enum example

[rajat]

Is there an example of how enums work in DDTUnit?

This is what the cookbook says (Defining Constant Objects):

<test id="mySecondTestCase">

<objs>

<obj id="myObj"
type="junitx.ddtunit.resources.MyEnumerator"

hint="constant">FIRST_ENUMERATOR</obj>

</objs>

</test>

where the object identified by obj@id="myObj" reflects a Java object
definition like in the next example

public enum MyEnumerator {

FIRST_ENUMERATION, SECOND_ENUMERATION, NULL

}

How should the constant myObj be referenced in another object?

For example, given the following class:

class Test {

private MyEnumerator enumerator;

public void setEnumerator(MyEnumerator enumerator) {

this.enumerator= enumerator;

}

}

if there is an object of type Test as follows:

<obj id="myTest" type="Test" hint="call"
method="setEnumerator">

<item type="MyEnumerator">myObj</item>

</obj>

... this does not seem to work. I have tried several other combinations,
including trying to associate via a refid, but none seem to work.

[Dale Campbell]

Hi Rajat,

See this example for how to create an enumerated type inside the XML file:

http://ddtunit.svn.sourceforge.net/viewvc/ddtunit/trunk/src/test/resources/ju
nitx/ddtunit/functest/DDT-ProcessConstantValuesTest.xml?view=markup

Look around line 100.

Is this what you were trying see?

dale

[Joerg Gellien]

Hi Rajat,

there are different concerns mixed in your request.

I'll try to claryfy these.

First of all if you want to instanciate an object there are different options.

1) instanciate by default constructor and set fields

a) by reflection => setting fields directly (no setter methods used)

<obj id="firstObject" type="MyType">

<firstField type="FirstFieldType">my value</firstField>

<secondField type= ...

...

</obj>

b) by setters using Java Bean Standard

<obj id="secondObj" type="MyType"
hint="bean">

<firstField type="FirstFieldType">my value</obj>

....

This will first instanciate an object of type MyType and then uses setter
methods to set therequested fields.

=> definition above is equivalent to

MyType secondObj = new MyType();

secondObj.setFirstField("my value");

...

2) instanciate by selected constructor. This will only provide fields that are
filled during execution of selected constructor.

<obj id="thirdObj" type="MyType" hint="call"
method="constructor">

<item type="FirstFieldType">my value</item>

...

3) call a method from a specified class to instanciate objects.

This feature was introduced to support static factory classes in the first
place. This feature was never intended to provide complex method invocation
calls. This should be done in the test class.

Hopefully this makes things a little bit clearer.

Any ideas on fixing and clarifying documentation are highly welcome.

If you need more assistance just ask.

Best regards

Jörg

[Joerg Gellien]

Hi Rajat,

just updated the tests.

If you use the link as provided by Dale you will find an example that should
reflect your request.

Best regards

Jörg

[rajat]

Hi Jorg,

I had a follow up question on this. (By the way, I was able to get the enum
example to work - thanks a lot.)

In the example that you provided, if we had:

MyType secondObj = new MyType("typeName");

secondObj.setFirstField(myValue);

How would the XML for this look like? That is, is it possible to combine the
constructor and bean methods in XML? I could not find an example

of this in the cookbook.

Thanks,

Rajat

[Joerg Gellien]

Hi Rajat,

great to hear the example worked.

Because DDTUnit xml dialect is not a full fledged language it is not possible
to define your example completly in a DDTunit data spec.

It is possible to start with a default constructor and fill up fields of an
object by using it's setters or use a constructor with all required field
arguments as parameters.

It is possible to use a static method of a class to provide the content for a
field, e.g. using a factory call.

In your example I would check which part requires changes from testcase to
testcase and would try to initialize this inside of the xml while the static
part could be instanciated inside of the testmethod.

Hope this helps.

More ideas and examples on usage are very welcome.

Best regards

Jörg