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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Hash.new" do
it "creates an empty Hash if passed no arguments" do
Hash.new.should == {}
Hash.new.size.should == 0
end
it "creates a new Hash with default object if passed a default argument" do
Hash.new(5).default.should == 5
Hash.new({}).default.should == {}
end
it "does not create a copy of the default argument" do
str = "foo"
Hash.new(str).default.should equal(str)
end
it "creates a Hash with a default_proc if passed a block" do
Hash.new.default_proc.should == nil
h = Hash.new { |x| "Answer to #{x}" }
h.default_proc.call(5).should == "Answer to 5"
h.default_proc.call("x").should == "Answer to x"
end
it "raises an ArgumentError if more than one argument is passed" do
-> { Hash.new(5,6) }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if passed both default argument and default block" do
-> { Hash.new(5) { 0 } }.should raise_error(ArgumentError)
-> { Hash.new(nil) { 0 } }.should raise_error(ArgumentError)
end
ruby_version_is "3.3"..."3.4" do
it "emits a deprecation warning if keyword arguments are passed" do
-> { Hash.new(unknown: true) }.should complain(
Regexp.new(Regexp.escape("Calling Hash.new with keyword arguments is deprecated and will be removed in Ruby 3.4; use Hash.new({ key: value }) instead"))
)
-> { Hash.new(1, unknown: true) }.should raise_error(ArgumentError)
-> { Hash.new(unknown: true) { 0 } }.should raise_error(ArgumentError)
Hash.new({ unknown: true }).default.should == { unknown: true }
end
end
ruby_version_is "3.4" do
it "accepts a capacity: argument" do
Hash.new(5, capacity: 42).default.should == 5
Hash.new(capacity: 42).default.should == nil
(Hash.new(capacity: 42) { 1 }).default_proc.should_not == nil
end
it "ignores negative capacity" do
-> { Hash.new(capacity: -42) }.should_not raise_error
end
it "raises an error if unknown keyword arguments are passed" do
-> { Hash.new(unknown: true) }.should raise_error(ArgumentError)
-> { Hash.new(1, unknown: true) }.should raise_error(ArgumentError)
-> { Hash.new(unknown: true) { 0 } }.should raise_error(ArgumentError)
end
end
end
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