1 files changed, 26 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/orthogonal_spec.rb b/spec/ruby/library/matrix/orthogonal_spec.rb
new file mode 100644
index 0000000000..2e76b5924c
--- /dev/null
+++ b/spec/ruby/library/matrix/orthogonal_spec.rb
@@ -0,0 +1,26 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix.orthogonal?" do
+  it "returns false for non orthogonal matrices" do
+    Matrix[[0, 1], [1, 2]].orthogonal?.should == false
+    Matrix[[1, 1, 0], [0, 1, 1], [1, 0, 1]].orthogonal?.should == false
+  end
+
+  it "returns true for orthogonal matrices" do
+    Matrix[[0, 1], [1, 0]].orthogonal?.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.orthogonal?
+      }.should raise_error(Matrix::ErrDimensionMismatch)
+    end
+  end
+end