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require File.dirname(__FILE__) + '/../../spec_helper'
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
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(ExceptionForMatrix::ErrOperationNotDefined)
lambda { @a + 1.2 }.should raise_error(ExceptionForMatrix::ErrOperationNotDefined)
lambda { @a + bignum_value }.should raise_error(ExceptionForMatrix::ErrOperationNotDefined)
end
it "raises an exception if other is not a Matrix" do
# Note that MRI raises NoMethodError because #coerce is called
# on objects that don't provide it. This appears to be more of
# an "oops" rather than an aspect of the interface. We don't
# spec the exception class.
lambda { @a + nil }.should raise_error
lambda { @a + "a" }.should raise_error
lambda { @a + [ [1, 2] ] }.should raise_error
lambda { @a + Object.new }.should raise_error
end
end
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