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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
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 subtracting the corresponding elements of other from self" do
(@a - @b).should == Matrix[ [-3,-3], [-3,-3] ]
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
lambda { @a - Matrix[ [1] ] }.should raise_error(Matrix::ErrDimensionMismatch)
end
it "raises a ExceptionForMatrix::ErrOperationNotDefined if other is a Numeric Type" do
lambda { @a - 2 }.should raise_error(Matrix::ErrOperationNotDefined)
lambda { @a - 1.2 }.should raise_error(Matrix::ErrOperationNotDefined)
lambda { @a - bignum_value }.should raise_error(Matrix::ErrOperationNotDefined)
end
it "raises a TypeError if other is of wrong type" do
lambda { @a - nil }.should raise_error(TypeError)
lambda { @a - "a" }.should raise_error(TypeError)
lambda { @a - [ [1, 2] ] }.should raise_error(TypeError)
lambda { @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
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