1 files changed, 31 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/singular_spec.rb b/spec/ruby/library/matrix/singular_spec.rb
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+++ b/spec/ruby/library/matrix/singular_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix#singular?" do
+  it "returns true for singular matrices" do
+    m = Matrix[ [1,2,3], [3,4,3], [0,0,0] ]
+    m.singular?.should be_true
+
+    m = Matrix[ [1,2,9], [3,4,9], [1,2,9] ]
+    m.singular?.should be_true
+  end
+
+  it "returns false if the Matrix is regular" do
+    Matrix[ [0,1], [1,0] ].singular?.should be_false
+  end
+
+  it "returns false for an empty 0x0 matrix" do
+    Matrix.empty(0,0).singular?.should be_false
+  end
+
+  it "raises an error for rectangular matrices" do
+    lambda {
+      Matrix[[1], [2], [3]].singular?
+    }.should raise_error(Matrix::ErrDimensionMismatch)
+
+    lambda {
+      Matrix.empty(3,0).singular?
+    }.should raise_error(Matrix::ErrDimensionMismatch)
+  end
+
+end