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# frozen_string_literal: true
require_relative '../../test_helper'
# when these tests are run under Ruby 1.8.7, they will use the
# self-defined Array#sample method in lib/extensions/array and will test whether it
# behaves as the built-in Array#sample method from Ruby 1.9 or greater.
# Under Ruby 1.9, they simply use the built-in Array#sample method
class TestArraySampleMethodCompatibility < Test::Unit::TestCase
def test_returns_nil_or_empty_array_with_empty_source
source = []
result = source.sample
assert_nil result
result = source.sample(1)
assert_empty(result)
end
def test_returns_one_array_elem_without_param
source = %w[foo bar]
result = source.sample
assert_includes source, result
end
def test_returns_empty_array_with_param_zero
source = %w[foo bar]
result = source.sample(0)
assert_empty(result)
end
def test_returns_an_array_with_integer_param
source = %w[foo bar baz]
result = source.sample(2)
assert_kind_of Array, result
assert_equal(2, result.length)
assert_empty(result - source)
end
def test_returns_source_array_with_integer_param_equal_or_bigger_than_source_length
source = %w[foo bar]
result = source.sample(2)
assert_kind_of Array, result
assert_predicate(source.sort <=> result.sort, :zero?)
result = source.sample(3)
assert_kind_of Array, result
assert_predicate(source.sort <=> result.sort, :zero?)
end
def test_raises_argument_error_with_negative_param
source = %w[foo bar]
assert_raise ArgumentError do
source.sample(-1)
end
end
end
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