Related
I want to execute test methods which are annotated by #Test in specific order.
For example:
public class MyTest {
#Test public void test1(){}
#Test public void test2(){}
}
I want to ensure to run test1() before test2() each time I run MyTest, but I couldn't find annotation like #Test(order=xx).
I think it's quite important feature for JUnit, if author of JUnit doesn't want the order feature, why?
I think it's quite important feature for JUnit, if author of JUnit doesn't want the order feature, why?
I'm not sure there is a clean way to do this with JUnit, to my knowledge JUnit assumes that all tests can be performed in an arbitrary order. From the FAQ:
How do I use a test fixture?
(...) The ordering of test-method invocations is not guaranteed, so testOneItemCollection() might be executed before testEmptyCollection(). (...)
Why is it so? Well, I believe that making tests order dependent is a practice that the authors don't want to promote. Tests should be independent, they shouldn't be coupled and violating this will make things harder to maintain, will break the ability to run tests individually (obviously), etc.
That being said, if you really want to go in this direction, consider using TestNG since it supports running tests methods in any arbitrary order natively (and things like specifying that methods depends on groups of methods). Cedric Beust explains how to do this in order of execution of tests in testng.
If you get rid of your existing instance of Junit, and download JUnit 4.11 or greater in the build path, the following code will execute the test methods in the order of their names, sorted in ascending order:
import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runners.MethodSorters;
#FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class SampleTest {
#Test
public void testAcreate() {
System.out.println("first");
}
#Test
public void testBupdate() {
System.out.println("second");
}
#Test
public void testCdelete() {
System.out.println("third");
}
}
Migration to TestNG seems the best way, but I see no clear solution here for jUnit. Here is most readable solution / formatting I found for jUnit:
#FixMethodOrder( MethodSorters.NAME_ASCENDING ) // force name ordering
public class SampleTest {
#Test
void stage1_prepareAndTest(){};
#Test
void stage2_checkSomething(){};
#Test
void stage2_checkSomethingElse(){};
#Test
void stage3_thisDependsOnStage2(){};
#Test
void callTimeDoesntMatter(){}
}
This ensures stage2 methods are called after stage1 ones and before stage3 ones.
P.S. I feel this approach is better that jUnit 5.5 #Order annotation because it provides better notation for reader.
If the order is important, you should make the order yourself.
#Test public void test1() { ... }
#Test public void test2() { test1(); ... }
In particular, you should list some or all possible order permutations to test, if necessary.
For example,
void test1();
void test2();
void test3();
#Test
public void testOrder1() { test1(); test3(); }
#Test(expected = Exception.class)
public void testOrder2() { test2(); test3(); test1(); }
#Test(expected = NullPointerException.class)
public void testOrder3() { test3(); test1(); test2(); }
Or, a full test of all permutations:
#Test
public void testAllOrders() {
for (Object[] sample: permute(1, 2, 3)) {
for (Object index: sample) {
switch (((Integer) index).intValue()) {
case 1: test1(); break;
case 2: test2(); break;
case 3: test3(); break;
}
}
}
}
Here, permute() is a simple function which iterates all possible permuations into a Collection of array.
JUnit since 5.5 allows #TestMethodOrder(OrderAnnotation.class) on class and #Order(1) on test-methods.
JUnit old versions allow test methods run ordering using class annotations:
#FixMethodOrder(MethodSorters.NAME_ASCENDING)
#FixMethodOrder(MethodSorters.JVM)
#FixMethodOrder(MethodSorters.DEFAULT)
By default test methods are run in alphabetical order. So, to set specific methods order you can name them like:
a_TestWorkUnit_WithCertainState_ShouldDoSomething
b_TestWorkUnit_WithCertainState_ShouldDoSomething
c_TestWorkUnit_WithCertainState_ShouldDoSomething
Or
_1_TestWorkUnit_WithCertainState_ShouldDoSomething
_2_TestWorkUnit_WithCertainState_ShouldDoSomething
_3_TestWorkUnit_WithCertainState_ShouldDoSomething
You can find examples here.
Its one of the main issue which I faced when I worked on Junit and I came up with following solution which works fine for me:
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
public class OrderedRunner extends BlockJUnit4ClassRunner {
public OrderedRunner(Class<?> clazz) throws InitializationError {
super(clazz);
}
#Override
protected List<FrameworkMethod> computeTestMethods() {
List<FrameworkMethod> list = super.computeTestMethods();
List<FrameworkMethod> copy = new ArrayList<FrameworkMethod>(list);
Collections.sort(copy, new Comparator<FrameworkMethod>() {
#Override
public int compare(FrameworkMethod f1, FrameworkMethod f2) {
Order o1 = f1.getAnnotation(Order.class);
Order o2 = f2.getAnnotation(Order.class);
if (o1 == null || o2 == null) {
return -1;
}
return o1.order() - o2.order();
}
});
return copy;
}
}
also create a interface like below:
#Retention(RetentionPolicy.RUNTIME)
#Target({ ElementType.METHOD})
public #interface Order {
public int order();
}
Now suppose you have class A where you have written several test cases like below:
(#runWith=OrderRunner.class)
Class A{
#Test
#Order(order = 1)
void method(){
//do something
}
}
So execution will start from method named "method()".
Thanks!
JUnit 5 update (and my opinion)
I think it's quite important feature for JUnit, if author of JUnit doesn't want the order feature, why?
By default, unit testing libraries don't try to execute tests in the order that occurs in the source file.
JUnit 5 as JUnit 4 work in that way. Why? Because if the order matters it means that some tests are coupled between them and that is undesirable for unit tests.
So the #Nested feature introduced by JUnit 5 follows the same default approach.
But for integration tests, the order of the test method may matter since a test method may change the state of the application in a way expected by another test method.
For example when you write an integration test for a e-shop checkout processing, the first test method to be executed is registering a client, the second is adding items in the basket and the last one is doing the checkout. If the test runner doesn't respect that order, the test scenario is flawed and will fail.
So in JUnit 5 (from the 5.4 version) you have all the same the possibility to set the execution order by annotating the test class with #TestMethodOrder(OrderAnnotation.class) and by specifying the order with #Order(numericOrderValue) for the methods which the order matters.
For example :
#TestMethodOrder(OrderAnnotation.class)
class FooTest {
#Order(3)
#Test
void checkoutOrder() {
System.out.println("checkoutOrder");
}
#Order(2)
#Test
void addItemsInBasket() {
System.out.println("addItemsInBasket");
}
#Order(1)
#Test
void createUserAndLogin() {
System.out.println("createUserAndLogin");
}
}
Output :
createUserAndLogin
addItemsInBasket
checkoutOrder
By the way, specifying #TestMethodOrder(OrderAnnotation.class) looks like not needed (at least in the 5.4.0 version I tested).
Side note
About the question: is JUnit 5 the best choice to write integration tests? I don't think that it should be the first tool to consider (Cucumber and co may often bring more specific value and features for integration tests) but in some integration test cases, the JUnit framework is enough. So that is a good news that the feature exists.
The (as yet unreleased) change https://github.com/junit-team/junit/pull/386 introduces a #SortMethodsWith. https://github.com/junit-team/junit/pull/293 at least made the order predictable without that (in Java 7 it can be quite random).
Look at a JUnit report. JUnit is already organized by package. Each package has (or can have) TestSuite classes, each of which in turn run multiple TestCases. Each TestCase can have multiple test methods of the form public void test*(), each of which will actually become an instance of the TestCase class to which they belong. Each test method (TestCase instance) has a name and a pass/fail criteria.
What my management requires is the concept of individual TestStep items, each of which reports their own pass/fail criteria. Failure of any test step must not prevent the execution of subsequent test steps.
In the past, test developers in my position organized TestCase classes into packages that correspond to the part(s) of the product under test, created a TestCase class for each test, and made each test method a separate "step" in the test, complete with its own pass/fail criteria in the JUnit output. Each TestCase is a standalone "test", but the individual methods, or test "steps" within the TestCase, must occur in a specific order.
The TestCase methods were the steps of the TestCase, and test designers got a separate pass/fail criterion per test step. Now the test steps are jumbled, and the tests (of course) fail.
For example:
Class testStateChanges extends TestCase
public void testCreateObjectPlacesTheObjectInStateA()
public void testTransitionToStateBAndValidateStateB()
public void testTransitionToStateCAndValidateStateC()
public void testTryToDeleteObjectinStateCAndValidateObjectStillExists()
public void testTransitionToStateAAndValidateStateA()
public void testDeleteObjectInStateAAndObjectDoesNotExist()
public void cleanupIfAnythingWentWrong()
Each test method asserts and reports its own separate pass/fail criteria.
Collapsing this into "one big test method" for the sake of ordering loses the pass/fail criteria granularity of each "step" in the JUnit summary report. ...and that upsets my managers. They are currently demanding another alternative.
Can anyone explain how a JUnit with scrambled test method ordering would support separate pass/fail criteria of each sequential test step, as exemplified above and required by my management?
Regardless of the documentation, I see this as a serious regression in the JUnit framework that is making life difficult for lots of test developers.
Not sure I agree, If I want to test 'File Upload' and then test 'Data Inserted by File Upload' why would I not want these to be independent from each other? Perfectly reasonable I think to be able to run them separately rather than having both in a Goliath test case.
What you want is perfectly reasonable when test cases are being run as a suite.
Unfortunately no time to give a complete solution right now, but have a look at class:
org.junit.runners.Suite
Which allows you to call test cases (from any test class) in a specific order.
These might be used to create functional, integration or system tests.
This leaves your unit tests as they are without specific order (as recommended), whether you run them like that or not, and then re-use the tests as part of a bigger picture.
We re-use/inherit the same code for unit, integration and system tests, sometimes data driven, sometimes commit driven, and sometimes run as a suite.
JUnit 4 update
As of JUnit 4.13 #OrderWith, it is possible to reproduce the JUnit 5 #Order annotation. This solution better integrates with JUnit 4 than #RunWith a custom BlockJUnit4ClassRunner implementation.
Here's how I could replace method name ordering (#FixMethodOrder(MethodSorters.NAME_ASCENDING)) with an ordering by annotation.
#OrderWith(OrderAnnotation.class)
public class MyTest {
#Test
#Order(-1)
public void runBeforeNotAnnotatedTests() {}
#Test
public void notAnnotatedTestHasPriority0() {}
#Test
#Order(1)
public void thisTestHasPriority1() {}
#Test
#Order(2)
public void thisTestHasPriority2() {}
}
/**
* JUnit 4 equivalent of JUnit 5's {#code org.junit.jupiter.api.Order}
*/
#Retention(RetentionPolicy.RUNTIME)
#Target({ ElementType.METHOD })
public #interface Order {
/**
* Default order value for elements not explicitly annotated with {#code #Order}.
*
* #see Order#value
*/
int DEFAULT = 0;
/**
* The order value for the annotated element.
* <p>Elements are ordered based on priority where a lower value has greater
* priority than a higher value. For example, {#link Integer#MAX_VALUE} has
* the lowest priority.
*
* #see #DEFAULT
*/
int value();
}
import org.junit.runner.Description;
import org.junit.runner.manipulation.Ordering;
import org.junit.runner.manipulation.Sorter;
/**
* Order test methods by their {#link Order} annotation. The lower value has the highest priority.
* The tests that are not annotated get the default value {#link Order#DEFAULT}.
*/
public class OrderAnnotation extends Sorter implements Ordering.Factory {
public OrderAnnotation() {
super(COMPARATOR);
}
#Override
public Ordering create(Context context) {
return this;
}
private static final Comparator<Description> COMPARATOR = Comparator.comparingInt(
description -> Optional.ofNullable(description.getAnnotation(Order.class))
.map(Order::value)
.orElse(Order.DEFAULT));
}
The not annotated tests get a default priority of 0. The order of tests with the same priority is undetermined.
Gist: https://gist.github.com/jcarsique/df98e0bad9e88e8258c4ab34dad3c863
Inspired by:
Aman Goel's answer
Test execution order Wiki by JUnit team
JUnit 5 source code
See my solution here:
"Junit and java 7."
In this article I describe how to run junit tests in order - "just as in your source code".
Tests will be run, in order as your test methods appears in class file.
http://intellijava.blogspot.com/2012/05/junit-and-java-7.html
But as Pascal Thivent said, this is not a good practise.
As others have stated, tests should be ideally be independent of execution order. This makes tests less fragile, and allows them to be run independently (many IDEs allow you to select a test method and execute it independently of other tests).
That being said, for integration tests, some people prefer to rely on method ordering.
Starting with JUnit 4.13 you can define your own class to reorder tests by extending Ordering. See the JUnit wiki for more details. Here's an example using the built-in Alphanumeric class to order the tests alphanumerically using the test method name:
import org.junit.Test;
import org.junit.runner.OrderWith;
import org.junit.runner.manipulation.Alphanumeric;
#OrderWith(Alphanumeric.class)
public class TestMethodOrder {
#Test
public void testA() {
System.out.println("first");
}
#Test
public void testB() {
System.out.println("second");
}
#Test
public void testC() {
System.out.println("third");
}
}
For JUnit 4, putting this annotation on the test class solved the problem.
#FixMethodOrder(MethodSorters.JVM)
With JUnit 5.4, you can specify the order :
#Test
#Order(2)
public void sendEmailTestGmail() throws MessagingException {
you just need to annotate your class
#TestMethodOrder(OrderAnnotation.class)
https://junit.org/junit5/docs/current/user-guide/#writing-tests-test-execution-order
i'm using this in my project and it works very well !
You can use one of these piece of codes:
#FixMethodOrder(MethodSorters.JVM) OR #FixMethodOrder(MethodSorters.DEFAULT) OR #FixMethodOrder(MethodSorters.NAME_ASCENDING)
Before your test class like this:
#FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class BookTest {...}
It's time to move to Junit5.
Here is a sample of what we could get:
#TestMethodOrder(MethodOrderer.OrderAnnotation.class)
class OrderedTests {
#Test
#Order(1)
void nullValues() {}
#Test
#Order(2)
void emptyValues() {}
#Test
#Order(3)
void validValues() {}
}
For Junit4, copy the logic that you have in several tests in one test method.
I've read a few answers and agree its not best practice, but the easiest way to order your tests - and the way that JUnit runs tests by default is by alphabetic name ascending.
So just name your tests in the alphabetic order that you want. Also note the test name must begin
with the word test. Just watch out for numbers
test12 will run before test2
so:
testA_MyFirstTest
testC_ThirdTest
testB_ATestThatRunsSecond
Please check out this one: https://github.com/TransparentMarket/junit. It runs the test in the order they are specified (defined within the compiled class file). Also it features a AllTests suite to run tests defined by sub package first. Using the AllTests implementation one can extend the solution in also filtering for properties (we used to use #Fast annotations but those were not published yet).
Here is an extension to JUnit that can produce the desired behavior: https://github.com/aafuks/aaf-junit
I know that this is against the authors of JUnit philosophy, but when using JUnit in environments that are not strict unit testing (as practiced in Java) this can be very helpful.
I ended up here thinking that my tests weren't run in order, but the truth is that the mess was in my async jobs. When working with concurrency you need to perform concurrency checks between your tests as well.
In my case, jobs and tests share a semaphore, so next tests hang until the running job releases the lock.
I know this is not fully related to this question, but maybe could help targeting the correct issue
If you want to run test methods in a specific order in JUnit 5, you can use the below code.
#TestMethodOrder(MethodOrderer.OrderAnnotation.class)
public class MyClassTest {
#Test
#Order(1)
public void test1() {}
#Test
#Order(2)
public void test2() {}
}
I have the following test class:
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInstance;
import static org.junit.jupiter.api.Assertions.assertTrue;
public class HierarchicalTest {
#Test
void checkOuter() {
assertTrue(false);
}
#Nested
#TestInstance(TestInstance.Lifecycle.PER_CLASS)
class PrepBTest {
#Test
void checkInnerA() {}
#Test
void checkInnerB() {}
}
}
I want to have the behavior that checkInnerA() and checkInnerB() won't be executed when checkOuter() fails.
On the other side checkInnerB() should be executed when checkInnerA() fails because it is on the same level.
Is there a simple soulution (e.g. with JUnit 5 extension) to achieve this behavior?
In my opinion that's often the behavior which is wished.
UPDATE:
As of JUnit Jupiter 5.4, you can develop an extension that implements the TestWatcher and ExecutionCondition APIs to achieve this behavior.
In the testFailed() method from the TestWatcher API you need to track test classes that have failures, and you need to store this information in the root ExtensionContext.Store.
In the evaluateExecutionCondition() method from the ExecutionCondition API you need to determine if the current class is a #Nested test class (i.e., an inner class) and check if the enclosing test class had failures. If that holds true, you need to disable the current #Nested test class and otherwise enable it.
Those are the general guidelines. For a working example, please see the SkipOnFailuresInEnclosingClassExtension I just posted to my junit5-demo repository on GitHub. That example goes one step further by only skipping #Nested test classes if they are also annotated with #SkipOnFailuresInEnclosingClass. The OuterTests class shows the annotation and extension in action.
No, as of JUnit Jupiter 5.3, there is currently no way to achieve that with out-of-the-box solutions.
You could potentially write a custom extension that tracks the success of tests in an enclosing test class -- for example, by implementing TestExecutionExceptionHandler. That would need to be stored in the ExtensionContext.Store. The extension would then need to implement ExecutionCondition to programmatically disable nested test classes.
It's unfortunately not very straightforward to track the "success" of previously executed tests currently, but that should improve with the introduction of the new TestWatcher extension API that is currently slated for inclusion in the upcoming JUnit Jupiter 5.4: https://github.com/junit-team/junit5/issues/542
I found a strange thing and I'm interested to know why it happens. I'm using maven surefire plugin ( 2.12.4 ) with Junit 4.11. When I wanted to use #Category annotation in order to disable some tests. the strange thing that it works correctly only with tests that don't extend TestCase. For test that don't extend TestCase I was able to put the annotation only on the test method to run/disable, but with others it disables all tests in the class.
Example:
Command Line:
mvn test -Dgroups=!testgroups.DisabledTests run only test B for the first snippet:
import static org.junit.Assert.*;
public class DataTest {
#Test
public void testA(){...}
#Test #Category(testgroups.DisabledTests.class)
public void testB(){...}
}
for the second case with class extending TestCase, it will run no tests.
public class DataTest extends TestCase {
#Test
public void testA(){...}
#Test #Category(testgroups.DisabledTests.class)
public void testB(){...}
}
Why it happens?
The solution was given in a comment by deborah-digges:
The problem is that the second class is an extension of TestCase. Since this is JUnit 3 style, the annotation #Category didn't work. Annotating the class with #RunWith(JUnit4.class) should give you the same result in both cases
and another by Stefan Birkner:
JUnit 4 finds test by looking for the #Test annotation. You can remove the extends TestCase from your test class. Furthermore the name of the test method does no longer have to start with test. You're free to choose any method name you want.
We have recently upgraded on Java 7, but after that our suite is facing weird issue that it is first executing method with #After annotation and then methods with #Test annotation.
Any help will appreciated.
Thanks in advance
EDIT: This is the code from the comment:
public class TestClasse extends TestCase {
#Test public void testLogin(){ System.out.println("TestCase1"); }
#Test public void testLogout(){ System.out.println("TestCase2"); }
#After public void testGenerateReport(){ System.out.println("testCase3") }
}
This is your code:
public class TestClasse extends TestCase {
#Test public void testLogin(){ System.out.println("TestCase1"); }
#Test public void testLogout(){ System.out.println("TestCase2"); }
#After public void testGenerateReport(){ System.out.println("testCase3") }
}
You are using JUnit 3 (because you're extending TestCase), so JUnit is running all of the methods which begin with 'test'.
The solution: don't extend TestCase, and make sure that your classpath includes JUnit 4 (4.11 is the latest). Also, to avoid confusion, don't name your #After methods testXXX.
Why did it stop working when you upgraded to Java 7?
When you are searching for methods in Java 6 and before, in most cases the JVM returns the methods in the order in which they are declared in the source file (in your case testLogin, testLogout, testGenerateReport). This changed with Java 7, so that the methods are returned in a different unpredictable order (see my answer to Has JUnit4 begun supporting ordering of test? Is it intentional?). So, when you upgraded to Java 7, the order in which the methods were found and executed changed - and your #After was executed first.
For more background to this issue, see Sort test methods for predictability and SortMethodsWith allows the user to choose the order of execution of the methods within a test class.
I want to execute test methods which are annotated by #Test in specific order.
For example:
public class MyTest {
#Test public void test1(){}
#Test public void test2(){}
}
I want to ensure to run test1() before test2() each time I run MyTest, but I couldn't find annotation like #Test(order=xx).
I think it's quite important feature for JUnit, if author of JUnit doesn't want the order feature, why?
I think it's quite important feature for JUnit, if author of JUnit doesn't want the order feature, why?
I'm not sure there is a clean way to do this with JUnit, to my knowledge JUnit assumes that all tests can be performed in an arbitrary order. From the FAQ:
How do I use a test fixture?
(...) The ordering of test-method invocations is not guaranteed, so testOneItemCollection() might be executed before testEmptyCollection(). (...)
Why is it so? Well, I believe that making tests order dependent is a practice that the authors don't want to promote. Tests should be independent, they shouldn't be coupled and violating this will make things harder to maintain, will break the ability to run tests individually (obviously), etc.
That being said, if you really want to go in this direction, consider using TestNG since it supports running tests methods in any arbitrary order natively (and things like specifying that methods depends on groups of methods). Cedric Beust explains how to do this in order of execution of tests in testng.
If you get rid of your existing instance of Junit, and download JUnit 4.11 or greater in the build path, the following code will execute the test methods in the order of their names, sorted in ascending order:
import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runners.MethodSorters;
#FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class SampleTest {
#Test
public void testAcreate() {
System.out.println("first");
}
#Test
public void testBupdate() {
System.out.println("second");
}
#Test
public void testCdelete() {
System.out.println("third");
}
}
Migration to TestNG seems the best way, but I see no clear solution here for jUnit. Here is most readable solution / formatting I found for jUnit:
#FixMethodOrder( MethodSorters.NAME_ASCENDING ) // force name ordering
public class SampleTest {
#Test
void stage1_prepareAndTest(){};
#Test
void stage2_checkSomething(){};
#Test
void stage2_checkSomethingElse(){};
#Test
void stage3_thisDependsOnStage2(){};
#Test
void callTimeDoesntMatter(){}
}
This ensures stage2 methods are called after stage1 ones and before stage3 ones.
P.S. I feel this approach is better that jUnit 5.5 #Order annotation because it provides better notation for reader.
If the order is important, you should make the order yourself.
#Test public void test1() { ... }
#Test public void test2() { test1(); ... }
In particular, you should list some or all possible order permutations to test, if necessary.
For example,
void test1();
void test2();
void test3();
#Test
public void testOrder1() { test1(); test3(); }
#Test(expected = Exception.class)
public void testOrder2() { test2(); test3(); test1(); }
#Test(expected = NullPointerException.class)
public void testOrder3() { test3(); test1(); test2(); }
Or, a full test of all permutations:
#Test
public void testAllOrders() {
for (Object[] sample: permute(1, 2, 3)) {
for (Object index: sample) {
switch (((Integer) index).intValue()) {
case 1: test1(); break;
case 2: test2(); break;
case 3: test3(); break;
}
}
}
}
Here, permute() is a simple function which iterates all possible permuations into a Collection of array.
JUnit since 5.5 allows #TestMethodOrder(OrderAnnotation.class) on class and #Order(1) on test-methods.
JUnit old versions allow test methods run ordering using class annotations:
#FixMethodOrder(MethodSorters.NAME_ASCENDING)
#FixMethodOrder(MethodSorters.JVM)
#FixMethodOrder(MethodSorters.DEFAULT)
By default test methods are run in alphabetical order. So, to set specific methods order you can name them like:
a_TestWorkUnit_WithCertainState_ShouldDoSomething
b_TestWorkUnit_WithCertainState_ShouldDoSomething
c_TestWorkUnit_WithCertainState_ShouldDoSomething
Or
_1_TestWorkUnit_WithCertainState_ShouldDoSomething
_2_TestWorkUnit_WithCertainState_ShouldDoSomething
_3_TestWorkUnit_WithCertainState_ShouldDoSomething
You can find examples here.
Its one of the main issue which I faced when I worked on Junit and I came up with following solution which works fine for me:
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
public class OrderedRunner extends BlockJUnit4ClassRunner {
public OrderedRunner(Class<?> clazz) throws InitializationError {
super(clazz);
}
#Override
protected List<FrameworkMethod> computeTestMethods() {
List<FrameworkMethod> list = super.computeTestMethods();
List<FrameworkMethod> copy = new ArrayList<FrameworkMethod>(list);
Collections.sort(copy, new Comparator<FrameworkMethod>() {
#Override
public int compare(FrameworkMethod f1, FrameworkMethod f2) {
Order o1 = f1.getAnnotation(Order.class);
Order o2 = f2.getAnnotation(Order.class);
if (o1 == null || o2 == null) {
return -1;
}
return o1.order() - o2.order();
}
});
return copy;
}
}
also create a interface like below:
#Retention(RetentionPolicy.RUNTIME)
#Target({ ElementType.METHOD})
public #interface Order {
public int order();
}
Now suppose you have class A where you have written several test cases like below:
(#runWith=OrderRunner.class)
Class A{
#Test
#Order(order = 1)
void method(){
//do something
}
}
So execution will start from method named "method()".
Thanks!
JUnit 5 update (and my opinion)
I think it's quite important feature for JUnit, if author of JUnit doesn't want the order feature, why?
By default, unit testing libraries don't try to execute tests in the order that occurs in the source file.
JUnit 5 as JUnit 4 work in that way. Why? Because if the order matters it means that some tests are coupled between them and that is undesirable for unit tests.
So the #Nested feature introduced by JUnit 5 follows the same default approach.
But for integration tests, the order of the test method may matter since a test method may change the state of the application in a way expected by another test method.
For example when you write an integration test for a e-shop checkout processing, the first test method to be executed is registering a client, the second is adding items in the basket and the last one is doing the checkout. If the test runner doesn't respect that order, the test scenario is flawed and will fail.
So in JUnit 5 (from the 5.4 version) you have all the same the possibility to set the execution order by annotating the test class with #TestMethodOrder(OrderAnnotation.class) and by specifying the order with #Order(numericOrderValue) for the methods which the order matters.
For example :
#TestMethodOrder(OrderAnnotation.class)
class FooTest {
#Order(3)
#Test
void checkoutOrder() {
System.out.println("checkoutOrder");
}
#Order(2)
#Test
void addItemsInBasket() {
System.out.println("addItemsInBasket");
}
#Order(1)
#Test
void createUserAndLogin() {
System.out.println("createUserAndLogin");
}
}
Output :
createUserAndLogin
addItemsInBasket
checkoutOrder
By the way, specifying #TestMethodOrder(OrderAnnotation.class) looks like not needed (at least in the 5.4.0 version I tested).
Side note
About the question: is JUnit 5 the best choice to write integration tests? I don't think that it should be the first tool to consider (Cucumber and co may often bring more specific value and features for integration tests) but in some integration test cases, the JUnit framework is enough. So that is a good news that the feature exists.
The (as yet unreleased) change https://github.com/junit-team/junit/pull/386 introduces a #SortMethodsWith. https://github.com/junit-team/junit/pull/293 at least made the order predictable without that (in Java 7 it can be quite random).
Look at a JUnit report. JUnit is already organized by package. Each package has (or can have) TestSuite classes, each of which in turn run multiple TestCases. Each TestCase can have multiple test methods of the form public void test*(), each of which will actually become an instance of the TestCase class to which they belong. Each test method (TestCase instance) has a name and a pass/fail criteria.
What my management requires is the concept of individual TestStep items, each of which reports their own pass/fail criteria. Failure of any test step must not prevent the execution of subsequent test steps.
In the past, test developers in my position organized TestCase classes into packages that correspond to the part(s) of the product under test, created a TestCase class for each test, and made each test method a separate "step" in the test, complete with its own pass/fail criteria in the JUnit output. Each TestCase is a standalone "test", but the individual methods, or test "steps" within the TestCase, must occur in a specific order.
The TestCase methods were the steps of the TestCase, and test designers got a separate pass/fail criterion per test step. Now the test steps are jumbled, and the tests (of course) fail.
For example:
Class testStateChanges extends TestCase
public void testCreateObjectPlacesTheObjectInStateA()
public void testTransitionToStateBAndValidateStateB()
public void testTransitionToStateCAndValidateStateC()
public void testTryToDeleteObjectinStateCAndValidateObjectStillExists()
public void testTransitionToStateAAndValidateStateA()
public void testDeleteObjectInStateAAndObjectDoesNotExist()
public void cleanupIfAnythingWentWrong()
Each test method asserts and reports its own separate pass/fail criteria.
Collapsing this into "one big test method" for the sake of ordering loses the pass/fail criteria granularity of each "step" in the JUnit summary report. ...and that upsets my managers. They are currently demanding another alternative.
Can anyone explain how a JUnit with scrambled test method ordering would support separate pass/fail criteria of each sequential test step, as exemplified above and required by my management?
Regardless of the documentation, I see this as a serious regression in the JUnit framework that is making life difficult for lots of test developers.
Not sure I agree, If I want to test 'File Upload' and then test 'Data Inserted by File Upload' why would I not want these to be independent from each other? Perfectly reasonable I think to be able to run them separately rather than having both in a Goliath test case.
What you want is perfectly reasonable when test cases are being run as a suite.
Unfortunately no time to give a complete solution right now, but have a look at class:
org.junit.runners.Suite
Which allows you to call test cases (from any test class) in a specific order.
These might be used to create functional, integration or system tests.
This leaves your unit tests as they are without specific order (as recommended), whether you run them like that or not, and then re-use the tests as part of a bigger picture.
We re-use/inherit the same code for unit, integration and system tests, sometimes data driven, sometimes commit driven, and sometimes run as a suite.
JUnit 4 update
As of JUnit 4.13 #OrderWith, it is possible to reproduce the JUnit 5 #Order annotation. This solution better integrates with JUnit 4 than #RunWith a custom BlockJUnit4ClassRunner implementation.
Here's how I could replace method name ordering (#FixMethodOrder(MethodSorters.NAME_ASCENDING)) with an ordering by annotation.
#OrderWith(OrderAnnotation.class)
public class MyTest {
#Test
#Order(-1)
public void runBeforeNotAnnotatedTests() {}
#Test
public void notAnnotatedTestHasPriority0() {}
#Test
#Order(1)
public void thisTestHasPriority1() {}
#Test
#Order(2)
public void thisTestHasPriority2() {}
}
/**
* JUnit 4 equivalent of JUnit 5's {#code org.junit.jupiter.api.Order}
*/
#Retention(RetentionPolicy.RUNTIME)
#Target({ ElementType.METHOD })
public #interface Order {
/**
* Default order value for elements not explicitly annotated with {#code #Order}.
*
* #see Order#value
*/
int DEFAULT = 0;
/**
* The order value for the annotated element.
* <p>Elements are ordered based on priority where a lower value has greater
* priority than a higher value. For example, {#link Integer#MAX_VALUE} has
* the lowest priority.
*
* #see #DEFAULT
*/
int value();
}
import org.junit.runner.Description;
import org.junit.runner.manipulation.Ordering;
import org.junit.runner.manipulation.Sorter;
/**
* Order test methods by their {#link Order} annotation. The lower value has the highest priority.
* The tests that are not annotated get the default value {#link Order#DEFAULT}.
*/
public class OrderAnnotation extends Sorter implements Ordering.Factory {
public OrderAnnotation() {
super(COMPARATOR);
}
#Override
public Ordering create(Context context) {
return this;
}
private static final Comparator<Description> COMPARATOR = Comparator.comparingInt(
description -> Optional.ofNullable(description.getAnnotation(Order.class))
.map(Order::value)
.orElse(Order.DEFAULT));
}
The not annotated tests get a default priority of 0. The order of tests with the same priority is undetermined.
Gist: https://gist.github.com/jcarsique/df98e0bad9e88e8258c4ab34dad3c863
Inspired by:
Aman Goel's answer
Test execution order Wiki by JUnit team
JUnit 5 source code
See my solution here:
"Junit and java 7."
In this article I describe how to run junit tests in order - "just as in your source code".
Tests will be run, in order as your test methods appears in class file.
http://intellijava.blogspot.com/2012/05/junit-and-java-7.html
But as Pascal Thivent said, this is not a good practise.
As others have stated, tests should be ideally be independent of execution order. This makes tests less fragile, and allows them to be run independently (many IDEs allow you to select a test method and execute it independently of other tests).
That being said, for integration tests, some people prefer to rely on method ordering.
Starting with JUnit 4.13 you can define your own class to reorder tests by extending Ordering. See the JUnit wiki for more details. Here's an example using the built-in Alphanumeric class to order the tests alphanumerically using the test method name:
import org.junit.Test;
import org.junit.runner.OrderWith;
import org.junit.runner.manipulation.Alphanumeric;
#OrderWith(Alphanumeric.class)
public class TestMethodOrder {
#Test
public void testA() {
System.out.println("first");
}
#Test
public void testB() {
System.out.println("second");
}
#Test
public void testC() {
System.out.println("third");
}
}
For JUnit 4, putting this annotation on the test class solved the problem.
#FixMethodOrder(MethodSorters.JVM)
With JUnit 5.4, you can specify the order :
#Test
#Order(2)
public void sendEmailTestGmail() throws MessagingException {
you just need to annotate your class
#TestMethodOrder(OrderAnnotation.class)
https://junit.org/junit5/docs/current/user-guide/#writing-tests-test-execution-order
i'm using this in my project and it works very well !
You can use one of these piece of codes:
#FixMethodOrder(MethodSorters.JVM) OR #FixMethodOrder(MethodSorters.DEFAULT) OR #FixMethodOrder(MethodSorters.NAME_ASCENDING)
Before your test class like this:
#FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class BookTest {...}
It's time to move to Junit5.
Here is a sample of what we could get:
#TestMethodOrder(MethodOrderer.OrderAnnotation.class)
class OrderedTests {
#Test
#Order(1)
void nullValues() {}
#Test
#Order(2)
void emptyValues() {}
#Test
#Order(3)
void validValues() {}
}
For Junit4, copy the logic that you have in several tests in one test method.
I've read a few answers and agree its not best practice, but the easiest way to order your tests - and the way that JUnit runs tests by default is by alphabetic name ascending.
So just name your tests in the alphabetic order that you want. Also note the test name must begin
with the word test. Just watch out for numbers
test12 will run before test2
so:
testA_MyFirstTest
testC_ThirdTest
testB_ATestThatRunsSecond
Please check out this one: https://github.com/TransparentMarket/junit. It runs the test in the order they are specified (defined within the compiled class file). Also it features a AllTests suite to run tests defined by sub package first. Using the AllTests implementation one can extend the solution in also filtering for properties (we used to use #Fast annotations but those were not published yet).
Here is an extension to JUnit that can produce the desired behavior: https://github.com/aafuks/aaf-junit
I know that this is against the authors of JUnit philosophy, but when using JUnit in environments that are not strict unit testing (as practiced in Java) this can be very helpful.
I ended up here thinking that my tests weren't run in order, but the truth is that the mess was in my async jobs. When working with concurrency you need to perform concurrency checks between your tests as well.
In my case, jobs and tests share a semaphore, so next tests hang until the running job releases the lock.
I know this is not fully related to this question, but maybe could help targeting the correct issue
If you want to run test methods in a specific order in JUnit 5, you can use the below code.
#TestMethodOrder(MethodOrderer.OrderAnnotation.class)
public class MyClassTest {
#Test
#Order(1)
public void test1() {}
#Test
#Order(2)
public void test2() {}
}