diff options
Diffstat (limited to 'code/environments/production/modules/stdlib/spec/functions/seeded_rand_spec.rb')
-rw-r--r-- | code/environments/production/modules/stdlib/spec/functions/seeded_rand_spec.rb | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/code/environments/production/modules/stdlib/spec/functions/seeded_rand_spec.rb b/code/environments/production/modules/stdlib/spec/functions/seeded_rand_spec.rb new file mode 100644 index 0000000..9b7078a --- /dev/null +++ b/code/environments/production/modules/stdlib/spec/functions/seeded_rand_spec.rb @@ -0,0 +1,58 @@ +require 'spec_helper' + +describe 'seeded_rand' do + it { is_expected.not_to eq(nil) } + it { is_expected.to run.with_params.and_raise_error(ArgumentError, %r{wrong number of arguments}i) } + it { is_expected.to run.with_params(1).and_raise_error(ArgumentError, %r{wrong number of arguments}i) } + it { is_expected.to run.with_params(0, '').and_raise_error(ArgumentError, %r{first argument must be a positive integer}) } + it { is_expected.to run.with_params(1.5, '').and_raise_error(ArgumentError, %r{first argument must be a positive integer}) } + it { is_expected.to run.with_params(-10, '').and_raise_error(ArgumentError, %r{first argument must be a positive integer}) } + it { is_expected.to run.with_params('-10', '').and_raise_error(ArgumentError, %r{first argument must be a positive integer}) } + it { is_expected.to run.with_params('string', '').and_raise_error(ArgumentError, %r{first argument must be a positive integer}) } + it { is_expected.to run.with_params([], '').and_raise_error(ArgumentError, %r{first argument must be a positive integer}) } + it { is_expected.to run.with_params({}, '').and_raise_error(ArgumentError, %r{first argument must be a positive integer}) } + it { is_expected.to run.with_params(1, 1).and_raise_error(ArgumentError, %r{second argument must be a string}) } + it { is_expected.to run.with_params(1, []).and_raise_error(ArgumentError, %r{second argument must be a string}) } + it { is_expected.to run.with_params(1, {}).and_raise_error(ArgumentError, %r{second argument must be a string}) } + + it 'provides a random number strictly less than the given max' do + expect(seeded_rand(3, 'seed')).to satisfy { |n| n.to_i < 3 } # rubocop:disable Lint/AmbiguousBlockAssociation : Cannot parenthesize without break code or violating other Rubocop rules + end + + it 'provides a random number greater or equal to zero' do + expect(seeded_rand(3, 'seed')).to satisfy { |n| n.to_i >= 0 } # rubocop:disable Lint/AmbiguousBlockAssociation : Cannot parenthesize without break code or violating other Rubocop rules + end + + it "provides the same 'random' value on subsequent calls for the same host" do + expect(seeded_rand(10, 'seed')).to eql(seeded_rand(10, 'seed')) + end + + it 'allows seed to control the random value on a single host' do + first_random = seeded_rand(1000, 'seed1') + second_different_random = seeded_rand(1000, 'seed2') + + expect(first_random).not_to eql(second_different_random) + end + + it 'does not return different values for different hosts' do + val1 = seeded_rand(1000, 'foo', :host => 'first.host.com') + val2 = seeded_rand(1000, 'foo', :host => 'second.host.com') + + expect(val1).to eql(val2) + end + + def seeded_rand(max, seed, args = {}) + host = args[:host] || '127.0.0.1' + + # workaround not being able to use let(:facts) because some tests need + # multiple different hostnames in one context + scope.stubs(:lookupvar).with('::fqdn', {}).returns(host) + + scope.function_seeded_rand([max, seed]) + end + + context 'with UTF8 and double byte characters' do + it { is_expected.to run.with_params(1000, 'ǿňè') } + it { is_expected.to run.with_params(1000, '文字列') } + end +end |