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* Other ruby implementations use the spec/ruby directory. [Misc #13792] [ruby-core:82287] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
50 lines
1.5 KiB
Ruby
50 lines
1.5 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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describe "Hash#assoc" do
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before :each do
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@h = {apple: :green, orange: :orange, grape: :green, banana: :yellow}
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end
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it "returns an Array if the argument is == to a key of the Hash" do
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@h.assoc(:apple).should be_an_instance_of(Array)
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end
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it "returns a 2-element Array if the argument is == to a key of the Hash" do
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@h.assoc(:grape).size.should == 2
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end
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it "sets the first element of the Array to the located key" do
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@h.assoc(:banana).first.should == :banana
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end
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it "sets the last element of the Array to the value of the located key" do
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@h.assoc(:banana).last.should == :yellow
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end
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it "only returns the first matching key-value pair for identity hashes" do
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# Avoid literal String keys in Hash#[]= due to https://bugs.ruby-lang.org/issues/12855
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h = {}.compare_by_identity
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k1 = 'pear'
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h[k1] = :red
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k2 = 'pear'
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h[k2] = :green
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h.size.should == 2
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h.keys.grep(/pear/).size.should == 2
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h.assoc('pear').should == ['pear', :red]
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end
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it "uses #== to compare the argument to the keys" do
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@h[1.0] = :value
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1.should == 1.0
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@h.assoc(1).should == [1.0, :value]
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end
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it "returns nil if the argument is not a key of the Hash" do
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@h.assoc(:green).should be_nil
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end
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it "returns nil if the argument is not a key of the Hash even when there is a default" do
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Hash.new(42).merge!( foo: :bar ).assoc(42).should be_nil
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Hash.new{|h, k| h[k] = 42}.merge!( foo: :bar ).assoc(42).should be_nil
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end
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end
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