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diff --git a/spec/rubyspec/library/matrix/round_spec.rb b/spec/rubyspec/library/matrix/round_spec.rb
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+++ b/spec/rubyspec/library/matrix/round_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require 'matrix'
+
+describe "Matrix#round" do
+  it "returns a matrix with all entries rounded" do
+    Matrix[ [1,   2.34], [5.67, 8] ].round.should == Matrix[ [1, 2], [6, 8] ]
+    Matrix[ [1,   2.34], [5.67, 8] ].round(1).should == Matrix[ [1, 2.3], [5.7, 8] ]
+  end
+
+  it "returns empty matrices on the same size if empty" do
+    Matrix.empty(0, 3).round.should == Matrix.empty(0, 3)
+    Matrix.empty(3, 0).round(42).should == Matrix.empty(3, 0)
+  end
+
+  describe "for a subclass of Matrix" do
+    it "returns an instance of that subclass" do
+      MatrixSub.ins.round.should be_an_instance_of(MatrixSub)
+    end
+  end
+end