ruby--ruby/spec/ruby/library/matrix/symmetric_spec.rb

require_relative '../../spec_helper'
require 'matrix'

describe "Matrix.symmetric?" do
  it "returns true for a symmetric Matrix" do
    Matrix[[1, 2, Complex(0, 3)], [2, 4, 5], [Complex(0, 3), 5, 6]].symmetric?.should be_true
  end

  it "returns true for a 0x0 empty matrix" do
    Matrix.empty.symmetric?.should be_true
  end

  it "returns false for an asymmetric Matrix" do
    Matrix[[1, 2],[-2, 1]].symmetric?.should be_false
  end

  it "raises an error for rectangular matrices" do
    [
      Matrix[[0], [0]],
      Matrix[[0, 0]],
      Matrix.empty(0, 2),
      Matrix.empty(2, 0),
    ].each do |rectangular_matrix|
      lambda {
        rectangular_matrix.symmetric?
      }.should raise_error(Matrix::ErrDimensionMismatch)
    end
  end
end