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