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require_relative '../../spec_helper'
describe "Hash#transform_keys" do
before :each do
@hash = { a: 1, b: 2, c: 3 }
end
it "returns new hash" do
ret = @hash.transform_keys(&:succ)
ret.should_not equal(@hash)
ret.should be_an_instance_of(Hash)
end
it "sets the result as transformed keys with the given block" do
@hash.transform_keys(&:succ).should == { b: 1, c: 2, d: 3 }
end
it "keeps last pair if new keys conflict" do
@hash.transform_keys { |_| :a }.should == { a: 3 }
end
it "makes both hashes to share values" do
value = [1, 2, 3]
new_hash = { a: value }.transform_keys(&:upcase)
new_hash[:A].should equal(value)
end
context "when no block is given" do
it "returns a sized Enumerator" do
enumerator = @hash.transform_keys
enumerator.should be_an_instance_of(Enumerator)
enumerator.size.should == @hash.size
enumerator.each(&:succ).should == { b: 1, c: 2, d: 3 }
end
end
it "returns a Hash instance, even on subclasses" do
klass = Class.new(Hash)
h = klass.new
h[:foo] = 42
r = h.transform_keys{|v| :"x#{v}"}
r.keys.should == [:xfoo]
r.class.should == Hash
end
it "allows a hash argument" do
@hash.transform_keys({ a: :A, b: :B, c: :C }).should == { A: 1, B: 2, C: 3 }
end
it "allows a partial transformation of keys when using a hash argument" do
@hash.transform_keys({ a: :A, c: :C }).should == { A: 1, b: 2, C: 3 }
end
it "allows a combination of hash and block argument" do
@hash.transform_keys({ a: :A }, &:to_s).should == { A: 1, 'b' => 2, 'c' => 3 }
end
end
describe "Hash#transform_keys!" do
before :each do
@hash = { a: 1, b: 2, c: 3, d: 4 }
@initial_pairs = @hash.dup
end
it "returns self" do
@hash.transform_keys!(&:succ).should equal(@hash)
end
it "updates self as transformed values with the given block" do
@hash.transform_keys!(&:to_s)
@hash.should == { 'a' => 1, 'b' => 2, 'c' => 3, 'd' => 4 }
end
it "prevents conflicts between new keys and old ones" do
@hash.transform_keys!(&:succ)
@hash.should == { b: 1, c: 2, d: 3, e: 4 }
end
ruby_version_is ""..."3.0.2" do # https://bugs.ruby-lang.org/issues/17735
it "returns the processed keys if we break from the block" do
@hash.transform_keys! do |v|
break if v == :c
v.succ
end
@hash.should == { b: 1, c: 2 }
end
end
ruby_version_is "3.0.2" do
it "returns the processed keys and non evaluated keys if we break from the block" do
@hash.transform_keys! do |v|
break if v == :c
v.succ
end
@hash.should == { b: 1, c: 2, d: 4 }
end
end
it "keeps later pair if new keys conflict" do
@hash.transform_keys! { |_| :a }.should == { a: 4 }
end
context "when no block is given" do
it "returns a sized Enumerator" do
enumerator = @hash.transform_keys!
enumerator.should be_an_instance_of(Enumerator)
enumerator.size.should == @hash.size
enumerator.each(&:upcase).should == { A: 1, B: 2, C: 3, D: 4 }
end
end
it "allows a hash argument" do
@hash.transform_keys!({ a: :A, b: :B, c: :C, d: :D })
@hash.should == { A: 1, B: 2, C: 3, D: 4 }
end
describe "on frozen instance" do
before :each do
@hash.freeze
end
it "raises a FrozenError on an empty hash" do
->{ {}.freeze.transform_keys!(&:upcase) }.should raise_error(FrozenError)
end
it "keeps pairs and raises a FrozenError" do
->{ @hash.transform_keys!(&:upcase) }.should raise_error(FrozenError)
@hash.should == @initial_pairs
end
it "raises a FrozenError on hash argument" do
->{ @hash.transform_keys!({ a: :A, b: :B, c: :C }) }.should raise_error(FrozenError)
end
context "when no block is given" do
it "does not raise an exception" do
@hash.transform_keys!.should be_an_instance_of(Enumerator)
end
end
end
end
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