### Question:
Base1SubFieldPackager extends ISOBasePackager { protected ISOFieldPackager getBitMapfieldPackager() { return fld[0]; }  int unpack(ISOComponent m, byte[] b); @Override byte[] pack(ISOComponent m);  }### Answer:
@Test public void testGetBitMapfieldPackager() throws Throwable { Base1SubFieldPackager f126Packager = new Base1Packager.F126Packager(); Base1_BITMAP126 result = (Base1_BITMAP126) f126Packager.getBitMapfieldPackager(); assertEquals(2, result.getMaxPackedLength(), "result.getMaxPackedLength()"); }
@Test public void testGetBitMapfieldPackagerThrowsNullPointerException() throws Throwable { Base1SubFieldPackager base1SubFieldPackager = new Base1SubFieldPackager(); try { base1SubFieldPackager.getBitMapfieldPackager(); fail("Expected NullPointerException to be thrown"); } catch (NullPointerException ex) { if (isJavaVersionAtMost(JAVA_14)) { assertNull(ex.getMessage(), "ex.getMessage()"); } else { assertEquals("Cannot load from object array because \"this.fld\" is null", ex.getMessage(), "ex.getMessage()"); } } }