[Java] Move CapturingPrintStream to test-support.

aeron-system-tests/src/test/java/io/aeron/cluster/ClusterToolTest.java

@@ -15,6 +15,7 @@
  */
 package io.aeron.cluster;
 
+import io.aeron.test.CapturingPrintStream;
 import io.aeron.test.EventLogExtension;
 import io.aeron.test.InterruptAfter;
 import io.aeron.test.InterruptingTestCallback;
@@ -38,7 +39,6 @@
 import java.util.regex.Pattern;
 
 import static io.aeron.test.cluster.TestCluster.aCluster;
-import static java.nio.charset.StandardCharsets.US_ASCII;
 import static java.nio.file.StandardOpenOption.CREATE_NEW;
 import static java.nio.file.StandardOpenOption.WRITE;
 import static org.hamcrest.MatcherAssert.assertThat;
@@ -437,29 +437,4 @@ private void testSeedRecordingLogFromSnapshot(final Path emptyClusterDir, final
         // e.g. expected: <2021-09-27T09:49:22.756944756Z> but was: <2021-09-27T09:49:22.756944Z>
         assertEquals(logLastModifiedTime.toMillis(), Files.getLastModifiedTime(backupLogFile).toMillis());
     }
-
-    static class CapturingPrintStream
-    {
-        private final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
-        private final PrintStream printStream = new PrintStream(byteArrayOutputStream);
-
-        PrintStream resetAndGetPrintStream()
-        {
-            byteArrayOutputStream.reset();
-            return printStream;
-        }
-
-        String flushAndGetContent()
-        {
-            printStream.flush();
-            try
-            {
-                return byteArrayOutputStream.toString(US_ASCII.name());
-            }
-            catch (final UnsupportedEncodingException ex)
-            {
-                throw new RuntimeException(ex);
-            }
-        }
-    }
 }

aeron-test-support/src/main/java/io/aeron/test/CapturingPrintStream.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2014-2024 Real Logic Limited.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.aeron.test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static java.nio.charset.StandardCharsets.US_ASCII;
+
+public class CapturingPrintStream
+{
+    private final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+    private final PrintStream printStream = new PrintStream(byteArrayOutputStream);
+
+    public PrintStream resetAndGetPrintStream()
+    {
+        byteArrayOutputStream.reset();
+        return printStream;
+    }
+
+    public String flushAndGetContent()
+    {
+        printStream.flush();
+        return byteArrayOutputStream.toString(US_ASCII);
+    }
+}