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require "spec_helper"
require "hamster/hash"
describe Hamster::Hash do
describe "#fetch" do
context "with no default provided" do
context "when the key exists" do
it "returns the value associated with the key" do
H["A" => "aye"].fetch("A").should == "aye"
end
end
context "when the key does not exist" do
it "raises a KeyError" do
-> { H["A" => "aye"].fetch("B") }.should raise_error(KeyError)
end
end
end
context "with a default value" do
context "when the key exists" do
it "returns the value associated with the key" do
H["A" => "aye"].fetch("A", "default").should == "aye"
end
end
context "when the key does not exist" do
it "returns the default value" do
H["A" => "aye"].fetch("B", "default").should == "default"
end
end
end
context "with a default block" do
context "when the key exists" do
it "returns the value associated with the key" do
H["A" => "aye"].fetch("A") { "default".upcase }.should == "aye"
end
end
context "when the key does not exist" do
it "invokes the default block with the missing key as paramter" do
H["A" => "aye"].fetch("B") { |key| key.should == "B" }
H["A" => "aye"].fetch("B") { "default".upcase }.should == "DEFAULT"
end
end
end
it "gives precedence to default block over default argument if passed both" do
H["A" => "aye"].fetch("B", 'one') { 'two' }.should == 'two'
end
it "raises an ArgumentError when not passed one or 2 arguments" do
-> { H.empty.fetch }.should raise_error(ArgumentError)
-> { H.empty.fetch(1, 2, 3) }.should raise_error(ArgumentError)
end
end
end
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