1 files changed, 34 insertions, 2 deletions
diff --git a/spec/ruby/library/matrix/determinant_spec.rb b/spec/ruby/library/matrix/determinant_spec.rb
index 825c9907b1..603e13ba28 100644
--- a/spec/ruby/library/matrix/determinant_spec.rb
+++ b/spec/ruby/library/matrix/determinant_spec.rb
@@ -1,7 +1,39 @@
 require_relative '../../spec_helper'
-require_relative 'shared/determinant'
 require 'matrix'
 
 describe "Matrix#determinant" do
-  it_behaves_like :determinant, :determinant
+  it "returns the determinant of a square Matrix" do
+    m = Matrix[ [7,6], [3,9] ]
+    m.determinant.should == 45
+
+    m = Matrix[ [9, 8], [6,5] ]
+    m.determinant.should == -3
+
+    m = Matrix[ [9,8,3], [4,20,5], [1,1,1] ]
+    m.determinant.should == 95
+  end
+
+  it "returns the determinant of a single-element Matrix" do
+    m = Matrix[ [2] ]
+    m.determinant.should == 2
+  end
+
+  it "returns 1 for an empty Matrix" do
+    m = Matrix[ ]
+    m.determinant.should == 1
+  end
+
+  it "returns the determinant even for Matrices containing 0 as first entry" do
+    Matrix[[0,1],[1,0]].determinant.should == -1
+  end
+
+  it "raises an error for rectangular matrices" do
+    -> {
+      Matrix[[1], [2], [3]].determinant
+    }.should.raise(Matrix::ErrDimensionMismatch)
+
+    -> {
+      Matrix.empty(3,0).determinant
+    }.should.raise(Matrix::ErrDimensionMismatch)
+  end
 end