public List<TestGroupType> getTestGroup() {
        if (testGroup == null) {
            testGroup = new ArrayList<>();
        }
        return this.testGroup;
    }
Gets the value of the testGroup property.

<p>
This accessor method returns a reference to the live list,
not a snapshot. Therefore any modification you make to the
returned list will be present inside the JAXB object.
This is why there is not a <CODE>set</CODE> method for the testGroup property.

<p>
For example, to add a new item, do as follows:
<pre>
   getTestGroup().add(newItem);
</pre>


<p>
Objects of the following type(s) are allowed in the list
{@link TestGroupType }
test/common/src/main/java/io/apiman/test/common/plan/TestPlan.java