### Question:
BASE24Channel extends BaseChannel { protected byte[] streamReceive() throws IOException { int i; byte[] buf = new byte[4096]; for (i=0; i<4096; i++) { int c = serverIn.read(); if (c == 0x3) break; buf[i] = (byte) c; } if (i == 4096) throw new IOException("message too long"); byte[] d = new byte[i]; System.arraycopy(buf, 0, d, 0, i); return d; } BASE24Channel();  BASE24Channel(String host, int port, ISOPackager p);  BASE24Channel(ISOPackager p);  BASE24Channel(ISOPackager p, ServerSocket serverSocket);   }### Answer:
@Test public void testStreamReceiveThrowsNullPointerException() throws Throwable { BASE24Channel bASE24Channel = new BASE24Channel(new ISO93APackager()); try { bASE24Channel.streamReceive(); fail("Expected NullPointerException to be thrown"); } catch (NullPointerException ex) { if (isJavaVersionAtMost(JAVA_14)) { assertNull(ex.getMessage(), "ex.getMessage()"); } else { assertEquals("Cannot invoke \"java.io.DataInputStream.read()\" because \"this.serverIn\" is null", ex.getMessage(), "ex.getMessage()"); } } }