}
    }

    @Nested
    @DisplayName("Result Merging")
    class ResultMergingTests {

        @Test
        @DisplayName("should merge empty results")
        void shouldMergeEmptyResults() {
            UpgradeResult result1 = UpgradeResult.empty();
            UpgradeResult result2 = UpgradeResult.empty();

            UpgradeResult merged = result1.merge(result2);