How to use

FileParameters

in

junitparams

private Reader createProperReader() throws IOException {
  String filepath = fileParameters.value();
  String encoding = fileParameters.encoding();
  if (filepath.indexOf(':') < 0) {
    return new InputStreamReader(new FileInputStream(filepath), encoding);
  }
  String protocol = filepath.substring(0, filepath.indexOf(':'));
  String filename = filepath.substring(filepath.indexOf(':') + 1);
  if ("classpath".equals(protocol)) {
    return new InputStreamReader(getClass().getClassLoader().getResourceAsStream(filename), encoding);
  } else if ("file".equals(protocol)) {
    return new InputStreamReader(new FileInputStream(filename), encoding);
  }
  throw new IllegalArgumentException("Unknown file access protocol. Only 'file' and 'classpath' are supported!");
}

private Object[] paramsFromFile() {
  try {
    Reader reader = createProperReader();
    DataMapper mapper = fileParameters.mapper().newInstance();
    try {
      return mapper.map(reader);
    } finally {
      reader.close();
    }
  } catch (Exception e) {
    e.printStackTrace();
    throw new RuntimeException(
        "Could not successfully read parameters from file: " + fileParameters.value(), e);
  }
}

@Test
//@FileParameters(value = "/home/tomek/book/github/put_2/src/test/resources/com/practicalunittesting/chp06/excel/financial_junitparams.csv", mapper= CsvWithHeaderMapper.class)
@FileParameters(value = "classpath:com/practicalunittesting/chp06/excel/financial_junitparams.csv", mapper= CsvWithHeaderMapper.class)
public void shouldCalculateDiscount(String value, String discount) {
  assertEquals(Double.parseDouble(discount),
      DiscountCalculator.calculateDiscount(Double.parseDouble(value)), 0.0001);
}

  @Test
  //@FileParameters(value = "/home/tomek/book/github/put_2/src/test/resources/com/practicalunittesting/chp06/excel/financial_junitparams.csv", mapper= CsvWithHeaderMapper.class)
  @FileParameters(value = "classpath:com/practicalunittesting/chp06/excel/financial_junitparams.csv", mapper= CsvWithHeaderMapper.class)
  public void shouldCalculateDiscountDoubles(double value, double discount) {
    assertEquals(discount,
        DiscountCalculator.calculateDiscount(value), 0.0001);
  }
}