diff options
Diffstat (limited to 'activesupport/test/core_ext/hash/transform_keys_test.rb')
-rw-r--r-- | activesupport/test/core_ext/hash/transform_keys_test.rb | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/hash/transform_keys_test.rb b/activesupport/test/core_ext/hash/transform_keys_test.rb new file mode 100644 index 0000000000..a7e12117f3 --- /dev/null +++ b/activesupport/test/core_ext/hash/transform_keys_test.rb @@ -0,0 +1,32 @@ +require 'abstract_unit' +require 'active_support/core_ext/hash/keys' + +class TransformKeysTest < ActiveSupport::TestCase + test "transform_keys returns a new hash with the keys computed from the block" do + original = { a: 'a', b: 'b' } + mapped = original.transform_keys { |k| "#{k}!".to_sym } + + assert_equal({ a: 'a', b: 'b' }, original) + assert_equal({ a!: 'a', b!: 'b' }, mapped) + end + + test "transform_keys! modifies the keys of the original" do + original = { a: 'a', b: 'b' } + mapped = original.transform_keys! { |k| "#{k}!".to_sym } + + assert_equal({ a!: 'a', b!: 'b' }, original) + assert_same original, mapped + end + + test "transform_keys returns an Enumerator if no block is given" do + original = { a: 'a', b: 'b' } + enumerator = original.transform_keys + assert_equal Enumerator, enumerator.class + end + + test "transform_keys is chainable with Enumerable methods" do + original = { a: 'a', b: 'b' } + mapped = original.transform_keys.with_index { |k, i| [k, i].join.to_sym } + assert_equal({ a0: 'a', b1: 'b' }, mapped) + end +end |