Junit testsuite setup

I need some advice in parallel execution where I want to test the same feature on various browsers parallely. So the test suite should be starting on each type of browser e. Chrome, Firefox parallely.

I tried with TestTemplate by providing the browser name parameter, but its running sequecially. Hi Darsh, not sure which strategy you are using for parallel test execution, and also provideTestTemplateInvocationContexts ExtensionContext context method implementation of TestTemplateInvocationContextProvider is important.

How ever you could try adding following properties in junit-platform. For more options for parallel execution configuration you check out JUnit 5 parallel test execution.

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Java is a trademark or registered trademark of Oracle Corporation. Examples at javabydeveloper is not connected to Oracle Corporation and is not sponsored by Oracle Corporation. Sign in. Forgot your password? This classpath will also be used to locate test classes that are part of the execution. The following example demonstrates how to configure the junitlauncher task to select test classes from multiple locations. In the above example, the testclasses element allows you to select multiple test classes that reside in different locations.

For further details on usage and configuration options please refer to the official Ant documentation for the junitlauncher task. For example, it can be used to run JUnit Vintage and JUnit Jupiter tests and print test execution results to the console.

An executable junit-platform-console-standalone You can run the standalone ConsoleLauncher as shown below. On some platforms you may run into system limitations on the length of a command line when creating a command line with lots of options or with long arguments.

Since version 1. Argument files are files that themselves contain arguments to be passed to the command. When the underlying picocli command line parser encounters an argument beginning with the character , it expands the contents of that file into the argument list. The arguments within a file can be separated by spaces or newlines. If the argument file does not exist or cannot be read, the argument will be treated literally and will not be removed.

This will likely result in an "unmatched argument" error message. You can troubleshoot such errors by executing the command with the picocli.

Multiple -files may be specified on the command line. The specified path may be relative to the current directory or absolute. You can pass a real parameter with an initial character by escaping it with an additional symbol. For example, somearg will become somearg and will not be subject to expansion.

In recent years, all mainstream build tools and IDEs provide built-in support for running tests directly on the JUnit Platform. In addition, the introduction of Suite support provided by the junit-platform-suite-engine module makes the JUnitPlatform runner obsolete. If you are using the JUnitPlatform runner, please migrate to the Suite support. You need the following artifacts and their dependencies on the classpath.

By default, display names will be used for test artifacts; however, when the JUnitPlatform runner is used to execute tests with a build tool such as Gradle or Maven, the generated test report often needs to include the technical names of test artifacts — for example, fully qualified class names — instead of shorter display names like the simple name of a test class or a custom display name containing special characters.

Please note that the test methods in the following example are annotated with org. Test JUnit Jupiter , not org.

Test JUnit 4. Moreover, in this case the test class must be public ; otherwise, some IDEs and build tools might not recognize it as a JUnit 4 test class. If you have multiple test classes you can create a test suite as can be seen in the following example. The JUnitPlatformSuiteDemo will discover and run all tests in the example package and its subpackages.

By default, it will only include test classes whose names either begin with Test or end with Test or Tests. In addition to instructing the platform which test classes and test engines to include, which packages to scan, etc.

For example, the JUnit Jupiter TestEngine supports configuration parameters for the following use cases. Changing the Default Test Instance Lifecycle. Setting the Default Display Name Generator.

Configuration Parameters are text-based key-value pairs that can be supplied to test engines running on the JUnit Platform via one of the following mechanisms. When running tests via one of the tools provided by the JUnit Platform you can specify configuration parameters as follows:. Console Launcher : use the --config command-line option.

Maven Surefire provider : use the configurationParameters property. The JUnit Platform configuration file: a file named junit-platform. This section describes the pattern matching syntax that is applied to the configuration parameters used for the following features. Otherwise, the value will be treated as a comma-separated list of patterns where each pattern will be matched against the fully qualified class name FQCN of each candidate class.

Any dot. All other characters in a pattern will be matched one-to-one against a FQCN. MyCustomImpl, org. MyCustomImpl or org. Tags are a JUnit Platform concept for marking and filtering tests. The programming model for adding tags to containers and tests is defined by the testing framework. Other testing frameworks may define their own annotation or other means for users to specify tags.

Tag expressions are boolean expressions with the operators! In addition, and can be used to adjust for operator precedence. Two special expressions are supported, any and none , which select all tests with any tags at all, and all tests without any tags, respectively. These special expressions may be combined with other expressions just like normal tags. If you are tagging your tests across multiple dimensions, tag expressions help you to select which tests to execute.

When tagging by test type e. To enable it, set the junit. In addition, you may configure the maximum number of buffered bytes to be used per executed test or container using junit. If enabled, the JUnit Platform captures the corresponding output and publishes it as a report entry using the stdout or stderr keys to all registered TestExecutionListener instances immediately before reporting the test or container as finished.

Please note that the captured output will only contain output emitted by the thread that was used to execute a container or test. Any output by other threads will be omitted because particularly when executing tests in parallel it would be impossible to attribute it to a specific test or container. The JUnit Platform provides the following listener APIs that allow JUnit, third parties, and custom user code to react to events fired at various points during the discovery and execution of a TestPlan.

LauncherSessionListener : receives events when a LauncherSession is opened and closed. LauncherDiscoveryListener : receives events that occur during test discovery. TestExecutionListener : receives events that occur during test execution. Such listeners may be implemented and automatically registered by a build tool or IDE, or they may be included in a third-party library — potentially registered for you automatically.

You can also implement and register your own listeners. Registering a LauncherSessionListener. Registering a LauncherDiscoveryListener. The JUnit Platform provides the following listeners which you may wish to use with your test suite. See JUnit Platform Reporting for details. TestExecutionListener that generates a summary of the test execution which can be printed via a PrintWriter.

TestExecutionListener that that tracks the unique IDs of all tests that were skipped or executed during the execution of the TestPlan and generates a file containing the unique IDs once execution of the TestPlan has finished.

Provide the org. Start flight recording when launching a test run. Flight Recorder can be started via java command line option:. Note, however, that Extension itself is just a marker interface. For example, to register a WebServerExtension for a particular test method, you would annotate the test method as follows. To register the WebServerExtension for all tests in a particular class and its subclasses, you would annotate the test class as follows. Extensions registered declaratively via ExtendWith at the class level, method level, or parameter level will be executed in the order in which they are declared in the source code.

If you wish to combine multiple extensions in a reusable way, you can define a custom composed annotation and use ExtendWith as a meta-annotation as in the following code listing. The above examples demonstrate how ExtendWith can be applied at the class level or at the method level; however, for certain use cases it makes sense for an extension to be registered declaratively at the field or parameter level.

Consider a RandomNumberExtension that generates random numbers that can be injected into a field or via a parameter in a constructor, test method, or lifecycle method. Extensions registered declaratively via ExtendWith on fields will be ordered relative to RegisterExtension fields and other ExtendWith fields using an algorithm that is deterministic but intentionally nonobvious. However, ExtendWith fields can be ordered using the Order annotation.

Developers can register extensions programmatically by annotating fields in test classes with RegisterExtension. When an extension is registered declaratively via ExtendWith , it can typically only be configured via annotations.

By default, extensions registered programmatically via RegisterExtension or declaratively via ExtendWith on fields will be ordered using an algorithm that is deterministic but intentionally nonobvious. This ensures that subsequent runs of a test suite execute extensions in the same order, thereby allowing for repeatable builds. However, there are times when extensions need to be registered in an explicit order.

Any RegisterExtension field or ExtendWith field not annotated with Order will be ordered using the default order which has a value of Integer. This allows Order annotated extension fields to be explicitly ordered before or after non-annotated extension fields. Extensions with an explicit order value less than the default order value will be registered before non-annotated extensions.

Similarly, extensions with an explicit order value greater than the default order value will be registered after non-annotated extensions. For example, assigning an extension an explicit order value that is greater than the default order value allows before callback extensions to be registered last and after callback extensions to be registered first, relative to other programmatically registered extensions. If a RegisterExtension field is static , the extension will be registered after extensions that are registered at the class level via ExtendWith.

Such static extensions are not limited in which extension APIs they can implement. In the following example, the server field in the test class is initialized programmatically by using a builder pattern supported by the WebServerExtension. In addition, static lifecycle methods annotated with BeforeAll or AfterAll as well as BeforeEach , AfterEach , and Test methods can access the instance of the extension via the server field if necessary.

The Kotlin programming language does not have the concept of a static field. However, the compiler can be instructed to generate a private static field using the JvmStatic annotation in Kotlin. If you want the Kotlin compiler to generate a public static field, you can use the JvmField annotation instead.

The following example is a version of the WebServerDemo from the previous section that has been ported to Kotlin. If a RegisterExtension field is non-static i.

By default, an instance extension will be registered after extensions that are registered at the method level via ExtendWith ; however, if the test class is configured with TestInstance Lifecycle. In the following example, the docs field in the test class is initialized programmatically by invoking a custom lookUpDocsDir method and supplying the result to the static forPath factory method in the DocumentationExtension.

The configured DocumentationExtension will be automatically registered as an extension at the method level. In addition, BeforeEach , AfterEach , and Test methods can access the instance of the extension via the docs field if necessary. Specifically, a custom extension can be registered by supplying its fully qualified class name in a file named org. Auto-detection is an advanced feature and is therefore not enabled by default.

For example, to enable auto-detection of extensions, you can start your JVM with the following system property. Registered extensions are inherited within test class hierarchies with top-down semantics. Similarly, extensions registered at the class-level are inherited at the method-level.

Furthermore, a specific extension implementation can only be registered once for a given extension context and its parent contexts. Consequently, any attempt to register a duplicate extension implementation will be ignored. An ExecutionCondition is evaluated for each container e. Similarly, an ExecutionCondition is evaluated for each test to determine if a given test method should be executed based on the supplied ExtensionContext.

Thus, there is no guarantee that a condition is evaluated because another extension might have already caused a container or test to be disabled. In other words, the evaluation works like the short-circuiting boolean OR operator. See the source code of DisabledCondition and Disabled for concrete examples. Sometimes it can be useful to run a test suite without certain conditions being active. For example, you may wish to run tests even if they are annotated with Disabled in order to see if they are still broken.

To do this, provide a pattern for the junit. The pattern can be supplied as a JVM system property, as a configuration parameter in the LauncherDiscoveryRequest that is passed to the Launcher , or via the JUnit Platform configuration file see Configuration Parameters for details. Refer to Pattern Matching Syntax for details. Common use cases include acquiring the test instance from a dependency injection framework or invoking a static factory method to create the test class instance.

If no TestInstanceFactory is registered, the framework will invoke the sole constructor for the test class to instantiate it, potentially resolving constructor arguments via registered ParameterResolver extensions.

Extensions that implement TestInstanceFactory can be registered on test interfaces, top-level test classes, or Nested test classes. Registering multiple extensions that implement TestInstanceFactory for any single class will result in an exception being thrown for all tests in that class, in any subclass, and in any nested class. Note that any TestInstanceFactory registered in a superclass or enclosing class i. Common use cases include injecting dependencies into the test instance, invoking custom initialization methods on the test instance, etc.

For a concrete example, consult the source code for the MockitoExtension and the SpringExtension. TestInstancePreDestroyCallback defines the API for Extensions that wish to process test instances after they have been used in tests and before they are destroyed.

Common use cases include cleaning dependencies that have been injected into the test instance, invoking custom de-initialization methods on the test instance, etc. If a test class constructor, test method , or lifecycle method see Test Classes and Methods declares a parameter, the parameter must be resolved at runtime by a ParameterResolver. Generally speaking, parameters may be resolved by name , type , annotation , or any combination thereof. If you wish to implement a custom ParameterResolver that resolves parameters based solely on the type of the parameter, you may find it convenient to extend the TypeBasedParameterResolver which serves as a generic adapter for such use cases.

Due to a bug in the byte code generated by javac on JDK versions prior to JDK 9, looking up annotations on parameters directly via the core java. Parameter API will always fail for inner class constructors e. The ParameterContext API supplied to ParameterResolver implementations therefore includes the following convenience methods for correctly looking up annotations on parameters.

Extension authors are strongly encouraged to use these methods instead of those provided in java. Parameter in order to avoid this bug in the JDK. TestWatcher defines the API for extensions that wish to process the results of test method executions. Specifically, a TestWatcher will be invoked with contextual information for the following events.

Extensions implementing this interface can be registered at the method level or at the class level. In the latter case they will be invoked for any contained test method including those in Nested classes. Any instances of ExtensionContext. The following interfaces define the APIs for extending tests at various points in the test execution lifecycle.

Consult the following sections for examples and the Javadoc for each of these interfaces in the org. BeforeTestExecutionCallback and AfterTestExecutionCallback define the APIs for Extensions that wish to add behavior that will be executed immediately before and immediately after a test method is executed, respectively. As such, these callbacks are well suited for timing, tracing, and similar use cases.

The following example shows how to use these callbacks to calculate and log the execution time of a test method. Since the TimingExtensionTests class registers the TimingExtension via ExtendWith , its tests will have this timing applied when they execute.

The following is an example of the logging produced when TimingExtensionTests is run. Exceptions thrown during the test execution may be intercepted and handled accordingly before propagating further, so that certain actions like error logging or resource releasing may be defined in specialized Extensions. The following example shows an extension which will swallow all instances of IOException but rethrow any other type of exception. Another example shows how to record the state of an application under test exactly at the point of unexpected exception being thrown during setup and cleanup.

Note that unlike relying on lifecycle callbacks, which may or may not be executed depending on the test status, this solution guarantees execution immediately after failing BeforeAll , BeforeEach , AfterEach or AfterAll. Multiple execution exception handlers may be invoked for the same lifecycle method in order of declaration.

If one of the handlers swallows the handled exception, subsequent ones will not be executed, and no failure will be propagated to JUnit engine, as if the exception was never thrown. Handlers may also choose to rethrow the exception or throw a different one, potentially wrapping the original.

Extensions implementing LifecycleMethodExecutionExceptionHandler that wish to handle exceptions thrown during BeforeAll or AfterAll need to be registered on a class level, while handlers for BeforeEach and AfterEach may be also registered for individual test methods.

Each context may specify a custom display name and a list of additional extensions that will only be used for the next invocation of the TestTemplate method. The following example shows how to write a test template as well as how to register and implement a TestTemplateInvocationContextProvider. In this example, the test template will be invoked twice. The display names of the invocations will be apple and banana as specified by the invocation context.

Each invocation registers a custom ParameterResolver which is used to resolve the method parameter. The output when using the ConsoleLauncher is as follows. The TestTemplateInvocationContextProvider extension API is primarily intended for implementing different kinds of tests that rely on repetitive invocation of a test-like method albeit in different contexts — for example, with different parameters, by preparing the test class instance differently, or multiple times without modifying the context.

Please refer to the implementations of Repeated Tests or Parameterized Tests which use this extension point to provide their functionality. Usually, an extension is instantiated only once. So the question becomes relevant: How do you keep the state from one invocation of an extension to the next? Extensions may put values into a store for later retrieval. See the TimingExtension for an example of using the Store with a method-level scope.

It is important to remember that values stored in an ExtensionContext during test execution will not be available in the surrounding ExtensionContext. Since ExtensionContexts may be nested, the scope of inner contexts may also be limited. Consult the corresponding Javadoc for details on the methods available for storing and retrieving values via the Store.

The junit-platform-commons artifact exposes a package named org. TestEngine and Extension authors are encouraged to use these supported methods in order to align with the behavior of the JUnit Platform.

AnnotationSupport provides static utility methods that operate on annotated elements e. These include methods to check whether an element is annotated or meta-annotated with a particular annotation, to search for specific annotations, and to find annotated methods and fields in a class or interface. Some of these methods search on implemented interfaces and within class hierarchies to find annotations. Consult the Javadoc for AnnotationSupport for further details.

ClassSupport provides static utility methods for working with classes i. Consult the Javadoc for ClassSupport for further details. ReflectionSupport provides static utility methods that augment the standard JDK reflection and class-loading mechanisms. These include methods to scan the classpath in search of classes matching specified predicates, to load and create new instances of a class, and to find and invoke methods.

Some of these methods traverse class hierarchies to locate matching methods. Consult the Javadoc for ReflectionSupport for further details. Consult the Javadoc for ModifierSupport for further details. When executing a test class that contains one or more test methods, a number of extension callbacks are called in addition to the user-supplied test and lifecycle methods.

The following diagram illustrates the relative order of user-supplied code and extension code. User-supplied test and lifecycle methods are shown in orange, with callback code implemented by extensions shown in blue. The grey box denotes the execution of a single test method and will be repeated for every test method in the test class.

The following table further explains the sixteen steps in the User code and extension code diagram. In the simplest case only the actual test method will be executed step 8 ; all other steps are optional depending on the presence of user code or extension support for the corresponding lifecycle callback.

For further details on the various lifecycle callbacks please consult the respective Javadoc for each annotation and extension. All invocations of user code methods in the above table can additionally be intercepted by implementing InvocationInterceptor. That means that, given two extensions Extension1 and Extension2 with Extension1 registered before Extension2 , any "before" callbacks implemented by Extension1 are guaranteed to execute before any "before" callbacks implemented by Extension2.

Similarly, given the two same two extensions registered in the same order, any "after" callbacks implemented by Extension1 are guaranteed to execute after any "after" callbacks implemented by Extension2. Extension1 is therefore said to wrap Extension2. JUnit Jupiter also guarantees wrapping behavior within class and interface hierarchies for user-supplied lifecycle methods see Test Classes and Methods. BeforeAll methods are inherited from superclasses as long as they are not hidden or overridden.

Furthermore, BeforeAll methods from superclasses will be executed before BeforeAll methods in subclasses. Similarly, BeforeAll methods declared in an interface are inherited as long as they are not hidden or overridden , and BeforeAll methods from an interface will be executed before BeforeAll methods in the class that implements the interface. AfterAll methods are inherited from superclasses as long as they are not hidden or overridden.

Furthermore, AfterAll methods from superclasses will be executed after AfterAll methods in subclasses. Similarly, AfterAll methods declared in an interface are inherited as long as they are not hidden or overridden , and AfterAll methods from an interface will be executed after AfterAll methods in the class that implements the interface.

BeforeEach methods are inherited from superclasses as long as they are not overridden. Furthermore, BeforeEach methods from superclasses will be executed before BeforeEach methods in subclasses. Similarly, BeforeEach methods declared as interface default methods are inherited as long as they are not overridden , and BeforeEach default methods will be executed before BeforeEach methods in the class that implements the interface.

AfterEach methods are inherited from superclasses as long as they are not overridden. Furthermore, AfterEach methods from superclasses will be executed after AfterEach methods in subclasses. Similarly, AfterEach methods declared as interface default methods are inherited as long as they are not overridden , and AfterEach default methods will be executed after AfterEach methods in the class that implements the interface.

The following examples demonstrate this behavior. Please note that the examples do not actually do anything realistic. Instead, they mimic common scenarios for testing interactions with the database. All methods imported statically from the Logger class log contextual information in order to help us better understand the execution order of user-supplied callback methods and callback methods in extensions.

The following sequence diagram helps to shed further light on what actually goes on within the JupiterTestEngine when the DatabaseTestsDemo test class is executed.

JUnit Jupiter does not guarantee the execution order of multiple lifecycle methods that are declared within a single test class or test interface. It may at times appear that JUnit Jupiter invokes such methods in alphabetical order. However, that is not precisely true. The ordering is analogous to the ordering for Test methods within a single test class. Lifecycle methods that are declared within a single test class or test interface will be ordered using an algorithm that is deterministic but intentionally non-obvious.

This ensures that subsequent runs of a test suite execute lifecycle methods in the same order, thereby allowing for repeatable builds. In addition, JUnit Jupiter does not support wrapping behavior for multiple lifecycle methods declared within a single test class or test interface. The following example demonstrates this behavior. Specifically, the lifecycle method configuration is broken due to the order in which the locally declared lifecycle methods are executed.

Test data is inserted before the database connection has been opened, which results in a failure to connect to the database. The database connection is closed before deleting the test data, which results in a failure to connect to the database. The following sequence diagram helps to shed further light on what actually goes on within the JupiterTestEngine when the BrokenLifecycleMethodConfigDemo test class is executed. Due to the aforementioned behavior, the JUnit Team recommends that developers declare at most one of each type of lifecycle method see Test Classes and Methods per test class or test interface unless there are no dependencies between such lifecycle methods.

One of the prominent goals of JUnit 5 is to make the interface between JUnit and its programmatic clients — build tools and IDEs — more powerful and stable. JUnit 5 introduces the concept of a Launcher that can be used to discover, filter, and execute tests. The launcher API is in the junit-platform-launcher module.

An example consumer of the launcher API is the ConsoleLauncher in the junit-platform-console project.

Having test discovery as a dedicated feature of the platform itself frees IDEs and build tools from most of the difficulties they had to go through to identify test classes and test methods in previous versions of JUnit.

You can select classes, methods, and all classes in a package or even search for all tests in the class-path or module-path. Discovery takes place across all participating test engines. The resulting TestPlan is a hierarchical and read-only description of all engines, classes, and test methods that fit the LauncherDiscoveryRequest. The client can traverse the tree, retrieve details about a node, and get a link to the original source like class, method, or file position.

Every node in the test plan has a unique ID that can be used to invoke a particular test or group of tests. Clients can register one or more LauncherDiscoveryListener implementations via the LauncherDiscoveryRequestBuilder to gain insight into events that occur during test discovery. By default, the builder registers an "abort on failure" listener that aborts test discovery after the first discovery failure is encountered. The default LauncherDiscoveryListener can be changed via the junit. To execute tests, clients can use the same LauncherDiscoveryRequest as in the discovery phase or create a new request.

Test progress and reporting can be achieved by registering one or more TestExecutionListener implementations with the Launcher as in the following example. There is no return value for the execute method, but you can use a TestExecutionListener to aggregate the results. JUnit provides three TestEngine implementations.

Third parties may also contribute their own TestEngine by implementing the interfaces in the junit-platform-engine module and registering their engine. For example, the junit-jupiter-engine module registers its org. JupiterTestEngine in a file named org.

If any third-party TestEngine claims to be junit-jupiter or junit-vintage , an exception will be thrown, immediately halting execution of the JUnit Platform.

If any third-party TestEngine uses the junit- prefix for its ID, a warning message will be logged. Later releases of the JUnit Platform will throw an exception for such violations. For example, an example. PostDiscoveryFilter file is loaded and applied automatically. Registered implementations of LauncherSessionListener are notified when a LauncherSession is opened before a Launcher first discovers and executes tests and closed when no more tests will be discovered or executed.

The scope of a launcher session depends on the used IDE or build tool but usually corresponds to the lifecycle of the test JVM. A custom listener that starts an HTTP server before executing the first test and stops it after the last test has been executed, could look like this:. This sample uses the HTTP server implementation from the jdk. In order for the listener to be picked up by JUnit Platform, you need to register it as a service by adding a resource file with the following name and contents to your test runtime classpath e.

LauncherDiscoveryListener file is loaded and registered automatically. TestExecutionListener file is loaded and registered automatically. In such cases, the author of a TestExecutionListener may choose to make the listener configurable via configuration parameters.

See the UniqueIdTrackingListener for an example. Sometimes it can be useful to run a test suite without certain execution listeners being active. For example, you might have custom a TestExecutionListener that sends the test results to an external system for reporting purposes, and while debugging you might not want these debug results to be reported.

TestExecutionListener file can be deactivated. In other words, any TestExecutionListener registered explicitly via the LauncherDiscoveryRequest cannot be deactivated via the junit. In addition, since execution listeners are registered before the test run starts, the junit. This configuration parameter cannot be supplied in the LauncherDiscoveryRequest that is passed to the Launcher.

If you require fine-grained control over automatic detection and registration of test engines and listeners, you may create an instance of LauncherConfig and supply that to the LauncherFactory. Typically, an instance of LauncherConfig is created via the built-in fluent builder API, as demonstrated in the following example. The junit-platform-reporting artifact contains TestExecutionListener implementations that generate test reports.

These listeners are typically used by IDEs and build tools. The package org. Note that the generated XML format is compatible with the de facto standard for JUnit 4 based test reports that was made popular by the Ant build system. The JUnit Platform supports the declarative definition and execution of suites of tests from any test engine using the JUnit Platform. In addition to the junit-platform-suite-api and junit-platform-suite-engine artifacts, you need at least one other test engine and its dependencies on the classpath.

By annotating a class with Suite it is marked as a test suite on the JUnit Platform. As seen in the following example, selector and filter annotations can then be used to control the contents of the suite. The junit-platform-testkit artifact provides support for executing a test plan on the JUnit Platform and then verifying the expected results. As of JUnit Platform 1. The org. The key entry point into this API is the EngineTestKit which provides static factory methods named engine and execute.

It is recommended that you select one of the engine variants to benefit from the fluent API for building a LauncherDiscoveryRequest. If you want to test your own TestEngine implementation, you need to use its unique engine ID.

One of the most common features of the Test Kit is the ability to assert statistics against events fired during the execution of a TestPlan. The following tests demonstrate how to assert statistics for containers and tests in the JUnit Jupiter TestEngine.

For details on what statistics are available, consult the Javadoc for EventStatistics. If you find that asserting statistics alone is insufficient for verifying the expected behavior of test execution, you can work directly with the recorded Event elements and perform assertions against them. For example, if you want to verify the reason that the skippedTest method in ExampleTestCase was skipped, you can do that as follows. The assertThatEvents method in the following example is a shortcut for org.

For details on what conditions are available for use with AssertJ assertions against events, consult the Javadoc for EventConditions. If you want to verify the type of exception thrown from the failingTest method in ExampleTestCase , you can do that as follows.

For details on what conditions are available for use with AssertJ assertions against events and execution results, consult the Javadoc for EventConditions and TestExecutionResultConditions , respectively.

Although typically unnecessary, there are times when you need to verify all of the events fired during the execution of a TestPlan. This allows us to enforce the order in which the test methods are executed, which in turn allows our verifyAllJupiterEvents test to be reliable. If you want to do a partial match with or without ordering requirements, you can use the methods assertEventsMatchLooselyInOrder and assertEventsMatchLoosely , respectively.

The debug invocation from the preceding example results in output similar to the following. One of the major goals of JUnit 5 is to improve maintainers' capabilities to evolve JUnit despite its being used in many projects. DisplayName "is instantiated with new Stack ". DisplayName "when new". DisplayName "is empty". DisplayName "throws EmptyStackException when popped".

DisplayName "throws EmptyStackException when peeked". DisplayName "after pushing an element". DisplayName "it is no longer empty". DisplayName "returns the element when popped and is empty". DisplayName "returns the peek element but remains not empty". JUnitPlatform; import org. ExcludePackages; import org. SelectPackages; import org.

JUnitPlatform ;. ExcludePackages ;. SelectPackages ;. RunWith ;. IncludePackages; import org. IncludePackages ;.

ExcludeTags; import org. ExcludeTags ;. SelectClasses; import org. RunWith; import com. MyUtilsTest; import com. SelectClasses ;. MyUtilsTest ;. TestingAStack ;. Leave a Reply Cancel reply Your email address will not be published. Iconic One Theme Powered by Wordpress. AfterAll ; import org.