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require_relative '../../spec_helper'
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
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