### Question:
BooleanConverterFactory implements TypeConverterFactory<String, Boolean> { @Override public TypeConverter<String, Boolean> createTypeConverter() { return value -> { if (TRUE_VALUES.contains(value.trim().toLowerCase())) { return Boolean.TRUE; } else if (FALSE_VALUES.contains(value.trim().toLowerCase())) { return Boolean.FALSE; } try { return Boolean.parseBoolean(value.trim()); } catch (NumberFormatException e) { throw new TypeConverterException("Failed to decode Boolean value '" + value + "'.", e); } }; }  @Override TypeConverter<String, Boolean> createTypeConverter(); @Override TypeConverterDescriptor<Class<String>, Class<Boolean>> getTypeConverterDescriptor();  }### Answer:
@Test public void testBoolean() { String data = "Y"; BooleanConverterFactory booleanConverterFactory = new BooleanConverterFactory(); Boolean result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertTrue(result); data = "y"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertTrue(result); data = "Yes"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertTrue(result); data = "yes"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertTrue(result); data = "true"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertTrue(result); data = "1"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertTrue(result); data = "No"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertFalse(result); data = "no"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertFalse(result); data = "N"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertFalse(result); data = "n"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertFalse(result); data = "false"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertFalse(result); data = "0"; result = booleanConverterFactory.createTypeConverter().convert(data); assertNotNull(result); assertFalse(result); assertEquals(false, booleanConverterFactory.createTypeConverter().convert("eeee")); }