it { is_expected.to run.with_params(['one', 'two'], ['two', 'three'], ['one', 'three']).and_return(['one', 'two', 'three']) }
it { is_expected.to run.with_params(['one', 'two'], ['three', 'four'], ['one', 'two', 'three'], ['four']).and_return(['one', 'two', 'three', 'four']) }
it { is_expected.to run.with_params(['ốńə', 'ţשׂợ'], ['ŧĥяếệ', 'ƒởųŗ'], ['ốńə', 'ţשׂợ', 'ŧĥяếệ'], ['ƒởųŗ']).and_return(['ốńə', 'ţשׂợ', 'ŧĥяếệ', 'ƒởųŗ']) }
it { is_expected.to run.with_params(['one', 'two'], ['two', 'three'], ['one', 'three']).and_return(['one', 'two', 'three']) }
it { is_expected.to run.with_params(['one', 'two'], ['three', 'four'], ['one', 'two', 'three'], ['four']).and_return(['one', 'two', 'three', 'four']) }
it { is_expected.to run.with_params(['ốńə', 'ţשׂợ'], ['ŧĥяếệ', 'ƒởųŗ'], ['ốńə', 'ţשׂợ', 'ŧĥяếệ'], ['ƒởųŗ']).and_return(['ốńə', 'ţשׂợ', 'ŧĥяếệ', 'ƒởųŗ']) }