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 | 42 |
1 files changed, 29 insertions, 13 deletions
diff --git a/activesupport/test/core_ext/hash/transform_keys_test.rb b/activesupport/test/core_ext/hash/transform_keys_test.rb index 99af274614..7a11d827f8 100644 --- a/activesupport/test/core_ext/hash/transform_keys_test.rb +++ b/activesupport/test/core_ext/hash/transform_keys_test.rb @@ -1,46 +1,62 @@ -require 'abstract_unit' -require 'active_support/core_ext/hash/keys' +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' } + 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) + 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' } + 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" }, original) assert_same original, mapped end test "transform_keys returns a sized Enumerator if no block is given" do - original = { a: 'a', b: 'b' } + original = { a: "a", b: "b" } enumerator = original.transform_keys assert_equal original.size, enumerator.size assert_equal Enumerator, enumerator.class end test "transform_keys! returns a sized Enumerator if no block is given" do - original = { a: 'a', b: 'b' } + original = { a: "a", b: "b" } enumerator = original.transform_keys! assert_equal original.size, enumerator.size assert_equal Enumerator, enumerator.class end test "transform_keys is chainable with Enumerable methods" do - original = { a: 'a', b: 'b' } + 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) + assert_equal({ a0: "a", b1: "b" }, mapped) end test "transform_keys! is chainable with Enumerable methods" do - original = { a: 'a', b: 'b' } + original = { a: "a", b: "b" } original.transform_keys!.with_index { |k, i| [k, i].join.to_sym } - assert_equal({ a0: 'a', b1: 'b' }, original) + assert_equal({ a0: "a", b1: "b" }, original) + end + + test "transform_keys returns a Hash instance when self is inherited from Hash" do + class HashDescendant < ::Hash + def initialize(elements = nil) + super(elements) + (elements || {}).each_pair { |key, value| self[key] = value } + end + end + + original = HashDescendant.new(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) + assert_equal(::Hash, mapped.class) end end |