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require 'abstract_unit'
require 'active_support/core_ext/hash/transform_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
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