1 files changed, 22 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/eigenvalue_decomposition/eigenvalues_spec.rb b/spec/ruby/library/matrix/eigenvalue_decomposition/eigenvalues_spec.rb
new file mode 100644
index 0000000000..c175a29947
--- /dev/null
+++ b/spec/ruby/library/matrix/eigenvalue_decomposition/eigenvalues_spec.rb
@@ -0,0 +1,22 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix::EigenvalueDecomposition#eigenvalues" do
+  it "returns an array of complex eigenvalues for a rotation matrix" do
+    Matrix[[ 1, 1],
+           [-1, 1]].eigensystem.eigenvalues.sort_by{|v| v.imag}.should ==
+    [ Complex(1, -1), Complex(1, 1)]
+  end
+
+  it "returns an array of real eigenvalues for a symetric matrix" do
+    Matrix[[1, 2],
+           [2, 1]].eigensystem.eigenvalues.sort.map!{|x| x.round(10)}.should ==
+    [ -1, 3 ]
+  end
+
+  it "returns an array of real eigenvalues for a matrix" do
+    Matrix[[14, 16],
+           [-6, -6]].eigensystem.eigenvalues.sort.map!{|x| x.round(10)}.should ==
+    [ 2, 6 ]
+  end
+end