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require_relative '../fixtures/classes'
require 'matrix'
describe :inverse, shared: true do
it "returns a Matrix" do
Matrix[ [1,2], [2,1] ].send(@method).should be_an_instance_of(Matrix)
end
it "returns the inverse of the Matrix" do
Matrix[
[1, 3, 3], [1, 4, 3], [1, 3, 4]
].send(@method).should ==
Matrix[
[7, -3, -3], [-1, 1, 0], [-1, 0, 1]
]
end
it "returns the inverse of the Matrix (other case)" do
Matrix[
[1, 2, 3], [0, 1, 4], [5, 6, 0]
].send(@method).should be_close_to_matrix([
[-24, 18, 5], [20, -15, -4], [-5, 4, 1]
])
end
it "raises a ErrDimensionMismatch if the Matrix is not square" do
->{
Matrix[ [1,2,3], [1,2,3] ].send(@method)
}.should raise_error(Matrix::ErrDimensionMismatch)
end
describe "for a subclass of Matrix" do
it "returns an instance of that subclass" do
MatrixSub.ins.send(@method).should be_an_instance_of(MatrixSub)
end
end
end
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