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require File.expand_path('../../../spec_helper', __FILE__)
describe "Hash#rassoc" do
before :each do
@h = {apple: :green, orange: :orange, grape: :green, banana: :yellow}
end
it "returns an Array if the argument is a value of the Hash" do
@h.rassoc(:green).should be_an_instance_of(Array)
end
it "returns a 2-element Array if the argument is a value of the Hash" do
@h.rassoc(:orange).size.should == 2
end
it "sets the first element of the Array to the key of the located value" do
@h.rassoc(:yellow).first.should == :banana
end
it "sets the last element of the Array to the located value" do
@h.rassoc(:yellow).last.should == :yellow
end
it "only returns the first matching key-value pair" do
@h.rassoc(:green).should == [:apple, :green]
end
it "uses #== to compare the argument to the values" do
@h[:key] = 1.0
1.should == 1.0
@h.rassoc(1).should eql [:key, 1.0]
end
it "returns nil if the argument is not a value of the Hash" do
@h.rassoc(:banana).should be_nil
end
it "returns nil if the argument is not a value of the Hash even when there is a default" do
Hash.new(42).merge!( foo: :bar ).rassoc(42).should be_nil
Hash.new{|h, k| h[k] = 42}.merge!( foo: :bar ).rassoc(42).should be_nil
end
end
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