Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/matrix/lup_decomposition/determinant_spec.rb

@@ -0,0 +1,21 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix::LUPDecomposition#determinant" do
+  it "returns the determinant when the matrix is square" do
+    a = Matrix[[7, 8, 9], [14, 46, 51], [28, 82, 163]]
+    a.lup.determinant.should == 15120 # == a.determinant
+  end
+
+  it "raises an error for rectangular matrices" do
+    [
+      Matrix[[7, 8, 9], [14, 46, 51]],
+      Matrix[[7, 8], [14, 46], [28, 82]],
+    ].each do |m|
+      lup = m.lup
+      lambda {
+        lup.determinant
+      }.should raise_error(Matrix::ErrDimensionMismatch)
+    end
+  end
+end