diff options
Diffstat (limited to 'activesupport/test/core_ext/hash/transform_values_test.rb')
-rw-r--r-- | activesupport/test/core_ext/hash/transform_values_test.rb | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/hash/transform_values_test.rb b/activesupport/test/core_ext/hash/transform_values_test.rb new file mode 100644 index 0000000000..45ed11fef7 --- /dev/null +++ b/activesupport/test/core_ext/hash/transform_values_test.rb @@ -0,0 +1,61 @@ +require 'abstract_unit' +require 'active_support/core_ext/hash/indifferent_access' +require 'active_support/core_ext/hash/transform_values' + +class TransformValuesTest < ActiveSupport::TestCase + test "transform_values returns a new hash with the values computed from the block" do + original = { a: 'a', b: 'b' } + mapped = original.transform_values { |v| v + '!' } + + assert_equal({ a: 'a', b: 'b' }, original) + assert_equal({ a: 'a!', b: 'b!' }, mapped) + end + + test "transform_values! modifies the values of the original" do + original = { a: 'a', b: 'b' } + mapped = original.transform_values! { |v| v + '!' } + + assert_equal({ a: 'a!', b: 'b!' }, original) + assert_same original, mapped + end + + test "indifferent access is still indifferent after mapping values" do + original = { a: 'a', b: 'b' }.with_indifferent_access + mapped = original.transform_values { |v| v + '!' } + + assert_equal 'a!', mapped[:a] + assert_equal 'a!', mapped['a'] + end + + # This is to be consistent with the behavior of Ruby's built in methods + # (e.g. #select, #reject) as of 2.2 + test "default values do not persist during mapping" do + original = Hash.new('foo') + original[:a] = 'a' + mapped = original.transform_values { |v| v + '!' } + + assert_equal 'a!', mapped[:a] + assert_nil mapped[:b] + end + + test "default procs do not persist after mapping" do + original = Hash.new { 'foo' } + original[:a] = 'a' + mapped = original.transform_values { |v| v + '!' } + + assert_equal 'a!', mapped[:a] + assert_nil mapped[:b] + end + + test "transform_values returns an Enumerator if no block is given" do + original = { a: 'a', b: 'b' } + enumerator = original.transform_values + assert_equal Enumerator, enumerator.class + end + + test "transform_values is chainable with Enumerable methods" do + original = { a: 'a', b: 'b' } + mapped = original.transform_values.with_index { |v, i| [v, i].join } + assert_equal({ a: 'a0', b: 'b1' }, mapped) + end +end |