diff --git a/test/unit/vagrant/shared_helpers_test.rb b/test/unit/vagrant/shared_helpers_test.rb
new file mode 100644
index 000000000..b3d2098a8
--- /dev/null
+++ b/test/unit/vagrant/shared_helpers_test.rb
@@ -0,0 +1,50 @@
+require File.expand_path("../../base", __FILE__)
+
+require "vagrant/shared_helpers"
+require "vagrant/util/platform"
+
+describe Vagrant do
+  include_context "unit"
+
+  subject { described_class }
+
+  describe "#user_data_path" do
+    around do |example|
+      env = {
+        "USERPROFILE" => nil,
+        "VAGRANT_HOME" => nil,
+      }
+      with_temp_env(env) { example.run }
+    end
+
+    it "defaults to ~/.vagrant.d" do
+      expect(subject.user_data_path).to eql(Pathname.new("~/.vagrant.d").expand_path)
+    end
+
+    it "is VAGRANT_HOME if set" do
+      with_temp_env("VAGRANT_HOME" => "/foo") do
+        expected = Pathname.new("/foo").expand_path
+        expect(subject.user_data_path).to eql(expected)
+      end
+    end
+
+    it "is USERPROFILE/.vagrant.d if set" do
+      with_temp_env("USERPROFILE" => "/bar") do
+        expected = Pathname.new("/bar/.vagrant.d").expand_path
+        expect(subject.user_data_path).to eql(expected)
+      end
+    end
+
+    it "prefers VAGRANT_HOME over USERPOFILE if both are set" do
+      env = {
+        "USERPROFILE" => "/bar",
+        "VAGRANT_HOME" => "/foo",
+      }
+
+      with_temp_env(env) do
+        expected = Pathname.new("/foo").expand_path
+        expect(subject.user_data_path).to eql(expected)
+      end
+    end
+  end
+end