throw new IOException("Test exception");
            }
        };

        try {
            stopwordsFile.reload(null, failingStream);
            fail("Should throw DictionaryException");
        } catch (DictionaryException e) {
            assertTrue(e.getMessage().contains("Failed to parse"));
        }
    }

    // Test update with InputStream

        charMappingFile.update(updateItem1);

        // Second update should fail due to mismatch
        try {
            charMappingFile.update(updateItem2);
            fail("Should throw DictionaryException");
        } catch (DictionaryException e) {
            assertTrue(e.getMessage().contains("Mapping file was updated"));
        }
    }

    // Test reload with IOException