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require "spec_helper"
require "hamster/set"
describe Hamster::Set do
let(:set) { S["A", "B", "C"] }
describe "#delete" do
context "with an existing value" do
it "preserves the original" do
set.delete("B")
set.should eql(S["A", "B", "C"])
end
it "returns a copy with the remaining values" do
set.delete("B").should eql(S["A", "C"])
end
end
context "with a non-existing value" do
it "preserves the original values" do
set.delete("D")
set.should eql(S["A", "B", "C"])
end
it "returns self" do
set.delete("D").should equal(set)
end
end
context "when removing the last value in a set" do
it "returns the canonical empty set" do
set.delete("B").delete("C").delete("A").should be(Hamster::EmptySet)
end
end
it "works on large sets, with many combinations of input" do
array = 1000.times.map { %w[a b c d e f g h i j k l m n].sample(5).join }.uniq
set = S.new(array)
array.each do |key|
result = set.delete(key)
result.size.should == set.size - 1
result.include?(key).should == false
other = array.sample
(result.include?(other).should == true) if other != key
end
end
end
describe "#delete?" do
context "with an existing value" do
it "preserves the original" do
set.delete?("B")
set.should eql(S["A", "B", "C"])
end
it "returns a copy with the remaining values" do
set.delete?("B").should eql(S["A", "C"])
end
end
context "with a non-existing value" do
it "preserves the original values" do
set.delete?("D")
set.should eql(S["A", "B", "C"])
end
it "returns false" do
set.delete?("D").should be(false)
end
end
end
end
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