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Diffstat (limited to 'spec/ruby/core/hash/slice_spec.rb')
-rw-r--r-- | spec/ruby/core/hash/slice_spec.rb | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/slice_spec.rb b/spec/ruby/core/hash/slice_spec.rb new file mode 100644 index 0000000000..15c9c815ff --- /dev/null +++ b/spec/ruby/core/hash/slice_spec.rb @@ -0,0 +1,36 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +ruby_version_is "2.5" do + describe "Hash#slice" do + before :each do + @hash = { a: 1, b: 2, c: 3 } + end + + it "returns new hash" do + ret = @hash.slice + ret.should_not equal(@hash) + ret.should be_an_instance_of(Hash) + end + + it "returns the requested subset" do + @hash.slice(:c, :a).should == { c: 3, a: 1 } + end + + it "returns a hash ordered in the order of the requested keys" do + @hash.slice(:c, :a).keys.should == [:c, :a] + end + + it "returns only the keys of the original hash" do + @hash.slice(:a, :chunky_bacon).should == { a: 1 } + end + + it "returns a Hash instance, even on subclasses" do + klass = Class.new(Hash) + h = klass.new + h[:foo] = 42 + r = h.slice(:foo) + r.should == {foo: 42} + r.class.should == Hash + end + end +end |