]}/m)
+      cap.mount_smb_shared_folder(machine, mount_name, mount_guest_path, folder_options)
+    end
+
+    it "sends upstart notification after mount" do
+      expect(comm).to receive(:sudo).with(/emit/)
+      cap.mount_smb_shared_folder(machine, mount_name, mount_guest_path, folder_options)
+    end
+  end
+end