Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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
--- /dev/null
+++ b/spec/rubyspec/library/matrix/unitary_spec.rb
@@ -0,0 +1,28 @@
+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