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require_relative '../spec_helper'
require_relative 'fixtures/hash_strings_binary'
require_relative 'fixtures/hash_strings_utf8'
require_relative 'fixtures/hash_strings_usascii'
describe "Hash literal" do
it "{} should return an empty hash" do
{}.size.should == 0
{}.should == {}
end
it "{} should return a new hash populated with the given elements" do
h = {a: 'a', 'b' => 3, 44 => 2.3}
h.size.should == 3
h.should == {a: "a", "b" => 3, 44 => 2.3}
end
it "treats empty expressions as nils" do
h = {() => ()}
h.keys.should == [nil]
h.values.should == [nil]
h[nil].should == nil
h = {() => :value}
h.keys.should == [nil]
h.values.should == [:value]
h[nil].should == :value
h = {key: ()}
h.keys.should == [:key]
h.values.should == [nil]
h[:key].should == nil
end
it "freezes string keys on initialization" do
key = "foo"
h = {key => "bar"}
key.reverse!
h["foo"].should == "bar"
h.keys.first.should == "foo"
h.keys.first.should.frozen?
key.should == "oof"
end
it "checks duplicated keys on initialization" do
-> {
@h = eval "{foo: :bar, foo: :foo}"
}.should complain(/key :foo is duplicated|duplicated key/)
@h.keys.size.should == 1
@h.should == {foo: :foo}
end
it "accepts a hanging comma" do
h = {a: 1, b: 2,}
h.size.should == 2
h.should == {a: 1, b: 2}
end
it "recognizes '=' at the end of the key" do
eval("{:a==>1}").should == {:"a=" => 1}
eval("{:a= =>1}").should == {:"a=" => 1}
eval("{:a= => 1}").should == {:"a=" => 1}
end
it "with '==>' in the middle raises SyntaxError" do
-> { eval("{:a ==> 1}") }.should raise_error(SyntaxError)
end
it "constructs a new hash with the given elements" do
{foo: 123}.should == {foo: 123}
h = {rbx: :cool, specs: 'fail_sometimes'}
{rbx: :cool, specs: 'fail_sometimes'}.should == h
end
it "ignores a hanging comma" do
{foo: 123,}.should == {foo: 123}
h = {rbx: :cool, specs: 'fail_sometimes'}
{rbx: :cool, specs: 'fail_sometimes',}.should == h
end
it "accepts mixed 'key: value' and 'key => value' syntax" do
h = {:a => 1, :b => 2, "c" => 3}
{a: 1, b: 2, "c" => 3}.should == h
end
it "accepts mixed 'key: value', 'key => value' and '\"key\"': value' syntax" do
h = {:a => 1, :b => 2, "c" => 3, :d => 4}
eval('{a: 1, :b => 2, "c" => 3, "d": 4}').should == h
end
it "expands an '**{}' element into the containing Hash literal initialization" do
{a: 1, **{b: 2}, c: 3}.should == {a: 1, b: 2, c: 3}
end
it "expands an '**obj' element into the containing Hash literal initialization" do
h = {b: 2, c: 3}
{**h, a: 1}.should == {b: 2, c: 3, a: 1}
{a: 1, **h}.should == {a: 1, b: 2, c: 3}
{a: 1, **h, c: 4}.should == {a: 1, b: 2, c: 4}
end
it "expands a BasicObject using ** into the containing Hash literal initialization" do
h = BasicObject.new
def h.to_hash; {:b => 2, :c => 3}; end
{**h, a: 1}.should == {b: 2, c: 3, a: 1}
{a: 1, **h}.should == {a: 1, b: 2, c: 3}
{a: 1, **h, c: 4}.should == {a: 1, b: 2, c: 4}
end
it "expands an '**{}' element with the last key/value pair taking precedence" do
-> {
@h = eval "{a: 1, **{a: 2, b: 3, c: 1}, c: 3}"
}.should complain(/key :a is duplicated|duplicated key/)
@h.should == {a: 2, b: 3, c: 3}
end
it "merges multiple nested '**obj' in Hash literals" do
-> {
@h = eval "{a: 1, **{a: 2, **{b: 3, **{c: 4}}, **{d: 5}, }, **{d: 6}}"
}.should complain(/key :a is duplicated|duplicated key/)
@h.should == {a: 2, b: 3, c: 4, d: 6}
end
it "calls #to_hash to expand an '**obj' element" do
obj = mock("hash splat")
obj.should_receive(:to_hash).and_return({b: 2, d: 4})
{a: 1, **obj, c: 3}.should == {a:1, b: 2, c: 3, d: 4}
end
ruby_version_is ""..."2.7" do
it "raises a TypeError if any splatted elements keys are not symbols" do
h = {1 => 2, b: 3}
-> { {a: 1, **h} }.should raise_error(TypeError)
end
end
ruby_version_is "2.7" do
it "allows splatted elements keys that are not symbols" do
h = {1 => 2, b: 3}
{a: 1, **h}.should == {a: 1, 1 => 2, b: 3}
end
end
it "raises a TypeError if #to_hash does not return a Hash" do
obj = mock("hash splat")
obj.should_receive(:to_hash).and_return(obj)
-> { {**obj} }.should raise_error(TypeError)
end
it "does not change encoding of literal string keys during creation" do
binary_hash = HashStringsBinary.literal_hash
utf8_hash = HashStringsUTF8.literal_hash
usascii_hash = HashStringsUSASCII.literal_hash
binary_hash.keys.first.encoding.should == Encoding::BINARY
binary_hash.keys.first.should == utf8_hash.keys.first
utf8_hash.keys.first.encoding.should == Encoding::UTF_8
utf8_hash.keys.first.should == usascii_hash.keys.first
usascii_hash.keys.first.encoding.should == Encoding::US_ASCII
end
end
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