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Diffstat (limited to 'spec/ruby/core/hash/transform_values_spec.rb')
-rw-r--r-- | spec/ruby/core/hash/transform_values_spec.rb | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/transform_values_spec.rb b/spec/ruby/core/hash/transform_values_spec.rb new file mode 100644 index 0000000000..7e4ff45bea --- /dev/null +++ b/spec/ruby/core/hash/transform_values_spec.rb @@ -0,0 +1,71 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +ruby_version_is "2.4" do + 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 + + 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 + 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 + + 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 "keeps pairs and raises a RuntimeError" do + ->{ @hash.transform_values!(&:succ) }.should raise_error(RuntimeError) + @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 +end |