InputStream is = new ByteArrayInputStream(input.getBytes(StandardCharsets.UTF_8));

        InputStreamThread thread = new InputStreamThread(is, StandardCharsets.UTF_8, 5, null);
        thread.start();
        thread.join(1000);

        String output = thread.getOutput();
        assertTrue(output.contains("line1"));
        assertTrue(output.contains("line2"));
        assertTrue(output.contains("line3"));
    }

    @Test

        startLatch.countDown();

        // Wait for writer thread to complete
        writerThread.join(1000);

        // Wait for all reader threads to complete
        for (Thread thread : readerThreads) {
            thread.join(testDurationMs + 1000);
        }

        // Verify that alive was changed to false

    }

    /**
     * Joins array or list elements into a single space-separated string.
     *
     * @param input the input object (String[], List, or String)
     * @return joined string with elements separated by spaces, or empty string if invalid input
     */
    public static String join(final Object input) {
        String[] values = null;

        // Start all threads
        for (Thread thread : threads) {
            thread.start();
        }

        // Wait for all threads to complete
        for (Thread thread : threads) {
            thread.join();
        }

        // Verify no exceptions occurred
        for (int i = 0; i < threadCount; i++) {
            assertNull(exceptions[i], "Thread " + i + " threw exception");

            }
        });

        // Start both threads
        threads[0].start();
        threads[1].start();

        // Wait for completion
        threads[0].join();
        threads[1].join();

        // Verify no exceptions occurred (the main goal is no ConcurrentModificationException)
        assertNull(exceptions[0], "Add thread threw exception");

            cmdList.add(StringUtils.join(webConfigIds, ','));
        }
        if (fileConfigIds != null && fileConfigIds.length > 0) {
            cmdList.add("-f");
            cmdList.add(StringUtils.join(fileConfigIds, ','));
        }
        if (dataConfigIds != null && dataConfigIds.length > 0) {
            cmdList.add("-d");
            cmdList.add(StringUtils.join(dataConfigIds, ','));
        }

      <replaceConfiguration name="Join combined with collect" suppressId="join_with_collect" problemDescriptor="Use a `join` method overload" text="$callJoin$($sep$, $callCollect$($src$, $transform$))" recursive="false" caseInsensitive="false" type="JAVA" pattern_context="default" reformatAccordingToStyle="true" shortenFQN="true" useStaticImport="true" replacement="org.gradle.util.internal.CollectionUtils.join($sep$, $src$, $transform$)">

    <example>${fe:sdh(doc.similar_docs_hash)}</example>
  </function>

  <function>
    <description>Concatenate strings.</description>
    <name>join</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.lang.String join(java.lang.Object)</function-signature>
    <example>${fe:join(values)}</example>
  </function>

  <function>
    <description>

        if (!errors.isEmpty()) {
            def changes = errors + warnings
            return acceptOrReject(member, changes, Violation.error(member, changes.join(" ")))
        }
        if (!warnings.isEmpty()) {
            return Violation.warning(member, warnings.join(" "))
        }
        return null
    }

    private static List<Boolean> typeParametersNullabilityOf(CtClass ctClass) {

            Throwable result = exception.fillInStackTrace();
            assertNull(result);
        });

        thread1.start();
        thread2.start();

        try {
            thread1.join();
            thread2.join();
        } catch (InterruptedException e) {
            fail("Thread interrupted");
        }
    }

    @Test
    public void test_genericTypeSafety_withSubclass() {