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require "spec_helper"
require "hamster/vector"
describe Hamster::Vector do
describe "#fetch" do
let(:vector) { V['a', 'b', 'c'] }
context "with no default provided" do
context "when the index exists" do
it "returns the value at the index" do
vector.fetch(0).should == "a"
vector.fetch(1).should == "b"
vector.fetch(2).should == "c"
end
end
context "when the key does not exist" do
it "raises an IndexError" do
-> { vector.fetch(3) }.should raise_error(IndexError)
-> { vector.fetch(-4) }.should raise_error(IndexError)
end
end
end
context "with a default value" do
context "when the index exists" do
it "returns the value at the index" do
vector.fetch(0, "default").should == "a"
vector.fetch(1, "default").should == "b"
vector.fetch(2, "default").should == "c"
end
end
context "when the index does not exist" do
it "returns the default value" do
vector.fetch(3, "default").should == "default"
vector.fetch(-4, "default").should == "default"
end
end
end
context "with a default block" do
context "when the index exists" do
it "returns the value at the index" do
vector.fetch(0) { "default".upcase }.should == "a"
vector.fetch(1) { "default".upcase }.should == "b"
vector.fetch(2) { "default".upcase }.should == "c"
end
end
context "when the index does not exist" do
it "invokes the block with the missing index as parameter" do
vector.fetch(3) { |index| index.should == 3}
vector.fetch(-4) { |index| index.should == -4 }
vector.fetch(3) { "default".upcase }.should == "DEFAULT"
vector.fetch(-4) { "default".upcase }.should == "DEFAULT"
end
end
end
it "gives precedence to default block over default argument if passed both" do
vector.fetch(3, 'one') { 'two' }.should == 'two'
end
end
end
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