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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
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