} catch (DictionaryException e) {
            assertTrue(e.getMessage().contains("Failed to parse"));
        }
    }

    // Test update with InputStream
    public void test_update_withInputStream() throws IOException {
        String content = "new1\n" + "new2\n" + "new3\n";

        InputStream is = new ByteArrayInputStream(content.getBytes(StandardCharsets.UTF_8));
        stopwordsFile.update(is);

        assertArrayEquals(new String[] { "a ", " b" }, item.getInputs());
        assertEquals("c", item.getOutput());
    }

    // Test update method with InputStream
    public void test_update_withInputStream() throws Exception {
        writeTestFile("a,b => c\n");

        String newContent = "x,y => z\n";
        InputStream inputStream = new ByteArrayInputStream(newContent.getBytes(StandardCharsets.UTF_8));