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