JUnit 5

Parameterised Tests

• A tutorial - https://blog.codefx.org/libraries/junit-5-parameterized-tests/.

• Some examples from Excel library,

  static List<ExcelWriter> getTestWorkbookWriters() {
      val streaming = testWriter().isStreaming(true).build();
      val nonStreaming = testWriter().isStreaming(false).build();
  
      return Arrays.asList(streaming, nonStreaming);
  }
  
  @ParameterizedTest
  @MethodSource("getTestWorkbookWriters")
  void testSimpleWritesOfOscars(ExcelWriter writer) {
      val sheetWriter = writer.getRowDataWriter("Oscars");
  
      sheetWriter.writeRow(Arrays.asList("Name", "Year", "Movie"));
      sheetWriter.writeRow(Arrays.asList("Warner Baxter", 1929, "In Old Arizona"));
  
      ExcelSheetWriter sw = (ExcelSheetWriter) sheetWriter;
      val sheet = sw.getSheet();
      assertEquals(5, sheet.getLastRowNum() + 1); // number of rows = last row num (zero based) + 1
  }

• TODO: To test exceptions

JUnit parameterised tests still feel quite constrained compared to flexible ScalaTest etc. Thus for a big Java project, it might be worth looking at Groovy based Spock framework for testing.