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32 lines
929 B
Ruby
32 lines
929 B
Ruby
require_relative '../../spec_helper'
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require 'matrix'
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describe "Matrix#permutation?" do
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it "returns true for a permutation Matrix" do
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Matrix[[0, 1, 0], [0, 0, 1], [1, 0, 0]].permutation?.should be_true
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end
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it "returns false for a non permutation square Matrix" do
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Matrix[[0, 1], [0, 0]].permutation?.should be_false
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Matrix[[-1, 0], [0, -1]].permutation?.should be_false
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Matrix[[1, 0], [1, 0]].permutation?.should be_false
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Matrix[[1, 0], [1, 1]].permutation?.should be_false
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end
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it "returns true for an empty 0x0 matrix" do
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Matrix.empty(0,0).permutation?.should be_true
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end
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it "raises an error for rectangular matrices" do
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[
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Matrix[[0], [0]],
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Matrix[[0, 0]],
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Matrix.empty(0, 2),
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Matrix.empty(2, 0),
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].each do |rectangular_matrix|
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-> {
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rectangular_matrix.permutation?
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}.should raise_error(Matrix::ErrDimensionMismatch)
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end
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end
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end
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