diff --git a/test/unit/plugins/hosts/darwin/cap/smb_test.rb b/test/unit/plugins/hosts/darwin/cap/smb_test.rb
new file mode 100644
index 000000000..dbe653978
--- /dev/null
+++ b/test/unit/plugins/hosts/darwin/cap/smb_test.rb
@@ -0,0 +1,68 @@
+require_relative "../../../../base"
+
+require_relative "../../../../../../plugins/hosts/darwin/cap/smb"
+
+describe VagrantPlugins::HostDarwin::Cap::SMB do
+  let(:subject){ VagrantPlugins::HostDarwin::Cap::SMB }
+  let(:machine){ double(:machine) }
+  let(:env){ double(:env) }
+  let(:options){ {} }
+  let(:result){ Vagrant::Util::Subprocess::Result }
+
+  before{ allow(subject).to receive(:machine_id).and_return("CUSTOM_ID") }
+
+  describe ".smb_installed" do
+    it "is installed if sharing binary exists" do
+      expect(File).to receive(:exist?).with("/usr/sbin/sharing").and_return(true)
+      expect(subject.smb_installed(nil)).to be(true)
+    end
+
+    it "is not installed if sharing binary does not exist" do
+      expect(File).to receive(:exist?).with("/usr/sbin/sharing").and_return(false)
+      expect(subject.smb_installed(nil)).to be(false)
+    end
+  end
+
+  describe ".smb_cleanup" do
+    after{ subject.smb_cleanup(env, machine, options) }
+
+    it "should search for shares with generated machine ID" do
+      expect(Vagrant::Util::Subprocess).to receive(:execute).with(
+        anything, anything, /.*CUSTOM_ID.*/).and_return(result.new(0, "", ""))
+    end
+
+    it "should remove shares individually" do
+      expect(Vagrant::Util::Subprocess).to receive(:execute).
+        with(anything, anything, /.*CUSTOM_ID.*/).
+        and_return(result.new(0, "vgt-CUSTOM_ID-1\nvgt-CUSTOM_ID-2\n", ""))
+      expect(Vagrant::Util::Subprocess).to receive(:execute).with(/sudo/, /sharing/, anything, /CUSTOM_ID/).
+        twice.and_return(result.new(0, "", ""))
+    end
+  end
+
+  describe ".smb_prepare" do
+    let(:folders){ {"/first/path" => {hostpath: "/first/host", smb_id: "ID1"},
+      "/second/path" => {hostpath: "/second/host"}} }
+    before{ allow(Vagrant::Util::Subprocess).to receive(:execute).and_return(result.new(0, "", "")) }
+    it "should provide ID value if not set" do
+      subject.smb_prepare(env, machine, folders, options)
+      expect(folders["/second/path"][:smb_id]).to start_with("vgt-")
+    end
+
+    it "should not modify ID if already set" do
+      subject.smb_prepare(env, machine, folders, options)
+      expect(folders["/first/path"][:smb_id]).to eq("ID1")
+    end
+
+    it "should raise error when sharing command fails" do
+      expect(Vagrant::Util::Subprocess).to receive(:execute).and_return(result.new(1, "", ""))
+      expect{ subject.smb_prepare(env, machine, folders, options) }.to raise_error(
+        VagrantPlugins::SyncedFolderSMB::Errors::DefineShareFailed)
+    end
+
+    it "should add shares individually" do
+      expect(Vagrant::Util::Subprocess).to receive(:execute).with(/sudo/, any_args).twice.and_return(result.new(0, "", ""))
+      subject.smb_prepare(env, machine, folders, options)
+    end
+  end
+end