Priority in TestNG with multiple classes

I'm facing with the following problem: I created two classes which include @Tests with priority attribute:

@Test( priority = 1 )
public void testA1() {
    System.out.println("testA1");
}

@Test( priority = 2 )
public void testA2() {
    System.out.println("testA2");
}

@Test( priority = 3 )
public void testA3() {
    System.out.println("testA3");
}

... and ...

@Test( priority = 1 )
public void testB1() {
    System.out.println("testB1");
}

@Test( priority = 2 )
public void testB2() {
    System.out.println("testB2");
}

@Test( priority = 3 )
public void testB3() {
    System.out.println("testB3");
}

I put both classes under one test in testng.xml but when I run the test, it will order my @Tests based on the priorities from both classes:

testA1
testB1
testA2
testB2
testA3
testB3

I'm expecting the following result:

testA1
testA2
testA3
testB1
testB2
testB3

My question is that how can I prevent to order my @Tests based on both classes and run @Tests only from one class at the same time?

In your suite xml use group-by-instances="true"

Sample, where TestClass1 and TestClass2 has the same content as yours

<suite thread-count="2" verbose="10" name="testSuite" parallel="tests">
<test verbose="2" name="MytestCase" group-by-instances="true">
    <classes>
        <class name="com.crazytests.dataproviderissue.TestClass1" />
        <class name="com.crazytests.dataproviderissue.TestClass2" />
    </classes>
</test>
</suite>

I get the output

testA1

testA2

testA3

testB1

testB2

testB3

The most correct way is to use dependsOnMethods. Priority levels are global for test (don't mix with test-methods which are annotated with @Test). In other words: when testng runs test (from <test> tag) it groups methods by priorities and then run it. In your case both testA1 and testB1 have priority=1, so will be executed at the beginning.

You can just provide @Test(testName="test1") / @Test(testName="test2") at the top of each class, and the priorities will be automatically grouped per class. Of course you keep the existing annotations.

Priority in TestNG with multiple classes

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