spec/ruby/library/matrix/rows_spec.rb


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require_relative '../../spec_helper'

ruby_version_is ""..."3.1" do
  require_relative 'fixtures/classes'
  require 'matrix'

  describe "Matrix.rows" do
    before :each do
      @a = [1, 2]
      @b = [3, 4]
      @m = Matrix.rows([@a, @b])
    end

    it "returns a Matrix" do
      @m.should be_kind_of(Matrix)
    end

    it "creates a matrix from argument rows" do
      @m.row(0).to_a.should == @a
      @m.row(1).to_a.should == @b
    end

    it "copies the original rows by default" do
      @a << 3
      @b << 6
      @m.row(0).should_not equal(@a)
      @m.row(1).should_not equal(@b)
    end

    it "references the original rows if copy is false" do
      @m_ref = Matrix.rows([@a, @b], false)
      @a << 3
      @b << 6
      @m_ref.row(0).to_a.should == @a
      @m_ref.row(1).to_a.should == @b
    end

    describe "for a subclass of Matrix" do
      it "returns an instance of that subclass" do
        MatrixSub.rows([[0, 1], [0, 1]]).should be_an_instance_of(MatrixSub)
      end
    end
  end
end