1 files changed, 18 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/lup_decomposition/u_spec.rb b/spec/ruby/library/matrix/lup_decomposition/u_spec.rb
new file mode 100644
index 0000000000..97e8580c58
--- /dev/null
+++ b/spec/ruby/library/matrix/lup_decomposition/u_spec.rb
@@ -0,0 +1,18 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix::LUPDecomposition#u" do
+  before :each do
+    @a = Matrix[[7, 8, 9], [14, 46, 51], [28, 82, 163]]
+    @lu = Matrix::LUPDecomposition.new(@a)
+    @u = @lu.u
+  end
+
+  it "returns the second element of to_a" do
+    @u.should == @lu.to_a[1]
+  end
+
+  it "returns an upper triangular matrix" do
+    @u.upper_triangular?.should be_true
+  end
+end