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diff --git a/spec/mspec/spec/guards/version_spec.rb b/spec/mspec/spec/guards/version_spec.rb
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+++ b/spec/mspec/spec/guards/version_spec.rb
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+require 'spec_helper'
+require 'mspec/guards'
+
+# The VersionGuard specifies a version of Ruby with a String of
+# the form: v = 'major.minor.tiny'.
+#
+# A VersionGuard instance can be created with a single String,
+# which means any version >= each component of v.
+# Or, the guard can be created with a Range, a..b, or a...b,
+# where a, b are of the same form as v. The meaning of the Range
+# is as typically understood: a..b means v >= a and v <= b;
+# a...b means v >= a and v < b.
+
+describe VersionGuard, "#match?" do
+  before :each do
+    hide_deprecation_warnings
+    stub_const "VersionGuard::FULL_RUBY_VERSION", SpecVersion.new('1.8.6')
+  end
+
+  it "returns true when the argument is equal to RUBY_VERSION" do
+    VersionGuard.new('1.8.6').match?.should == true
+  end
+
+  it "returns true when the argument is less than RUBY_VERSION" do
+    VersionGuard.new('1.8').match?.should == true
+    VersionGuard.new('1.8.5').match?.should == true
+  end
+
+  it "returns false when the argument is greater than RUBY_VERSION" do
+    VersionGuard.new('1.8.7').match?.should == false
+    VersionGuard.new('1.9.2').match?.should == false
+  end
+
+  it "returns true when the argument range includes RUBY_VERSION" do
+    VersionGuard.new('1.8.5'..'1.8.7').match?.should == true
+    VersionGuard.new('1.8'..'1.9').match?.should == true
+    VersionGuard.new('1.8'...'1.9').match?.should == true
+    VersionGuard.new('1.8'..'1.8.6').match?.should == true
+    VersionGuard.new('1.8.5'..'1.8.6').match?.should == true
+    VersionGuard.new(''...'1.8.7').match?.should == true
+  end
+
+  it "returns false when the argument range does not include RUBY_VERSION" do
+    VersionGuard.new('1.8.7'..'1.8.9').match?.should == false
+    VersionGuard.new('1.8.4'..'1.8.5').match?.should == false
+    VersionGuard.new('1.8.4'...'1.8.6').match?.should == false
+    VersionGuard.new('1.8.5'...'1.8.6').match?.should == false
+    VersionGuard.new(''...'1.8.6').match?.should == false
+  end
+end
+
+describe Object, "#ruby_version_is" do
+  before :each do
+    @guard = VersionGuard.new 'x.x.x'
+    VersionGuard.stub(:new).and_return(@guard)
+    ScratchPad.clear
+  end
+
+  it "yields when #match? returns true" do
+    @guard.stub(:match?).and_return(true)
+    ruby_version_is('x.x.x') { ScratchPad.record :yield }
+    ScratchPad.recorded.should == :yield
+  end
+
+  it "does not yield when #match? returns false" do
+    @guard.stub(:match?).and_return(false)
+    ruby_version_is('x.x.x') { ScratchPad.record :yield }
+    ScratchPad.recorded.should_not == :yield
+  end
+
+  it "sets the name of the guard to :ruby_version_is" do
+    ruby_version_is("") { }
+    @guard.name.should == :ruby_version_is
+  end
+
+  it "calls #unregister even when an exception is raised in the guard block" do
+    @guard.should_receive(:match?).and_return(true)
+    @guard.should_receive(:unregister)
+    lambda do
+      ruby_version_is("") { raise Exception }
+    end.should raise_error(Exception)
+  end
+end