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