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# frozen_string_literal: true
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 a sized Enumerator if no block is given" do
original = { a: "a", b: "b" }
enumerator = original.transform_values
assert_equal original.size, enumerator.size
assert_equal Enumerator, enumerator.class
end
test "transform_values! returns a sized Enumerator if no block is given" do
original = { a: "a", b: "b" }
enumerator = original.transform_values!
assert_equal original.size, enumerator.size
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
test "transform_values! is chainable with Enumerable methods" do
original = { a: "a", b: "b" }
original.transform_values!.with_index { |v, i| [v, i].join }
assert_equal({ a: "a0", b: "b1" }, original)
end
end
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