1 files changed, 28 insertions, 0 deletions
diff --git a/spec/rubyspec/library/matrix/unitary_spec.rb b/spec/rubyspec/library/matrix/unitary_spec.rb
new file mode 100644
index 0000000000..e322a5a3ce
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+++ b/spec/rubyspec/library/matrix/unitary_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix.unitary?" do
+  it "returns false for non unitary matrices" do
+    Matrix[[0, 1], [1, 2]].unitary?.should == false
+    Matrix[[0, Complex(0, 2)], [Complex(0, 2), 0]].unitary?.should == false
+    Matrix[[0, Complex(0, 1)], [Complex(0, -1), 0]].unitary?.should == false
+    Matrix[[1, 1, 0], [0, 1, 1], [1, 0, 1]].unitary?.should == false
+  end
+
+  it "returns true for unitary matrices" do
+    Matrix[[0, Complex(0, 1)], [Complex(0, 1), 0]].unitary?.should == true
+  end
+
+  it "raises an error for rectangular matrices" do
+    [
+      Matrix[[0], [0]],
+      Matrix[[0, 0]],
+      Matrix.empty(0, 2),
+      Matrix.empty(2, 0),
+    ].each do |rectangual_matrix|
+      lambda {
+        rectangual_matrix.unitary?
+      }.should raise_error(Matrix::ErrDimensionMismatch)
+    end
+  end
+end