diff options
Diffstat (limited to 'spec/ruby/core/hash/rassoc_spec.rb')
-rw-r--r-- | spec/ruby/core/hash/rassoc_spec.rb | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/rassoc_spec.rb b/spec/ruby/core/hash/rassoc_spec.rb new file mode 100644 index 0000000000..79c633f95e --- /dev/null +++ b/spec/ruby/core/hash/rassoc_spec.rb @@ -0,0 +1,42 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Hash#rassoc" do + before :each do + @h = {apple: :green, orange: :orange, grape: :green, banana: :yellow} + end + + it "returns an Array if the argument is a value of the Hash" do + @h.rassoc(:green).should be_an_instance_of(Array) + end + + it "returns a 2-element Array if the argument is a value of the Hash" do + @h.rassoc(:orange).size.should == 2 + end + + it "sets the first element of the Array to the key of the located value" do + @h.rassoc(:yellow).first.should == :banana + end + + it "sets the last element of the Array to the located value" do + @h.rassoc(:yellow).last.should == :yellow + end + + it "only returns the first matching key-value pair" do + @h.rassoc(:green).should == [:apple, :green] + end + + it "uses #== to compare the argument to the values" do + @h[:key] = 1.0 + 1.should == 1.0 + @h.rassoc(1).should eql [:key, 1.0] + end + + it "returns nil if the argument is not a value of the Hash" do + @h.rassoc(:banana).should be_nil + end + + it "returns nil if the argument is not a value of the Hash even when there is a default" do + Hash.new(42).merge!( foo: :bar ).rassoc(42).should be_nil + Hash.new{|h, k| h[k] = 42}.merge!( foo: :bar ).rassoc(42).should be_nil + end +end |