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JUnit-DataProviders

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This project exercises following data providers with JUnitParams Junit plugin and core Junit 4+ Parameterized test runner class:

The providers can be integrated with Junit 5 tests via adapter (see below).

Unlike core Data Providers in Junit (5?) and TestNg this provider class allows flexible uniform data file path modification at runtime through environment setting which is useful e.g. for enabling one to exercize different test configurations for DEV / TEST / UAT environments without modifying or recompiling the test suite java code. The technical details in Extra Features section below.

Usage with JUnitParams

ROWNUMSEARCHCOUNT
1junit100
2testng30

or a JSON file with the following structure:

[{
    "keyword": "junit",
    "count": 101.0
  }, {
    "keyword": "testng",
    "count": 31.0
  }]

or

{
  "some test": [{
    "keyword": "junit",
    "count": 101.0
  }, {
    "keyword": "testng",
    "count": 31.0
  }],
  "another test": [{
    "parameter": "value",

  }],
}

@Test
@ExcelParameters(filepath = "classpath:data_2007.xlsx", sheetName = "", type = "Excel 2007")
public void loadParamsFromEmbeddedExcel2007(double rowNum, String keyword, double count) {
  // test code, e.g. confirm the parameters are passed
	assumeTrue("search", keyword.matches("(?:junit|testng|spock)"));
	assertThat((int) count).isGreaterThan(0);
}

or

@Test
@ExcelParameters(filepath = "file:src/test/resources/data_2003.xls", sheetName = "", type = "Excel 2003")
public void loadParamsFromFileExcel2003(double rownum, String keyword, double count) {
  // test code, e.g. confirm the parameters are passed
	assumeTrue("search", keyword.matches("(?:junit|testng|spock)"));
	assertThat((int) count).isGreaterThan(0);
}

or

@Test
@ExcelParameters(filepath = "file:${USERPROFILE}/Desktop/data.ods", sheetName = "", type = "OpenOffice Spreadsheet")
public void loadParamsFromFileOpenOfficeSpreadsheel(double rowNum,
    String keyword, double count) {
  // test code, e.g. confirm the parameters are passed
  assumeTrue("search", keyword.matches("(?:junit|testng|spock)"));
  assertThat((int) count).isGreaterThan(0);
}

or

	private final String jsonDataPath = "file:c:/ProgramData/Temp/data.json";
	@Test
	@FileParameters(value = jsonDataPath, mapper = JSONMapper.class)
	public void loadParamsFromJSONFile(String strCount,
			String strKeyword) {
    // actual test code
		dataTest(strCount, strKeyword);
	}

or

	private final static String testDataPath = "file:c:/Users/${env:USERNAME}/Documents/data.ods";
	@Test
	@ExcelParameters(filepath = testDataPath, sheetName = "", type = "OpenOffice Spreadsheet", debug = true)
	public void loadParamsFromFileOpenOfficeSpreadsheetUsingVariable(
			double rowNum, String keyword, double count) {
		dataTest(keyword, count);
	}

The ExcelParametersProvider-annotated class will read all columns from the Excel 2007, Excel 2003 or Open Office spreadhsheet from the file system using relative (to the project directory) or absolute path when filepath is defined with a file: prefix . The known system environment settings are being interpolated: file:c:/Users/${env:USERNAME}/Documents/data.json file:${USERPROFILE} for Excel and Opend Office but not yet for the JSON mapper (work in progress)

When test data file is placed outside the project directory, it is often desired to have it in Desktop, Downloads or some other directory of the current user.

The environment variables being OS specific and annotation spec enforcing that every annotation parameter is a constant expressions makes it a little bit challenging, preventing one from using class variables or static methods - e.g. code like below: @Test @ExcelParameters(filepath = String.format( "file:${USERPROFILE}%sDesktop%sdata.ods", File.separator), sheetName = "", type = "Spreadsheet", debug = true)

will fail with

The value for annotation attribute ExcelParameters.filepath must be a constant expression


Therefore __JUnit-DataProviders__ internally converts
between `${USERPRFILE}` and `${HOME}` eliminating the need to tweak the path expressions
like `filepath = "file:${USERPROFILE}/Desktop/data.ods"` or `filepath = "file:${HOMEDIR}/Desktop/data.ods" - both would work across OS.


or from inside the jar when `filepath` is defined with a `classpath:` prefix and executes the test for every row of data.
The test developer is responsible for matching the test method argument types and the column data types.

Setting the `debug` flag with `@ExcelParameters` attribute would enable debug messages during the data loading:
```java
@Test
@ExcelParameters(filepath = "classpath:data_2007.xlsx", sheetName = "", type = "Excel 2007", debug = true)
public void loadParamsFromEmbeddedExcel2007(double rowNum, String keyword,
    double count) {
  dataTest(keyword, count);
}

this will show the following:

0 = A ID
1 = B SEARCH
2 = C COUNT
Skipped the header
Cell Value: "1.0" class java.lang.Double
Cell Value: "junit" class java.lang.String
Cell Value: "104.0" class java.lang.Double
...
Loaded 3 rows
row 0 : [1.0, junit, 104.0]
...

NOTE: attributes for column selection and forcing every column type to primitive String type are work in progress.

Maven Central

The snapshot versions are deployed to https://oss.sonatype.org/content/repositories/snapshots/com/github/sergueik/junitparams/junit_params/ Release versions status: pending.

To use the snapshot version, add the following to pom.xml:

<dependency>
  <groupId>com.github.sergueik.junitparams</groupId>
  <artifactId>junit_dataproviders</artifactId>
  <version>0.0.15-SNAPSHOT</version>
</dependency>

<repositories>
  <repository>
    <id>ossrh</id>
    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
  </repository>
</repositories>

or, for earlier versions of the jar,

<dependency>
  <groupId>com.github.sergueik.junitparams</groupId>
  <artifactId>junit_params</artifactId>
  <version>0.0.15-SNAPSHOT</version>
</dependency>

<repositories>
  <repository>
    <id>ossrh</id>
    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
  </repository>
</repositories>

Extra Features for JUnitParams Junit plugin

This data provider overcomes the known difficulty of core TestNG or Junit parameter annotations: developer is not allowed to redefine the dataprovider attributes like in particular the data source path:

public static final String dataPath = "file:src/test/resources/data.json";
  @Test
  @ExcelParameters(filepath = dataPath)
  public void test( double rowNum, String keyword, double count) {
   // actual code ot the  test
  }

In the above, one is only allowed to initialize the testDataPath to a String(or int) primitive type, in particular, one can not set it differently for Jenkins / Travis automated build environment and IDE like below:


private static final String jsonDataPath = (env.containsKey("TRAVIS")
    && env.get("TRAVIS").equals("true")) ?
    ? "file:src/test/resources/data.json"
    : "file:c:/ProgramData/Temp/data.json";
@Test
@FileParameters(value = jsonDataPath, mapper = JSONMapper.class)
public void loadParamsFromJSONFile(String strCount, String strKeyword) {
  dataTest(strCount, strKeyword);
}

or

private static final boolean isCIBuild = (env.containsKey("TRAVIS")
    && env.get("TRAVIS").equals("true")) ? true : false;

@Test
@ExcelParameters(filepath = isCIBuild ? "file:src/test/resources/data.ods"
    : "file:${USERPROFILE}/Desktop/data.ods", sheetName = "", type = "OpenOffice Spreadsheet", debug = true)
public void loadParamsFromFileOpenOfficeSpreadsheet(double rowNum,
    String keyword, double count) {
  dataTest(keyword, count);
}

would fail to compile:

Compilation failure: The value for annotation attribute must be a constant expression

Even declaring the same (pseudo-const) data as a static final String in a separate class:

public class ParamData {
  public final static String dataPath = "file:src/test/resources/data.json";
}

and assigning the result to the variable in the main test class,

public class FileParamsTest {

  private final static String dataPath = ParamData.dataPath;

will lead the the same error convinsincg one it likely not doable. This limitation is not observed with the core Junit Parameterized test runner class. Porting all data file kinds to use with this provideris a work in progress, currently only the JSON provider is converted.

However it is quite easy to implement this functionality in the data provider class ExcelParametersProvider itself by adding an extra class variable named e.g. testEnvironment that would receive its value from e.g. the environment variable named TEST_ENVIRONMENT and, when non-blank, would override the data file paths which were specified through the file:// protocol prefix and which therefore referred to the system file paths (not to data embedded inside the jar): After this is done the original test data provider annotation

  @Test
  @ExcelParameters(filepath = "file:src/test/resources/data.xlsx")
  public void test(double rowNum, String keyword, double count) {
    try {
    dataTest(keyword, count);
    } catch (IllegalStateException e) {
    System.err
    .println(String.format("keyword: %s , cound : %d ", keyword, count));
    }
  }

combined with environment TEST_ENVIRONMENT set to e.g. dev will make dataprovider read the test data from src/test/resources/dev/data.xlsx rather then src/test/resources/data.xlsx.

It is implemented directly in the ExcelParametersProvider provider in a very basic fashion as shown below:

public class ExcelParametersProvider implements ParametersProvider<ExcelParameters> {

  private final static String testEnvironment = (System.getenv("TEST_ENVIRONMENT") != null) ? System.getenv("TEST_ENVIRONMENT") : "";

and

  public void initialize(ExcelParameters parametersAnnotation, FrameworkMethod frameworkMethod) {
    filepath = parametersAnnotation.filepath();
    type = parametersAnnotation.type();
    sheetName = parametersAnnotation.sheetName();
    protocol = filepath.substring(0, filepath.indexOf(':'));
    filename = filepath.substring(filepath.indexOf(':') + 1);
    debug = parametersAnnotation.debug();
    if (testEnvironment != null && testEnvironment != "") {
      if (protocol.matches("file")) {
        if (debug) {
          System.err.println(String.format("Amending the %s with %s", filename,
              testEnvironment));
        }
      }
      // Inject the directory into the file path
      String updatedFilename = filename.replaceAll("^(.*)/([^/]+)$", String.format("$1/%s/$2", testEnvironment));
      filename = updatedFilename;
    }
    // ... rest of initialization
  }

Running the test in debug mode

copy src\test\resources\data.* src\test\resources\dev\
set  TEST_ENVIRONMENT=dev
mvn test

works just as expected - in the example the processing of the Open Office data file data.ods and Excel 2003 data file data_2003.xls driven tests is shown:

Amending the src/test/resources/data.ods with dev => src/test/resources/dev/data.ods
Reading Open Office Spreadsheet: Employee Data

export TEST_ENVIRONMENT=test
mkdir -p src/test/resources/$TEST_ENVIRONMENT
cp src/test/resources/data* src/test/resources/$TEST_ENVIRONMENT
mvn test
Amending the src/test/resources/data_2003.xls with test => src/test/resources/test/data_2003.xls
createDataFromExcel2003: Reading Excel 2003 sheet: Employee Data

One can easily tweak this behavior further: e.g. turn the name TEST_ENVIRONMENT of the key envirnment variable into a separate parameter or define environment specifics via property file (this is work in progress). Similar changes are available for testNg-DataProviders.

Usage with JUnit Parameterized runnner

.

Instance Constructor and Class propetry injection annotations for test parameterization are basically supported by Junit 4 onward via an org.junit.runners.Parameterized class. However the core JUnit wiki does not mention storing test data in external data file which is entirely possible with core JUnit Parameterized tests:

instead of hard coding the data in the test class

@RunWith(Parameterized.class)
public class StraightParameterizedConstructorTest extends DataTest {

	@Parameters
	public static Collection<Object[]> data() {
		return Arrays.asList(new Object[][] { { 1.0, "junit", 204 }});
	}

	private double rowNum;
	private String keyword;
	private int count;

	// constructor injection
	public StraightParameterizedConstructorTest(double rowNum, String keyword, int count) {
		this.rowNum = rowNum;
		this.keyword = keyword;
		this.count = count;
	}

one can define a singleton class based on one of the classes currently available in com.github.sergueik.junitparams:

public class DataSource {

	private static DataSource instance = new DataSource();

	private DataSource() {
	}

	public static DataSource getInstance() {
		return instance;
	}

	// De-serialize the rowset of String data parameters from the JSON file from
	// the provided path property
	// for later become injected in the test via @Parameters collection
	public Collection<Object[]> getdata() {

		try {
			// temporarily store a replica of code from JSONMapper class
			return Arrays.asList(createDataFromJSON());
		} catch (JSONException e) {
			if (debug) {
				System.err.println("Failed to load data from datafile: " + dataFile);
			}
			return new ArrayList<Object[]>();
		}
	}

	public Object[][] createDataFromJSON {
  // read and parse JSON
  }
	public Object[][] createDataFromYAML {
  // read and parse YAML
  }

and then set the instance of DataSource class within the Test class with path to the data, optionally with other paratemetes like column selection:

@RunWith(Parameterized.class)
public class DataProviderClassParameterizedPropertiesInjectionTest extends DataTest {

	private static DataSource dataSource = DataSource.getInstance();
	private static String dataFile = "src/test/resources/data.json";

	@Parameters
	public static Collection<Object[]> data() {
		dataSource.setDataFile(dataFile);
		return dataSource.getdata();
	}

  private String rowNum;
	private String keyword;
	private String count;

	public DataProviderClassParameterizedConstructorTest(String rowNum,
			String keyword, String count) {
		this.rowNum = rowNum;
		this.keyword = keyword;
		this.count = count;
	}

	@Test
	public void parameterizedTest() {
		try {
			dataTest(count, keyword);
		} catch (IllegalStateException e) {
			System.err
					.println(String.format("keyword: %s , count : %d ", keyword, count));
		}
	}

The only downside is that, at least with JSON and YAML data files, the only supported @parameter data type is the String primitive type.

The other minor known issue when loading from JSON the column order is not fully predictable and so is better be enforced through an extra property (that is work in progress, addressed already for YAML).

Note

This project and the testNg-DataProviders - have large code overlap for processing spreadsheets, evolve in parallel and only differ in low level test methdod annotation details.

Note: the JUnitParams project seems to have been dormant for quite some time, but the PR is in the works.

Apache POI compatibility

Filtering Data Rows for JUnitParams

In addition to using every row of spreadsheet as test parameter one may create a designated column which value would be indicating to use or skip that row of data, like:

ROWNUMSEARCHCOUNTENABLED
1junit1001
2testng301
3spock200
4mockito411

and annotate the method like

@Test
@ExcelParameters(filepath = "file:src/test/resources/filtered_data.ods",
sheetName = "Filtered Employee Data", type = "OpenOffice Spreadsheet",
debug = true, controlColumn = "ENABLED", withValue = "1")
public void loadParamsFilteredByColumn(
    double rowNum, String keyword, double count) {
  dataTest(keyword, count);
}

with this data setting only rows 1,2 and 4 from the data extract above would be used as loadParamsFilteredByColumn test method parameters. The control column itself is not passed to the subject test method. Currently this functionality is implemented for OpenOffice spreadsheet only, in the junit data provider. Remaining format and testng provider data filtering is a work in progress. This feature of storing more then one set of tests in one spreadsheet and picking the ones which column is set to a specified value has been inspired by some python post and the [forum (in Russian)(http://software-testing.ru/forum/index.php?/topic/37870-kastomizatciia-parametrizatcii-v-pytest/).

Junit 5 Adapter

To use the Excel and other data providers with Jnit5 @ParameterizedTest one can embed an adapter into the @MethodSource method (for simlicity the needed arguments made class-level static)


private final static String filepath = "classpath:data2_2007.xlsx";
private final static String sheetName = "";
private final static String type = "Excel 2007";
private final static boolean debug = false;
private final static String controlColumn = "";
private final static String withValue = "";
private static final ExcelParameters parametersAnnotation = new ExcelParameters() {
	@Override
	public String filepath() {
		return filepath;
	}

	@Override
	public Class<? extends Annotation> annotationType() {
		// NOTE: the method needed for the interface is Junit 4 legacy:
		// Returns the annotation type of this annotation.
		return null;
	}

	@Override
	public String sheetName() {
		return sheetName;
	}

	@Override
	public String type() {
		return type;
	}

	@Override
	public boolean loadEmptyColumns() {
		return false;
	}

	@Override
	public boolean debug() {
		return debug;
	}

	@Override
	public String controlColumn() {
		return controlColumn;
	}

	@Override
	public String withValue() {
		return withValue;
	}
};

// adapter
private static Stream<Object> testData() {
	ExcelParametersProvider provider = new ExcelParametersProvider();

	try {
		Class<?> _class = Class.forName("com.github.sergueik.junit5params.CurrentMethodDataTest");
		Method _method = _class.getMethod("dummy", String.class);
		FrameworkMethod _frameworkMedhod = new FrameworkMethod(_method);
		provider.initialize(parametersAnnotation, _frameworkMedhod);
	} catch (ClassNotFoundException | NoSuchMethodException | SecurityException e) {
		System.err.println("Exception (ignored): " + e.getMessage());
		// e.printStackTrace();
	} catch (java.lang.NullPointerException e) {
		// for unsatisfied Excel Parameter properties
		e.printStackTrace();
	}
	Object[] parameters = provider.getParameters();
	if (debug) {
		System.err.println(String.format("Received %d parameters", parameters.length));
	}
	if (debug) {
		for (int cnt = 0; cnt != parameters.length; cnt++) {
			Object[] row = (Object[]) parameters[cnt];
			System.err.println(String.format("parameter # %d: %s", cnt, String.valueOf(row[0])));
		}
	}
	return Stream.of(parameters);

}

NOTE: the frameworkMethod argument in initialize seems to be a legacy

static public void dummy(String data) {

}

then inject paramers as usual:

@ParameterizedTest
@MethodSource("testData")
public void test(Object param) {
	// TODO: debug being called
	assertThat(param, notNullValue());
	System.err.println("Parameter: " + param.toString());
}

This will produce:

Parameter: junit
Parameter: testng
Parameter: spock

NOTE: for this test only, leave just ine column of data in Excel file. Converion of multi parameter annotations is a work in proggess.

Work in Progress

See Also

Author

Serguei Kouzmine