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require_relative '../../spec_helper'
describe "Struct#dig" do
before(:each) do
@klass = Struct.new(:a)
@instance = @klass.new(@klass.new({ b: [1, 2, 3] }))
end
it "returns the nested value specified by the sequence of keys" do
@instance.dig(:a, :a).should == { b: [1, 2, 3] }
end
it "returns the nested value specified if the sequence includes an index" do
@instance.dig(:a, :a, :b, 0).should == 1
end
it "returns nil if any intermediate step is nil" do
@instance.dig(:b, 0).should == nil
end
it "raises a TypeError if any intermediate step does not respond to #dig" do
instance = @klass.new(1)
-> {
instance.dig(:a, 3)
}.should raise_error(TypeError)
end
it "raises an ArgumentError if no arguments provided" do
-> { @instance.dig }.should raise_error(ArgumentError)
end
it "calls #dig on any intermediate step with the rest of the sequence as arguments" do
obj = Object.new
instance = @klass.new(obj)
def obj.dig(*args)
{dug: args}
end
instance.dig(:a, :bar, :baz).should == { dug: [:bar, :baz] }
end
end
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