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require File.expand_path('../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix#row" do
before :all do
@m = Matrix[ [1, 2], [2, 3], [3, 4] ]
end
it "returns a Vector when called without a block" do
@m.row(0).should == Vector[1,2]
end
it "yields the elements of the row when called with a block" do
a = []
@m.row(0) {|x| a << x}
a.should == [1,2]
end
it "counts backwards for negative argument" do
@m.row(-1).should == Vector[3, 4]
end
it "returns self when called with a block" do
@m.row(0) { |x| x }.should equal(@m)
end
it "returns nil when out of bounds" do
@m.row(3).should == nil
@m.row(-4).should == nil
end
it "never yields when out of bounds" do
lambda { @m.row(3){ raise } }.should_not raise_error
lambda { @m.row(-4){ raise } }.should_not raise_error
end
end
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