diff --git a/test/unit/vagrant/util/numeric_test.rb b/test/unit/vagrant/util/numeric_test.rb
new file mode 100644
index 000000000..b13e4f9eb
--- /dev/null
+++ b/test/unit/vagrant/util/numeric_test.rb
@@ -0,0 +1,21 @@
+require File.expand_path("../../../base", __FILE__)
+
+require "vagrant/util/numeric"
+
+describe Vagrant::Util::Numeric do
+  include_context "unit"
+  before(:each) { described_class.reset! }
+  subject { described_class }
+
+  describe "#string_to_bytes" do
+    it "converts a string to the proper bytes" do
+      bytes = subject.string_to_bytes("10KB")
+      expect(bytes).to eq(10240)
+    end
+
+    it "returns nil if the given string is the wrong format" do
+      bytes = subject.string_to_bytes("10 Kilobytes")
+      expect(bytes).to eq(nil)
+    end
+  end
+end