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keyword_arguments_spec.rb
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require_relative '../spec_helper'
describe "Keyword arguments" do
def target(*args, **kwargs)
[args, kwargs]
end
it "are separated from positional arguments" do
def m(*args, **kwargs)
[args, kwargs]
end
empty = {}
m(**empty).should == [[], {}]
m(empty).should == [[{}], {}]
m(a: 1).should == [[], {a: 1}]
m({a: 1}).should == [[{a: 1}], {}]
end
it "when the receiving method has not keyword parameters it treats kwargs as positional" do
def m(*a)
a
end
m(a: 1).should == [{a: 1}]
m({a: 1}).should == [{a: 1}]
end
context "empty kwargs are treated as if they were not passed" do
it "when calling a method" do
def m(*a)
a
end
empty = {}
m(**empty).should == []
m(empty).should == [{}]
end
it "when yielding to a block" do
def y(*args, **kwargs)
yield(*args, **kwargs)
end
empty = {}
y(**empty) { |*a| a }.should == []
y(empty) { |*a| a }.should == [{}]
end
end
it "extra keywords are not allowed without **kwrest" do
def m(*a, kw:)
a
end
m(kw: 1).should == []
-> { m(kw: 1, kw2: 2) }.should raise_error(ArgumentError, 'unknown keyword: :kw2')
-> { m(kw: 1, true => false) }.should raise_error(ArgumentError, 'unknown keyword: true')
-> { m(kw: 1, a: 1, b: 2, c: 3) }.should raise_error(ArgumentError, 'unknown keywords: :a, :b, :c')
end
it "raises ArgumentError exception when required keyword argument is not passed" do
def m(a:, b:, c:)
[a, b, c]
end
-> { m(a: 1, b: 2) }.should raise_error(ArgumentError, /missing keyword: :c/)
-> { m() }.should raise_error(ArgumentError, /missing keywords: :a, :b, :c/)
end
it "raises ArgumentError for missing keyword arguments even if there are extra ones" do
def m(a:)
a
end
-> { m(b: 1) }.should raise_error(ArgumentError, /missing keyword: :a/)
end
it "handle * and ** at the same call site" do
def m(*a)
a
end
m(*[], **{}).should == []
m(*[], 42, **{}).should == [42]
end
context "**" do
ruby_version_is "3.3" do
it "copies a non-empty Hash for a method taking (*args)" do
def m(*args)
args[0]
end
h = {a: 1}
m(**h).should_not.equal?(h)
h.should == {a: 1}
end
end
it "copies the given Hash for a method taking (**kwargs)" do
def m(**kw)
kw
end
empty = {}
m(**empty).should == empty
m(**empty).should_not.equal?(empty)
h = {a: 1}
m(**h).should == h
m(**h).should_not.equal?(h)
end
end
context "delegation" do
it "works with (*args, **kwargs)" do
def m(*args, **kwargs)
target(*args, **kwargs)
end
empty = {}
m(**empty).should == [[], {}]
m(empty).should == [[{}], {}]
m(a: 1).should == [[], {a: 1}]
m({a: 1}).should == [[{a: 1}], {}]
end
it "works with proc { |*args, **kwargs| }" do
m = proc do |*args, **kwargs|
target(*args, **kwargs)
end
empty = {}
m.(**empty).should == [[], {}]
m.(empty).should == [[{}], {}]
m.(a: 1).should == [[], {a: 1}]
m.({a: 1}).should == [[{a: 1}], {}]
# no autosplatting for |*args, **kwargs|
m.([1, 2]).should == [[[1, 2]], {}]
end
it "works with -> (*args, **kwargs) {}" do
m = -> *args, **kwargs do
target(*args, **kwargs)
end
empty = {}
m.(**empty).should == [[], {}]
m.(empty).should == [[{}], {}]
m.(a: 1).should == [[], {a: 1}]
m.({a: 1}).should == [[{a: 1}], {}]
end
it "works with (...)" do
instance_eval <<~DEF
def m(...)
target(...)
end
DEF
empty = {}
m(**empty).should == [[], {}]
m(empty).should == [[{}], {}]
m(a: 1).should == [[], {a: 1}]
m({a: 1}).should == [[{a: 1}], {}]
end
it "works with call(*ruby2_keyword_args)" do
class << self
ruby2_keywords def m(*args)
target(*args)
end
end
empty = {}
m(**empty).should == [[], {}]
Hash.ruby2_keywords_hash?(empty).should == false
m(empty).should == [[{}], {}]
Hash.ruby2_keywords_hash?(empty).should == false
m(a: 1).should == [[], {a: 1}]
m({a: 1}).should == [[{a: 1}], {}]
kw = {a: 1}
m(**kw).should == [[], {a: 1}]
m(**kw)[1].should == kw
m(**kw)[1].should_not.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
Hash.ruby2_keywords_hash?(m(**kw)[1]).should == false
m(kw).should == [[{a: 1}], {}]
m(kw)[0][0].should.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
end
it "works with super(*ruby2_keyword_args)" do
parent = Class.new do
def m(*args, **kwargs)
[args, kwargs]
end
end
child = Class.new(parent) do
ruby2_keywords def m(*args)
super(*args)
end
end
obj = child.new
empty = {}
obj.m(**empty).should == [[], {}]
Hash.ruby2_keywords_hash?(empty).should == false
obj.m(empty).should == [[{}], {}]
Hash.ruby2_keywords_hash?(empty).should == false
obj.m(a: 1).should == [[], {a: 1}]
obj.m({a: 1}).should == [[{a: 1}], {}]
kw = {a: 1}
obj.m(**kw).should == [[], {a: 1}]
obj.m(**kw)[1].should == kw
obj.m(**kw)[1].should_not.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
Hash.ruby2_keywords_hash?(obj.m(**kw)[1]).should == false
obj.m(kw).should == [[{a: 1}], {}]
obj.m(kw)[0][0].should.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
end
it "works with zsuper" do
parent = Class.new do
def m(*args, **kwargs)
[args, kwargs]
end
end
child = Class.new(parent) do
ruby2_keywords def m(*args)
super
end
end
obj = child.new
empty = {}
obj.m(**empty).should == [[], {}]
Hash.ruby2_keywords_hash?(empty).should == false
obj.m(empty).should == [[{}], {}]
Hash.ruby2_keywords_hash?(empty).should == false
obj.m(a: 1).should == [[], {a: 1}]
obj.m({a: 1}).should == [[{a: 1}], {}]
kw = {a: 1}
obj.m(**kw).should == [[], {a: 1}]
obj.m(**kw)[1].should == kw
obj.m(**kw)[1].should_not.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
Hash.ruby2_keywords_hash?(obj.m(**kw)[1]).should == false
obj.m(kw).should == [[{a: 1}], {}]
obj.m(kw)[0][0].should.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
end
it "works with yield(*ruby2_keyword_args)" do
class << self
def y(args)
yield(*args)
end
ruby2_keywords def m(*outer_args)
y(outer_args, &-> *args, **kwargs { target(*args, **kwargs) })
end
end
empty = {}
m(**empty).should == [[], {}]
Hash.ruby2_keywords_hash?(empty).should == false
m(empty).should == [[{}], {}]
Hash.ruby2_keywords_hash?(empty).should == false
m(a: 1).should == [[], {a: 1}]
m({a: 1}).should == [[{a: 1}], {}]
kw = {a: 1}
m(**kw).should == [[], {a: 1}]
m(**kw)[1].should == kw
m(**kw)[1].should_not.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
Hash.ruby2_keywords_hash?(m(**kw)[1]).should == false
m(kw).should == [[{a: 1}], {}]
m(kw)[0][0].should.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
end
it "does not work with (*args)" do
class << self
def m(*args)
target(*args)
end
end
empty = {}
m(**empty).should == [[], {}]
m(empty).should == [[{}], {}]
m(a: 1).should == [[{a: 1}], {}]
m({a: 1}).should == [[{a: 1}], {}]
end
ruby_version_is "3.1" do
describe "omitted values" do
it "accepts short notation 'key' for 'key: value' syntax" do
def m(a:, b:)
[a, b]
end
a = 1
b = 2
eval('m(a:, b:).should == [1, 2]')
end
end
end
ruby_version_is "3.2" do
it "does not work with call(*ruby2_keyword_args) with missing ruby2_keywords in between" do
class << self
def n(*args) # Note the missing ruby2_keywords here
target(*args)
end
ruby2_keywords def m(*args)
n(*args)
end
end
empty = {}
m(**empty).should == [[], {}]
m(empty).should == [[{}], {}]
m(a: 1).should == [[{a: 1}], {}]
m({a: 1}).should == [[{a: 1}], {}]
end
end
ruby_version_is ""..."3.2" do
# https://bugs.ruby-lang.org/issues/18625
it "works with call(*ruby2_keyword_args) with missing ruby2_keywords in between due to CRuby bug #18625" do
class << self
def n(*args) # Note the missing ruby2_keywords here
target(*args)
end
ruby2_keywords def m(*args)
n(*args)
end
end
empty = {}
m(**empty).should == [[], {}]
Hash.ruby2_keywords_hash?(empty).should == false
m(empty).should == [[{}], {}]
Hash.ruby2_keywords_hash?(empty).should == false
m(a: 1).should == [[], {a: 1}]
m({a: 1}).should == [[{a: 1}], {}]
kw = {a: 1}
m(**kw).should == [[], {a: 1}]
m(**kw)[1].should == kw
m(**kw)[1].should_not.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
Hash.ruby2_keywords_hash?(m(**kw)[1]).should == false
m(kw).should == [[{a: 1}], {}]
m(kw)[0][0].should.equal?(kw)
Hash.ruby2_keywords_hash?(kw).should == false
end
end
end
end