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require_relative '../../spec_helper'
describe "Hash#transform_values" do
before :each do
@hash = { a: 1, b: 2, c: 3 }
end
it "returns new hash" do
ret = @hash.transform_values(&:succ)
ret.should_not equal(@hash)
ret.should be_an_instance_of(Hash)
end
it "sets the result as transformed values with the given block" do
@hash.transform_values(&:succ).should == { a: 2, b: 3, c: 4 }
end
it "makes both hashes to share keys" do
key = [1, 2, 3]
new_hash = { key => 1 }.transform_values(&:succ)
new_hash[key].should == 2
new_hash.keys[0].should equal(key)
end
context "when no block is given" do
it "returns a sized Enumerator" do
enumerator = @hash.transform_values
enumerator.should be_an_instance_of(Enumerator)
enumerator.size.should == @hash.size
enumerator.each(&:succ).should == { a: 2, b: 3, c: 4 }
end
end
it "returns a Hash instance, even on subclasses" do
klass = Class.new(Hash)
h = klass.new
h[:foo] = 42
r = h.transform_values{|v| 2 * v}
r[:foo].should == 84
r.class.should == Hash
end
end
describe "Hash#transform_values!" do
before :each do
@hash = { a: 1, b: 2, c: 3 }
@initial_pairs = @hash.dup
end
it "returns self" do
@hash.transform_values!(&:succ).should equal(@hash)
end
it "updates self as transformed values with the given block" do
@hash.transform_values!(&:succ)
@hash.should == { a: 2, b: 3, c: 4 }
end
it "partially modifies the contents if we broke from the block" do
@hash.transform_values! do |v|
break if v == 3
100 + v
end
@hash.should == { a: 101, b: 102, c: 3}
end
context "when no block is given" do
it "returns a sized Enumerator" do
enumerator = @hash.transform_values!
enumerator.should be_an_instance_of(Enumerator)
enumerator.size.should == @hash.size
enumerator.each(&:succ)
@hash.should == { a: 2, b: 3, c: 4 }
end
end
describe "on frozen instance" do
before :each do
@hash.freeze
end
it "raises a FrozenError on an empty hash" do
->{ {}.freeze.transform_values!(&:succ) }.should raise_error(FrozenError)
end
it "keeps pairs and raises a FrozenError" do
->{ @hash.transform_values!(&:succ) }.should raise_error(FrozenError)
@hash.should == @initial_pairs
end
context "when no block is given" do
it "does not raise an exception" do
@hash.transform_values!.should be_an_instance_of(Enumerator)
end
end
end
end
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