### Question:
PropertyValueConverter implements AttributeConverter<Object, String> { @Override public String convertToDatabaseColumn(Object attribute) { return attribute.toString(); }  @Override String convertToDatabaseColumn(Object attribute); @Override Object convertToEntityAttribute(String dbData);  }### Answer:
@Test public void convertToDatabaseColumn_convertsStringToString() { String testValue = "test"; String convertedValue = converter.convertToDatabaseColumn(testValue); assertTrue(testValue.equals(convertedValue)); }
@Test public void convertToDatabaseColumn_convertsIntegerToString() { int testValue = 42; int negativeTestValue = -42; String convertedValue = converter.convertToDatabaseColumn(testValue); String convertedNegativeValue = converter.convertToDatabaseColumn(negativeTestValue); assertTrue("42".equals(convertedValue)); assertTrue("-42".equals(convertedNegativeValue)); }
@Test public void convertToDatabaseColumn_convertsDoubleToString() { double testValue = 17.42; double negativeTestValue = -17.42; String convertedValue = converter.convertToDatabaseColumn(testValue); String convertedNegativeValue = converter.convertToDatabaseColumn(negativeTestValue); assertTrue("17.42".equals(convertedValue)); assertTrue("-17.42".equals(convertedNegativeValue)); }
@Test public void convertToDatabaseColumn_convertsBooleanToString() { boolean testValue = true; String convertedValue = converter.convertToDatabaseColumn(testValue); assertTrue("true".equals(convertedValue)); }