Added spec to test the ssh key file permission changing.

test/unit/vagrant/ssh_test.rb

@@ -0,0 +1,25 @@
+require File.expand_path("../../base", __FILE__)
+
+describe Vagrant::SSH do
+  context "check_key_permissions" do
+    let(:key_path) { File.expand_path("../id_rsa", __FILE__) }
+    let(:ssh_instance) { Vagrant::SSH.new(double) }
+
+    before(:each) do
+      File.open(key_path, 'w') do |file|
+        file.write("hello!")
+      end
+      File.chmod(644, key_path)
+    end
+
+    after(:each) do
+      FileUtils.rm(key_path)
+    end
+
+    it "should not raise an exception if we set a keyfile permission correctly" do
+      ssh_instance.check_key_permissions(key_path)
+    end
+    
+  end
+end
+