1 files changed, 18 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/eigenvalue_decomposition/to_a_spec.rb b/spec/ruby/library/matrix/eigenvalue_decomposition/to_a_spec.rb
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index 0000000000..e9b849eb97
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+++ b/spec/ruby/library/matrix/eigenvalue_decomposition/to_a_spec.rb
@@ -0,0 +1,18 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix::EigenvalueDecomposition#to_a" do
+  before :each do
+    @a = Matrix[[14, 16], [-6, -6]]
+    @e = Matrix::EigenvalueDecomposition.new(@a)
+  end
+
+  it "returns an array of with [V, D, V.inv]" do
+    @e.to_a.should == [@e.v, @e.d, @e.v_inv]
+  end
+
+  it "returns a factorization" do
+    v, d, v_inv = @e.to_a
+    (v * d * v_inv).map{|e| e.round(10)}.should == @a
+  end
+end