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  • How to unit test synchronized code

    - by gillJ
    Hi, I am new to Java and junit. I have the following peice of code that I want to test. Would appreciate if you could send your ideas about what's the best way to go about testing it. Basically, the following code is about electing a leader form a Cluster. The leader holds a lock on the shared cache and services of the leader get resumed and disposed if it somehow looses the lock on the cache. How can i make sure that a leader/thread still holds the lock on the cache and that another thread cannot get its services resumed while the first is in execution? public interface ContinuousService { public void resume(); public void pause(); } public abstract class ClusterServiceManager { private volatile boolean leader = false; private volatile boolean electable = true; private List<ContinuousService> services; protected synchronized void onElected() { if (!leader) { for (ContinuousService service : services) { service.resume(); } leader = true; } } protected synchronized void onDeposed() { if (leader) { for (ContinuousService service : services) { service.pause(); } leader = false; } } public void setServices(List<ContinuousService> services) { this.services = services; } @ManagedAttribute public boolean isElectable() { return electable; } @ManagedAttribute public boolean isLeader() { return leader; } public class TangosolLeaderElector extends ClusterServiceManager implements Runnable { private static final Logger log = LoggerFactory.getLogger(TangosolLeaderElector.class); private String election; private long electionWaitTime= 5000L; private NamedCache cache; public void start() { log.info("Starting LeaderElector ({})",election); Thread t = new Thread(this, "LeaderElector ("+election+")"); t.setDaemon(true); t.start(); } public void run() { // Give the connection a chance to start itself up try { Thread.sleep(1000); } catch (InterruptedException e) {} boolean wasElectable = !isElectable(); while (true) { if (isElectable()) { if (!wasElectable) { log.info("Leadership requested on election: {}",election); wasElectable = isElectable(); } boolean elected = false; try { // Try and get the lock on the LeaderElectorCache for the current election if (!cache.lock(election, electionWaitTime)) { // We didn't get the lock. cycle round again. // This code to ensure we check the electable flag every now & then continue; } elected = true; log.info("Leadership taken on election: {}",election); onElected(); // Wait here until the services fail in some way. while (true) { try { Thread.sleep(electionWaitTime); } catch (InterruptedException e) {} if (!cache.lock(election, 0)) { log.warn("Cache lock no longer held for election: {}", election); break; } else if (!isElectable()) { log.warn("Node is no longer electable for election: {}", election); break; } // We're fine - loop round and go back to sleep. } } catch (Exception e) { if (log.isErrorEnabled()) { log.error("Leadership election " + election + " failed (try bfmq logs for details)", e); } } finally { if (elected) { cache.unlock(election); log.info("Leadership resigned on election: {}",election); onDeposed(); } // On deposition, do not try and get re-elected for at least the standard wait time. try { Thread.sleep(electionWaitTime); } catch (InterruptedException e) {} } } else { // Not electable - wait a bit and check again. if (wasElectable) { log.info("Leadership NOT requested on election ({}) - node not electable",election); wasElectable = isElectable(); } try { Thread.sleep(electionWaitTime); } catch (InterruptedException e) {} } } } public void setElection(String election) { this.election = election; } @ManagedAttribute public String getElection() { return election; } public void setNamedCache(NamedCache nc) { this.cache = nc; }

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  • Framework or tool for "distributed unit testing"?

    - by user262646
    Is there any tool or framework able to make it easier to test distributed software written in Java? My system under test is a peer-to-peer software, and I'd like to perform testing using something like PNUnit, but with Java instead of .Net. The system under test is a framework I'm developing to build P2P applications. It uses JXTA as a lower subsystem, trying to hide some complexities of it. It's currently an academic project, so I'm pursuing simplicity at this moment. In my test, I want to demonstrate that a peer (running in its own process, possibly with multiple threads) can discover another one (running in another process or even another machine) and that they can exchange a few messages. I'm not using mocks nor stubs because I need to see both sides working simultaneously. I realize that some kind of coordination mechanism is needed, and PNUnit seems to be able to do that. I've bumped into some initiatives like Pisces, which "aims to provide a distributed testing environment that extends JUnit, giving the developer/tester an ability to run remote JUnits and create complex test suites that are composed of several remote JUnit tests running in parallel or serially", but this project and a few others I have found seem to be long dead.

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  • Unit Testing - Algorithm or Sample based ?

    - by ohadsc
    Say I'm trying to test a simple Set class public IntSet : IEnumerable<int> { Add(int i) {...} //IEnumerable implementation... } And suppose I'm trying to test that no duplicate values can exist in the set. My first option is to insert some sample data into the set, and test for duplicates using my knowledge of the data I used, for example: //OPTION 1 void InsertDuplicateValues_OnlyOneInstancePerValueShouldBeInTheSet() { var set = new IntSet(); //3 will be added 3 times var values = new List<int> {1, 2, 3, 3, 3, 4, 5}; foreach (int i in values) set.Add(i); //I know 3 is the only candidate to appear multiple times int counter = 0; foreach (int i in set) if (i == 3) counter++; Assert.AreEqual(1, counter); } My second option is to test for my condition generically: //OPTION 2 void InsertDuplicateValues_OnlyOneInstancePerValueShouldBeInTheSet() { var set = new IntSet(); //The following could even be a list of random numbers with a duplicate var values = new List<int> { 1, 2, 3, 3, 3, 4, 5}; foreach (int i in values) set.Add(i); //I am not using my prior knowledge of the sample data //the following line would work for any data CollectionAssert.AreEquivalent(new HashSet<int>(values), set); } Of course, in this example, I conveniently have a set implementation to check against, as well as code to compare collections (CollectionAssert). But what if I didn't have either ? This is the situation when you are testing your real life custom business logic. Granted, testing for expected conditions generically covers more cases - but it becomes very similar to implementing the logic again (which is both tedious and useless - you can't use the same code to check itself!). Basically I'm asking whether my tests should look like "insert 1, 2, 3 then check something about 3" or "insert 1, 2, 3 and check for something in general" EDIT - To help me understand, please state in your answer if you prefer OPTION 1 or OPTION 2 (or neither, or that it depends on the case, etc )

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  • Perfom python unit tests via a web interface

    - by 47
    Is it possible to perform unittest tests via a web interface...and if so how? EDIT: For now I want the results...for the tests I want them to be automated...possibly every time I make a change to the code. Sorry I forgot to make this more clear

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  • Can Django flush its database(s) between every unit test

    - by mikem
    Django (1.2 beta) will reset the database(s) between every test that runs, meaning each test runs on an empty DB. However, the database(s) are not flushed. One of the effects of flushing the database is the auto_increment counters are reset. Consider a test which pulls data out of the database by primary key: class ChangeLogTest(django.test.TestCase): def test_one(self): do_something_which_creates_two_log_entries() log = LogEntry.objects.get(id=1) assert_log_entry_correct(log) log = LogEntry.objects.get(id=2) assert_log_entry_correct(log) This will pass because only two log entries were ever created. However, if another test is added to ChangeLogTest and it happens to run before test_one, the primary keys of the log entries are no longer 1 and 2, they might be 2 and 3. Now test_one fails. This is actually a two part question: Is it possible to force ./manage.py test to flush the database between each test case? Since Django doesn't flush the DB between each test by default, maybe there is a good reason. Does anyone know?

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  • Visual studio 2008 unit test keeps failing

    - by Gerbrand
    I've create a method that calculates the harmonic mean based on a list of doubles. But when I'm running the test it keeps failing even thou the output result are the same. My harmonic mean method: public static double GetHarmonicMean(List<double> parameters) { var cumReciprocal = 0.0d; var countN = parameters.Count; foreach( var param in parameters) { cumReciprocal += 1.0d/param; } return 1.0d/(cumReciprocal/countN); } My test method: [TestMethod()] public void GetHarmonicMeanTest() { var parameters = new List<double> { 1.5d, 2.3d, 2.9d, 1.9d, 5.6d }; const double expected = 2.32432293165495; var actual = OwnFunctions.GetHarmonicMean(parameters); Assert.AreEqual(expected, actual); } After running the test the following message is showing: Assert.AreEqual failed. Expected:<2.32432293165495. Actual:<2.32432293165495. For me that are both the same values. Can somebody explain this? Or am I doing something wrong?

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  • Global.asax for Unit Tests?

    - by AngryHacker
    In my MSTest UnitTest project, before running any tests, I need to execute some commands. Is there a feature, kind of like Global.asax is for web based projects, that will let me kick off something before any tests run?

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  • How to write unit tests for an object having multiple properties

    - by jess
    Hi, I have various objects in application,and each has isvalid method to test if values of all properties are set correctly(as per business rules).Now,to test that for each violation isvalid throws false,i will have to write as many tests as rules being checked in isvalid.Is there a simpler way to do this? I am using MBunit.

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  • Any way to separate unit tests from integration tests in VS2008?

    - by AngryHacker
    I have a project full of tests, unit and integration alike. Integration tests require that a pretty large database be present, so it's difficult to make it a part of the build process simply because of the time that it takes to re-initialize the database. Is there a way to somehow separate unit tests from integration tests and have the build server just run the unit tests? I see that there is an Ordered Unit test in VS2008, which allows you to pick and choose tests, but I can't make it just execute alone, without all the others. Is there a trick that I am missing? Or perhaps I could adorn the unit tests with an attribute? What are some of the approaches people are using? P.S. I know I could use mocking for integration tests (just to make them go faster) but then it wouldn't be a true integration test.

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  • apt-get install and update fail

    - by sepehr
    I've got a problem with apt-get update and apt-get install ... commands . every time update or installing fails and errors are : Get:1 http://dl.google.com stable Release.gpg [198B] Ign http://dl.google.com/linux/chrome/deb/ stable/main Translation-en_US Get:2 http://dl.google.com stable Release [1,347B] Get:3 http://dl.google.com stable/main Packages [1,227B] Err http://32.repository.backtrack-linux.org revolution Release.gpg Could not connect to 32.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) Err http://32.repository.backtrack-linux.org/ revolution/main Translation-en_US Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org/ revolution/microverse Translation-en_US Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org/ revolution/non-free Translation-en_US Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org/ revolution/testing Translation-en_US Unable to connect to 32.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org revolution Release.gpg Could not connect to all.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) Err http://all.repository.backtrack-linux.org/ revolution/main Translation-en_US Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org/ revolution/microverse Translation-en_US Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org/ revolution/non-free Translation-en_US Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org/ revolution/testing Translation-en_US Unable to connect to all.repository.backtrack-linux.org:http: Ign http://32.repository.backtrack-linux.org revolution Release Ign http://all.repository.backtrack-linux.org revolution Release Ign http://32.repository.backtrack-linux.org revolution/main Packages Ign http://all.repository.backtrack-linux.org revolution/main Packages Ign http://32.repository.backtrack-linux.org revolution/microverse Packages Ign http://32.repository.backtrack-linux.org revolution/non-free Packages Ign http://32.repository.backtrack-linux.org revolution/testing Packages Ign http://all.repository.backtrack-linux.org revolution/microverse Packages Ign http://all.repository.backtrack-linux.org revolution/non-free Packages Ign http://all.repository.backtrack-linux.org revolution/testing Packages Ign http://32.repository.backtrack-linux.org revolution/main Packages Ign http://32.repository.backtrack-linux.org revolution/microverse Packages Ign http://32.repository.backtrack-linux.org revolution/non-free Packages Ign http://all.repository.backtrack-linux.org revolution/main Packages Ign http://all.repository.backtrack-linux.org revolution/microverse Packages Ign http://all.repository.backtrack-linux.org revolution/non-free Packages Ign http://all.repository.backtrack-linux.org revolution/testing Packages Err http://all.repository.backtrack-linux.org revolution/main Packages Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org revolution/microverse Packages Unable to connect to all.repository.backtrack-linux.org:http: Ign http://32.repository.backtrack-linux.org revolution/testing Packages Err http://32.repository.backtrack-linux.org revolution/main Packages Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org revolution/microverse Packages Unable to connect to 32.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org revolution/non-free Packages Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org revolution/testing Packages Unable to connect to all.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org revolution/non-free Packages Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org revolution/testing Packages Unable to connect to 32.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org revolution Release.gpg Could not connect to source.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) Err http://source.repository.backtrack-linux.org/ revolution/main Translation-en_US Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org/ revolution/microverse Translation-en_US Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org/ revolution/non-free Translation-en_US Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org/ revolution/testing Translation-en_US Unable to connect to source.repository.backtrack-linux.org:http: Ign http://source.repository.backtrack-linux.org revolution Release Ign http://source.repository.backtrack-linux.org revolution/main Packages Ign http://source.repository.backtrack-linux.org revolution/microverse Packages Ign http://source.repository.backtrack-linux.org revolution/non-free Packages Ign http://source.repository.backtrack-linux.org revolution/testing Packages Ign http://source.repository.backtrack-linux.org revolution/main Packages Ign http://source.repository.backtrack-linux.org revolution/microverse Packages Ign http://source.repository.backtrack-linux.org revolution/non-free Packages Ign http://source.repository.backtrack-linux.org revolution/testing Packages Err http://source.repository.backtrack-linux.org revolution/main Packages Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org revolution/microverse Packages Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org revolution/non-free Packages Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org revolution/testing Packages Unable to connect to source.repository.backtrack-linux.org:http: Fetched 2,772B in 1min 3s (44B/s) W: Failed to fetch http://all.repository.backtrack- \linux.org/dists/revolution/Release.gpg Could not connect to all.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/main/i18n/Translation-en_US.bz2 Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/microverse/i18n/Translation-en_US.bz2 Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/non-free/i18n/Translation-en_US.bz2 Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/testing/i18n/Translation-en_US.bz2 Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/Release.gpg Could not connect to 32.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/main/i18n/Translation-en_US.bz2 Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/microverse/i18n/Translation-en_US.bz2 Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/non-free/i18n/Translation-en_US.bz2 Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/testing/i18n/Translation-en_US.bz2 Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/Release.gpg Could not connect to source.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/main/i18n/Translation-en_US.bz2 Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/microverse/i18n/Translation-en_US.bz2 Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/non-free/i18n/Translation-en_US.bz2 Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/testing/i18n/Translation-en_US.bz2 Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/main/binary-i386/Packages.gz Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/microverse/binary-i386/Packages.gz Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/non-free/binary-i386/Packages.gz Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/main/binary-i386/Packages.gz Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/microverse/binary-i386/Packages.gz Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/non-free/binary-i386/Packages.gz Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/testing/binary-i386/Packages.gz Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/testing/binary-i386/Packages.gz Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/main/binary-i386/Packages.gz Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/microverse/binary-i386/Packages.gz Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/non-free/binary-i386/Packages.gz Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/testing/binary-i386/Packages.gz Unable to connect to source.repository.backtrack-linux.org:http: E: Some index files failed to download, they have been ignored, or old ones used instead. I Don't know how to get out of this ! I want to install RPM and YUM package on my backtrack ! I also searched over internet for answer . in backtrack forums or any other sites or weblogs i could'nt find a good answer ! can anyone help ??

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  • GuestPost: Unit Testing Entity Framework (v1) Dependent Code using TypeMock Isolator

    - by Eric Nelson
    Time for another guest post (check out others in the series), this time bringing together the world of mocking with the world of Entity Framework. A big thanks to Moses for agreeing to do this. Unit Testing Entity Framework Dependent Code using TypeMock Isolator by Muhammad Mosa Introduction Unit testing data access code in my opinion is a challenging thing. Let us consider unit tests and integration tests. In integration tests you are allowed to have environmental dependencies such as a physical database connection to insert, update, delete or retrieve your data. However when performing unit tests it is often much more efficient and productive to remove environmental dependencies. Instead you will need to fake these dependencies. Faking a database (also known as mocking) can be relatively straight forward but the version of Entity Framework released with .Net 3.5 SP1 has a number of implementation specifics which actually makes faking the existence of a database quite difficult. Faking Entity Framework As mentioned earlier, to effectively unit test you will need to fake/simulate Entity Framework calls to the database. There are many free open source mocking frameworks that can help you achieve this but it will require additional effort to overcome & workaround a number of limitations in those frameworks. Examples of these limitations include: Not able to fake calls to non virtual methods Not able to fake sealed classes Not able to fake LINQ to Entities queries (replace database calls with in-memory collection calls) There is a mocking framework which is flexible enough to handle limitations such as those above. The commercially available TypeMock Isolator can do the job for you with less code and ultimately more readable unit tests. I’m going to demonstrate tackling one of those limitations using MoQ as my mocking framework. Then I will tackle the same issue using TypeMock Isolator. Mocking Entity Framework with MoQ One basic need when faking Entity Framework is to fake the ObjectContext. This cannot be done by passing any connection string. You have to pass a correct Entity Framework connection string that specifies CSDL, SSDL and MSL locations along with a provider connection string. Assuming we are going to do that, we’ll explore another limitation. The limitation we are going to face now is related to not being able to fake calls to non-virtual/overridable members with MoQ. I have the following repository method that adds an EntityObject (instance of a Blog entity) to Blogs entity set in an ObjectContext. public override void Add(Blog blog) { if(BlogContext.Blogs.Any(b=>b.Name == blog.Name)) { throw new InvalidOperationException("Blog with same name already exists!"); } BlogContext.AddToBlogs(blog); } The method does a very simple check that the name of the new Blog entity instance doesn’t exist. This is done through the simple LINQ query above. If the blog doesn’t already exist it simply adds it to the current context to be saved when SaveChanges of the ObjectContext instance (e.g. BlogContext) is called. However, if a blog with the same name exits, and exception (InvalideOperationException) will be thrown. Let us now create a unit test for the Add method using MoQ. [TestMethod] [ExpectedException(typeof(InvalidOperationException))] public void Add_Should_Throw_InvalidOperationException_When_Blog_With_Same_Name_Already_Exits() { //(1) We shouldn't depend on configuration when doing unit tests! But, //its a workaround to fake the ObjectContext string connectionString = ConfigurationManager .ConnectionStrings["MyBlogConnString"] .ConnectionString; //(2) Arrange: Fake ObjectContext var fakeContext = new Mock<MyBlogContext>(connectionString); //(3) Next Line will pass, as ObjectContext now can be faked with proper connection string var repo = new BlogRepository(fakeContext.Object); //(4) Create fake ObjectQuery<Blog>. Will be used to substitute MyBlogContext.Blogs property var fakeObjectQuery = new Mock<ObjectQuery<Blog>>("[Blogs]", fakeContext.Object); //(5) Arrange: Set Expectations //Next line will throw an exception by MoQ: //System.ArgumentException: Invalid setup on a non-overridable member fakeContext.SetupGet(c=>c.Blogs).Returns(fakeObjectQuery.Object); fakeObjectQuery.Setup(q => q.Any(b => b.Name == "NewBlog")).Returns(true); //Act repo.Add(new Blog { Name = "NewBlog" }); } This test method is checking to see if the correct exception ([ExpectedException(typeof(InvalidOperationException))]) is thrown when a developer attempts to Add a blog with a name that’s already exists. On (1) a connection string is initialized from configuration file. To retrieve the full connection string. On (2) a fake ObjectContext is being created. The ObjectContext here is MyBlogContext and its being created using this var fakeContext = new Mock<MyBlogContext>(connectionString); This way a fake context is being created using MoQ. On (3) a BlogRepository instance is created. BlogRepository has dependency on generate Entity Framework ObjectContext, MyObjectContext. And so the fake context is passed to the constructor. var repo = new BlogRepository(fakeContext.Object); On (4) a fake instance of ObjectQuery<Blog> is being created to use as a substitute to MyObjectContext.Blogs property as we will see in (5). On (5) setup an expectation for calling Blogs property of MyBlogContext and substitute the return result with the fake ObjectQuery<Blog> instance created on (4). When you run this test it will fail with MoQ throwing an exception because of this line: fakeContext.SetupGet(c=>c.Blogs).Returns(fakeObjectQuery.Object); This happens because the generate property MyBlogContext.Blogs is not virtual/overridable. And assuming it is virtual or you managed to make it virtual it will fail at the following line throwing the same exception: fakeObjectQuery.Setup(q => q.Any(b => b.Name == "NewBlog")).Returns(true); This time the test will fail because the Any extension method is not virtual/overridable. You won’t be able to replace ObjectQuery<Blog> with fake in memory collection to test your LINQ to Entities queries. Now lets see how replacing MoQ with TypeMock Isolator can help. Mocking Entity Framework with TypeMock Isolator The following is the same test method we had above for MoQ but this time implemented using TypeMock Isolator: [TestMethod] [ExpectedException(typeof(InvalidOperationException))] public void Add_New_Blog_That_Already_Exists_Should_Throw_InvalidOperationException() { //(1) Create fake in memory collection of blogs var fakeInMemoryBlogs = new List<Blog> {new Blog {Name = "FakeBlog"}}; //(2) create fake context var fakeContext = Isolate.Fake.Instance<MyBlogContext>(); //(3) Setup expected call to MyBlogContext.Blogs property through the fake context Isolate.WhenCalled(() => fakeContext.Blogs) .WillReturnCollectionValuesOf(fakeInMemoryBlogs.AsQueryable()); //(4) Create new blog with a name that already exits in the fake in memory collection in (1) var blog = new Blog {Name = "FakeBlog"}; //(5) Instantiate instance of BlogRepository (Class under test) var repo = new BlogRepository(fakeContext); //(6) Acting by adding the newly created blog () repo.Add(blog); } When running the above test method it will pass as the Add method of BlogRepository is going to throw an InvalidOperationException which is the expected behaviour. Nothing prevents us from faking out the database interaction! Even faking ObjectContext  at (2) didn’t require a connection string. On (3) Isolator sets up a faking result for MyBlogContext.Blogs when its being called through the fake instance fakeContext created on (2). The faking result is just an in-memory collection declared an initialized on (1). Finally at (6) action we call the Add method of BlogRepository passing a new Blog instance that has a name that’s already exists in the fake in-memory collection which we set up at (1). As expected the test will pass because it will throw the expected exception defined on top of the test method - InvalidOperationException. TypeMock Isolator succeeded in faking Entity Framework with ease. Conclusion We explored how to write a simple unit test using TypeMock Isolator for code which is using Entity Framework. We also explored a few of the limitations of other mocking frameworks which TypeMock is successfully able to handle. There are workarounds that you can use to overcome limitations when using MoQ or Rhino Mock, however the workarounds will require you to write more code and your tests will likely be more complex. For a comparison between different mocking frameworks take a look at this document produced by TypeMock. You might also want to check out this open source project to compare mocking frameworks. I hope you enjoyed this post Muhammad Mosa http://mosesofegypt.net/ http://twitter.com/mosessaur Screencast of unit testing Entity Framework Related Links GuestPost: Introduction to Mocking GuesPost: Typemock Isolator – Much more than an Isolation framework

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  • Bit by bit comparison of using Java or Python for unit testing frameworks and Selenium

    - by Anirudh
    Currently we are in the process of finalizing which language out of Java, Python should be used for Automation using selenium webdriver and a suitable unit testing frameworks. I have made use of Junit, TestNG and webdriver while using with Java and have designed frameworks without much fuss before. I am new to python though I came across pyhton's unit testing frameworks like unittest, pyunit, nose e.t.c but I have doubts if they would be as successful as testNG or Java. I would like to analyze point by point when used with selenium webdriver as below: 1)I have read that as Python is an interpreted language hence it's execution is slower, so say if I have to run 1000 test cases which take about 6 hours to run in Java, would python take considerably longer time for the same test cases like 8 hours? 2)Can the Python unit testing framework be as flexible as a Java unit testing framework like testNG in terms or Grouping the tests, parallel execution, skipping test. e.t.c 3)Also one point that I think of is that Python with selenium webdriver doeasn't have as big or learned community as we have for Java with webdriver, say if I run into trouble with something I am more likely to find an answer for Java as compared to python? 4)Somewhat related to point 3, is it safe to rely on tools, plugins or even webderiver's python's binding as a continuously well maintained? 5)One major drawback as I see while using python's unit testing framework is lack of boilerplate code or libraries for nicely illustrative HTML reports preferably historical reports with Pie charts, bar graphs and timelines as we have in case of Java like Allure, TestNG's default reports, reportNG or Junit reports with the help of ANT as shown below Allure Reports Junit Historical reports Also I would like to emphasize on the fact if there is a way for one to write the framework in java and make libraries or utilities according to out application in webdriver which can easily be called or integrated in with python code or modules? That would actually solve the problem for us as the client would be able to use the code we write in Java and make use of the same or call it from their python modules?

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  • Introducing QuickUnit

    - by RoyOsherove
    A friend of mine, Ariel, just finished up his latest project, in the unit testing world – called QuickUnit. From the site: QuickUnit significantly reduces the time needed to design and generate high-quality unit tests. I see it as an interactive unit test generator with all the options for isolation included. give it a whirl

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  • How do you handle measuring Code Coverage in JavaScript

    - by Dancrumb
    In order to measure Code Coverage for JavaScript unit tests, one needs to instrument the code, run the tests and then perform post-processing. My concern is that, as a result, you are unit testing code that will never be run in production. Since JavaScript isn't compiled, what you test should be precisely what you execute. So here's my question, how do you handle this? One thought I had was to run Unit Testing on the production code and use that for my pass fail. I would then create a shadow of my production code, with instrumentation and run my unit tests again; this would give me my code coverage stats. Has anyone come across a method that is a little more graceful than this?

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  • Unit turning in navmesh-based pathfinding

    - by Haddayn
    I'm working on an RTS game, and I'm using navmeshes for unit pathfinding. I do know how to find a general path within a navmesh, but how do you determine if the unit have enough space to turn? I have units of different shapes (mostly rectangles with different dimensions), and with different turn radii. Additionally some of units can turn in place, and some can move in reverse. So, how to find a path which unit can follow, considering that it can not rotate easily?

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  • Xcode Unit Testing - Accessing Resources from the application's bundle?

    - by Ben Scheirman
    I'm running into an issue and I wanted to confirm that I'm doing things the correct way. I can test simple things with my SenTestingKit tests, and that works okay. I've set up a Unit Test Bundle and set it as a dependency on the main application target. It successfully runs all tests whenever I press cmd+B. Here's where I'm running into issues. I have some XML files that I need to load from the resources folder as part of the application. Being a good unit tester, I want to write unit tests around this to make sure that they are loading properly. So I have some code that looks like this: NSString *filePath = [[NSBundle mainBundle] pathForResource:@"foo" ofType:@"xml"]; This works when the application runs, but during a unit test, mainBundle points to the wrong bundle, so this line of code returns nil. So I changed it up to utilize a known class like this: NSString *filePath = [[NSBundle bundleForClass:[Config class]] pathForResource:@"foo" ofType:@"xml"]; This doesn't work either, because in order for the test to even compile code like this, it Config needs to be part of the Unit Test Target. If I add that, then the bundle for that class becomes the Unit Test bundle. (Ugh!) Am I approaching this the wrong way?

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  • How best to organize projects folders for unit tests in .NET?

    - by Dan Bailiff
    So I'm trying to introduce unit testing to my group. I've successfully upgraded a VS'05 web site project to a VS'08 web application, and now have a solution with the web app project and a unit test project. The issue now is how to fit this back into the source repository such that we don't break the build system and the unit test projects are persisted as well. Right now we have something like this: c:\root c:\root\projectA c:\root\projectB c:\root\projectC where projectA contains the sln file and all other related files/folders for the project. Now I have this new solution that looks like this: c:\root\projectA (parent folder) c:\root\projectA\projectA (the production code project) c:\root\projectA\projectA_Test (the unit test project) c:\root\projectA\TestResults c:\root\projecta\projectA.sln How do I integrate this new structure back into the code repository? I'd really prefer to keep the production code folder where it was in the source repository for the sake of the build, but is this necessary? If I keep the production code project in its usual place then where do I keep my unit test projects and how do I connect them with a sln file? Is it better to use this new structure and adjust the build process? I'd love to hear how other people are dealing with this issue of upgrading legacy projects to unit testing.

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