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require File.expand_path('../../../spec_helper', __FILE__)
describe "Hash#flatten" do
before :each do
@h = {plato: :greek,
witgenstein: [:austrian, :british],
russell: :welsh}
end
it "returns an Array" do
{}.flatten.should be_an_instance_of(Array)
end
it "returns an empty Array for an empty Hash" do
{}.flatten.should == []
end
it "sets each even index of the Array to a key of the Hash" do
a = @h.flatten
a[0].should == :plato
a[2].should == :witgenstein
a[4].should == :russell
end
it "sets each odd index of the Array to the value corresponding to the previous element" do
a = @h.flatten
a[1].should == :greek
a[3].should == [:austrian, :british]
a[5].should == :welsh
end
it "does not recursively flatten Array values when called without arguments" do
a = @h.flatten
a[3].should == [:austrian, :british]
end
it "does not recursively flatten Hash values when called without arguments" do
@h[:russell] = {born: :wales, influenced_by: :mill }
a = @h.flatten
a[5].should_not == {born: :wales, influenced_by: :mill }.flatten
end
it "recursively flattens Array values when called with an argument >= 2" do
a = @h.flatten(2)
a[3].should == :austrian
a[4].should == :british
end
it "recursively flattens Array values to the given depth" do
@h[:russell] = [[:born, :wales], [:influenced_by, :mill]]
a = @h.flatten(2)
a[6].should == [:born, :wales]
a[7].should == [:influenced_by, :mill]
end
it "raises a TypeError if given a non-Integer argument" do
lambda do
@h.flatten(Object.new)
end.should raise_error(TypeError)
end
end
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