require_relative '../../spec_helper' require_relative 'fixtures/classes' require 'matrix' describe "Matrix#+" do before :each do @a = Matrix[ [1,2], [3,4] ] @b = Matrix[ [4,5], [6,7] ] end it "returns the result of adding the corresponding elements of self and other" do (@a + @b).should == Matrix[ [5,7], [9,11] ] end it "returns an instance of Matrix" do (@a + @b).should be_kind_of(Matrix) end it "raises a Matrix::ErrDimensionMismatch if the matrices are different sizes" do -> { @a + Matrix[ [1] ] }.should raise_error(Matrix::ErrDimensionMismatch) end it "raises a ExceptionForMatrix::ErrOperationNotDefined if other is a Numeric Type" do -> { @a + 2 }.should raise_error(ExceptionForMatrix::ErrOperationNotDefined) -> { @a + 1.2 }.should raise_error(ExceptionForMatrix::ErrOperationNotDefined) -> { @a + bignum_value }.should raise_error(ExceptionForMatrix::ErrOperationNotDefined) end it "raises a TypeError if other is of wrong type" do -> { @a + nil }.should raise_error(TypeError) -> { @a + "a" }.should raise_error(TypeError) -> { @a + [ [1, 2] ] }.should raise_error(TypeError) -> { @a + Object.new }.should raise_error(TypeError) end describe "for a subclass of Matrix" do it "returns an instance of that subclass" do m = MatrixSub.ins (m+m).should be_an_instance_of(MatrixSub) end end end