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require_relative '../../spec_helper'
require 'matrix'
describe "Matrix#each_with_index" do
before :all do
@m = Matrix[ [1, 2, 3], [4, 5, 6] ]
@result = [
[1, 0, 0],
[2, 0, 1],
[3, 0, 2],
[4, 1, 0],
[5, 1, 1],
[6, 1, 2]
]
end
it "returns an Enumerator when called without a block" do
enum = @m.each_with_index
enum.should be_an_instance_of(Enumerator)
enum.to_a.should == @result
end
it "returns self" do
@m.each_with_index{}.should equal(@m)
end
it "yields the elements starting with the those of the first row" do
a = []
@m.each_with_index {|x, r, c| a << [x, r, c]}
a.should == @result
end
end
describe "Matrix#each_with_index with an argument" do
before :all do
@m = Matrix[ [1, 2, 3, 4], [5, 6, 7, 8] ]
@t = Matrix[ [1, 2], [3, 4], [5, 6], [7, 8] ]
end
it "raises an ArgumentError for unrecognized argument" do
-> {
@m.each_with_index("all"){}
}.should raise_error(ArgumentError)
-> {
@m.each_with_index(nil){}
}.should raise_error(ArgumentError)
-> {
@m.each_with_index(:left){}
}.should raise_error(ArgumentError)
end
it "yields the rights elements when passed :diagonal" do
@m.each_with_index(:diagonal).to_a.should == [[1, 0, 0], [6, 1, 1]]
@t.each_with_index(:diagonal).to_a.should == [[1, 0, 0], [4, 1, 1]]
end
it "yields the rights elements when passed :off_diagonal" do
@m.each_with_index(:off_diagonal).to_a.should == [[2, 0, 1], [3, 0, 2], [4, 0, 3], [5, 1, 0], [7, 1, 2], [8, 1, 3]]
@t.each_with_index(:off_diagonal).to_a.should == [[2, 0, 1], [3, 1, 0], [5, 2, 0], [6, 2, 1], [7, 3, 0], [8, 3, 1]]
end
it "yields the rights elements when passed :lower" do
@m.each_with_index(:lower).to_a.should == [[1, 0, 0], [5, 1, 0], [6, 1, 1]]
@t.each_with_index(:lower).to_a.should == [[1, 0, 0], [3, 1, 0], [4, 1, 1], [5, 2, 0], [6, 2, 1], [7, 3, 0], [8, 3, 1]]
end
it "yields the rights elements when passed :strict_lower" do
@m.each_with_index(:strict_lower).to_a.should == [[5, 1, 0]]
@t.each_with_index(:strict_lower).to_a.should == [[3, 1, 0], [5, 2, 0], [6, 2, 1], [7, 3, 0], [8, 3, 1]]
end
it "yields the rights elements when passed :strict_upper" do
@m.each_with_index(:strict_upper).to_a.should == [[2, 0, 1], [3, 0, 2], [4, 0, 3], [7, 1, 2], [8, 1, 3]]
@t.each_with_index(:strict_upper).to_a.should == [[2, 0, 1]]
end
it "yields the rights elements when passed :upper" do
@m.each_with_index(:upper).to_a.should == [[1, 0, 0], [2, 0, 1], [3, 0, 2], [4, 0, 3], [6, 1, 1], [7, 1, 2], [8, 1, 3]]
@t.each_with_index(:upper).to_a.should == [[1, 0, 0], [2, 0, 1], [4, 1, 1]]
end
end
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