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401b64c4e8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
77 lines
2.5 KiB
Ruby
77 lines
2.5 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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require_relative 'shared/iteration'
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require_relative 'shared/update'
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describe "Hash#merge" do
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it "returns a new hash by combining self with the contents of other" do
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h = { 1 => :a, 2 => :b, 3 => :c }.merge(a: 1, c: 2)
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h.should == { c: 2, 1 => :a, 2 => :b, a: 1, 3 => :c }
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hash = { a: 1, b: 2 }
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{}.merge(hash).should == hash
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hash.merge({}).should == hash
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h = { 1 => :a, 2 => :b, 3 => :c }.merge(1 => :b)
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h.should == { 1 => :b, 2 => :b, 3 => :c }
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h = { 1 => :a, 2 => :b }.merge(1 => :b, 3 => :c)
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h.should == { 1 => :b, 2 => :b, 3 => :c }
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end
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it "sets any duplicate key to the value of block if passed a block" do
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h1 = { a: 2, b: 1, d: 5 }
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h2 = { a: -2, b: 4, c: -3 }
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r = h1.merge(h2) { |k,x,y| nil }
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r.should == { a: nil, b: nil, c: -3, d: 5 }
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r = h1.merge(h2) { |k,x,y| "#{k}:#{x+2*y}" }
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r.should == { a: "a:-2", b: "b:9", c: -3, d: 5 }
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lambda {
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h1.merge(h2) { |k, x, y| raise(IndexError) }
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}.should raise_error(IndexError)
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r = h1.merge(h1) { |k,x,y| :x }
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r.should == { a: :x, b: :x, d: :x }
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end
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it "tries to convert the passed argument to a hash using #to_hash" do
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obj = mock('{1=>2}')
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obj.should_receive(:to_hash).and_return({ 1 => 2 })
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{ 3 => 4 }.merge(obj).should == { 1 => 2, 3 => 4 }
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end
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it "does not call to_hash on hash subclasses" do
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{ 3 => 4 }.merge(HashSpecs::ToHashHash[1 => 2]).should == { 1 => 2, 3 => 4 }
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end
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it "returns subclass instance for subclasses" do
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HashSpecs::MyHash[1 => 2, 3 => 4].merge({ 1 => 2 }).should be_an_instance_of(HashSpecs::MyHash)
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HashSpecs::MyHash[].merge({ 1 => 2 }).should be_an_instance_of(HashSpecs::MyHash)
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{ 1 => 2, 3 => 4 }.merge(HashSpecs::MyHash[1 => 2]).class.should == Hash
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{}.merge(HashSpecs::MyHash[1 => 2]).class.should == Hash
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end
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it "processes entries with same order as each()" do
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h = { 1 => 2, 3 => 4, 5 => 6, "x" => nil, nil => 5, [] => [] }
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merge_pairs = []
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each_pairs = []
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h.each_pair { |k, v| each_pairs << [k, v] }
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h.merge(h) { |k, v1, v2| merge_pairs << [k, v1] }
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merge_pairs.should == each_pairs
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end
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end
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describe "Hash#merge!" do
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it_behaves_like :hash_update, :merge!
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it "does not raise an exception if changing the value of an existing key during iteration" do
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hash = {1 => 2, 3 => 4, 5 => 6}
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hash2 = {1 => :foo, 3 => :bar}
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hash.each { hash.merge!(hash2) }
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hash.should == {1 => :foo, 3 => :bar, 5 => 6}
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end
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end
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