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Runtime problems in TestNG asserts



2019 Community Moderator ElectionHow do you assert that a certain exception is thrown in JUnit 4 tests?differences between 2 JUnit Assert classesHow do I use Assert to verify that an exception has been thrown?Best practice for Python assertWhat is the “assert” function?What does the Java assert keyword do, and when should it be used?What is the use of “assert” in Python?PHPUnit assert that an exception was thrown?What is “assert” in JavaScript?Asserting in testng using containing










0















I have a TestNG assertion which may occasionally fail due to the state of the object asserted (ArrayList element), and when it does, I would like to display this state.



I created an example which will fail in runtime, to illustrate the concept



import static org.testng.Assert.assertEquals;



@Test
public void sandbox()
ArrayList<Integer> arr = new ArrayList<>();
assertEquals(arr.size(), 0, "The problem is: " + arr.get(0).toString());



I expected the assertion to pass and it will, when I remove the third argument (message). I see it's not a TestNG issue as execution is not stepping in the statement, but rather fails directly at this step with



at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)


What's the best approach here? I am thinking of a method which will take care of the exception, but perhaps there are better known ways.



Thanks










share|improve this question






















  • You created empty array and then trying to access element at index 0. Clearly its going to throw error.

    – IfOnly
    31 mins ago











  • Yes, but I don't expect this statement to be evaluated at all because the assertion is supposed to be passed anyway in this case. (the argument is the message on failed asserts only). In real life situation this array is normally empty, but sometimes is not and when it's not, I would like to log the content.

    – Eugene A
    27 mins ago
















0















I have a TestNG assertion which may occasionally fail due to the state of the object asserted (ArrayList element), and when it does, I would like to display this state.



I created an example which will fail in runtime, to illustrate the concept



import static org.testng.Assert.assertEquals;



@Test
public void sandbox()
ArrayList<Integer> arr = new ArrayList<>();
assertEquals(arr.size(), 0, "The problem is: " + arr.get(0).toString());



I expected the assertion to pass and it will, when I remove the third argument (message). I see it's not a TestNG issue as execution is not stepping in the statement, but rather fails directly at this step with



at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)


What's the best approach here? I am thinking of a method which will take care of the exception, but perhaps there are better known ways.



Thanks










share|improve this question






















  • You created empty array and then trying to access element at index 0. Clearly its going to throw error.

    – IfOnly
    31 mins ago











  • Yes, but I don't expect this statement to be evaluated at all because the assertion is supposed to be passed anyway in this case. (the argument is the message on failed asserts only). In real life situation this array is normally empty, but sometimes is not and when it's not, I would like to log the content.

    – Eugene A
    27 mins ago














0












0








0








I have a TestNG assertion which may occasionally fail due to the state of the object asserted (ArrayList element), and when it does, I would like to display this state.



I created an example which will fail in runtime, to illustrate the concept



import static org.testng.Assert.assertEquals;



@Test
public void sandbox()
ArrayList<Integer> arr = new ArrayList<>();
assertEquals(arr.size(), 0, "The problem is: " + arr.get(0).toString());



I expected the assertion to pass and it will, when I remove the third argument (message). I see it's not a TestNG issue as execution is not stepping in the statement, but rather fails directly at this step with



at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)


What's the best approach here? I am thinking of a method which will take care of the exception, but perhaps there are better known ways.



Thanks










share|improve this question














I have a TestNG assertion which may occasionally fail due to the state of the object asserted (ArrayList element), and when it does, I would like to display this state.



I created an example which will fail in runtime, to illustrate the concept



import static org.testng.Assert.assertEquals;



@Test
public void sandbox()
ArrayList<Integer> arr = new ArrayList<>();
assertEquals(arr.size(), 0, "The problem is: " + arr.get(0).toString());



I expected the assertion to pass and it will, when I remove the third argument (message). I see it's not a TestNG issue as execution is not stepping in the statement, but rather fails directly at this step with



at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)


What's the best approach here? I am thinking of a method which will take care of the exception, but perhaps there are better known ways.



Thanks







java arrays testng assert






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 35 mins ago









Eugene AEugene A

224212




224212












  • You created empty array and then trying to access element at index 0. Clearly its going to throw error.

    – IfOnly
    31 mins ago











  • Yes, but I don't expect this statement to be evaluated at all because the assertion is supposed to be passed anyway in this case. (the argument is the message on failed asserts only). In real life situation this array is normally empty, but sometimes is not and when it's not, I would like to log the content.

    – Eugene A
    27 mins ago


















  • You created empty array and then trying to access element at index 0. Clearly its going to throw error.

    – IfOnly
    31 mins ago











  • Yes, but I don't expect this statement to be evaluated at all because the assertion is supposed to be passed anyway in this case. (the argument is the message on failed asserts only). In real life situation this array is normally empty, but sometimes is not and when it's not, I would like to log the content.

    – Eugene A
    27 mins ago

















You created empty array and then trying to access element at index 0. Clearly its going to throw error.

– IfOnly
31 mins ago





You created empty array and then trying to access element at index 0. Clearly its going to throw error.

– IfOnly
31 mins ago













Yes, but I don't expect this statement to be evaluated at all because the assertion is supposed to be passed anyway in this case. (the argument is the message on failed asserts only). In real life situation this array is normally empty, but sometimes is not and when it's not, I would like to log the content.

– Eugene A
27 mins ago






Yes, but I don't expect this statement to be evaluated at all because the assertion is supposed to be passed anyway in this case. (the argument is the message on failed asserts only). In real life situation this array is normally empty, but sometimes is not and when it's not, I would like to log the content.

– Eugene A
27 mins ago













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