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diff --git a/spec/ruby/library/matrix/constructor_spec.rb b/spec/ruby/library/matrix/constructor_spec.rb
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+++ b/spec/ruby/library/matrix/constructor_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require 'matrix'
+
+describe "Matrix.[]" do
+
+  it "requires arrays as parameters" do
+    lambda { Matrix[5] }.should raise_error(TypeError)
+    lambda { Matrix[nil] }.should raise_error(TypeError)
+    lambda { Matrix[1..2] }.should raise_error(TypeError)
+    lambda { Matrix[[1, 2], 3] }.should raise_error(TypeError)
+  end
+
+  it "creates an empty Matrix with no arguments" do
+    m = Matrix[]
+    m.column_size.should == 0
+    m.row_size.should == 0
+  end
+
+  it "raises for non-rectangular matrices" do
+    lambda{ Matrix[ [0], [0,1] ] }.should \
+      raise_error(Matrix::ErrDimensionMismatch)
+    lambda{ Matrix[ [0,1], [0,1,2], [0,1] ]}.should \
+      raise_error(Matrix::ErrDimensionMismatch)
+  end
+
+  it "accepts vector arguments" do
+    a = Matrix[Vector[1, 2], Vector[3, 4]]
+    a.should be_an_instance_of(Matrix)
+    a.should == Matrix[ [1, 2], [3, 4] ]
+  end
+
+  it "tries to calls :to_ary on arguments" do
+    array = mock('ary')
+    array.should_receive(:to_ary).and_return([1,2])
+    Matrix[array, [3,4] ].should == Matrix[ [1,2], [3,4] ]
+  end
+
+
+  it "returns a Matrix object" do
+    Matrix[ [1] ].should be_an_instance_of(Matrix)
+  end
+
+  it "can create an nxn Matrix" do
+    m = Matrix[ [20,30], [40.5, 9] ]
+    m.row_size.should == 2
+    m.column_size.should == 2
+    m.column(0).should == Vector[20, 40.5]
+    m.column(1).should == Vector[30, 9]
+    m.row(0).should == Vector[20, 30]
+    m.row(1).should == Vector[40.5, 9]
+  end
+
+  it "can create a 0xn Matrix" do
+    m = Matrix[ [], [], [] ]
+    m.row_size.should == 3
+    m.column_size.should == 0
+  end
+
+  describe "for a subclass of Matrix" do
+    it "returns an instance of that subclass" do
+      MatrixSub[ [20,30], [40.5, 9] ].should be_an_instance_of(MatrixSub)
+    end
+  end
+end