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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/accessor'
describe "Struct#hash" do
it "returns the same integer for structs with the same content" do
[StructClasses::Ruby.new("1.8.6", "PPC"),
StructClasses::Car.new("Hugo", "Foo", "1972")].each do |stc|
stc.hash.should == stc.dup.hash
stc.hash.should be_kind_of(Integer)
end
end
it "returns the same value if structs are #eql?" do
car = StructClasses::Car.new("Honda", "Accord", "1998")
similar_car = StructClasses::Car.new("Honda", "Accord", "1998")
car.should eql(similar_car)
car.hash.should == similar_car.hash
end
it "returns different hashes for structs with different values" do
s1 = StructClasses::Ruby.new('2.7.0', 'linux')
s2 = StructClasses::Ruby.new('2.7.0', 'macos')
s1.hash.should_not == s2.hash
end
it "returns different hashes for structs with different values when using keyword_init: true" do
key = :"1 non symbol member"
struct_class = Struct.new(key, keyword_init: true)
t1 = struct_class.new(key => 1)
t2 = struct_class.new(key => 2)
t1.hash.should_not == t2.hash
end
it "allows for overriding methods in an included module" do
mod = Module.new do
def hash
"different"
end
end
s = Struct.new(:arg) do
include mod
end
s.new.hash.should == "different"
end
it "returns the same hash for recursive structs" do
car = StructClasses::Car.new("Honda", "Accord", "1998")
similar_car = StructClasses::Car.new("Honda", "Accord", "1998")
car[:make] = car
similar_car[:make] = car
car.hash.should == similar_car.hash
# This is because car.eql?(similar_car).
# Objects that are eql? must return the same hash.
# See the Struct#eql? specs
end
it "returns different hashes for different struct classes" do
Struct.new(:x).new(1).hash.should != Struct.new(:y).new(1).hash
end
it_behaves_like :struct_accessor, :hash
end
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