Scala test assert no exception. not handled by recover().

Scala test assert no exception Test import org. With ShouldMatchers mixed in, you can check for an expected exception like this: evaluating { s. val notification: Task[Unit] = myServer. * -- -n "CheckinTests FunctionalTests" -l "org. If a class instance is passed for a type that could not possibly be used to catch an exception (such as String , for example), this method will complete abruptly with a Assert that an Option[String] is None. This method is intended to be used in the Scala interpreter to eliminate large stack traces when trying out ScalaTest assertions and matcher expressions. ) tests use to do their work. I'm trying to incorporate ScalaTest into my Java project; replacing all JUnit tests with ScalaTests. We can use ScalaTest to test scenarios that throw exceptions, as well as to handle failures in Try or Future constructs. * -- -n CheckinTests > test-only org. scala) in the src/test/scala directory. Because ScalaTest uses exceptions to signal failed assertions, normally execution of a test will stop as soon as the first failed assertion is encountered. assert(1 + 1 === 3, "this is a clue") and in expect: expect(3, "this is a clue") { 1 + 1} The exceptions thrown by the previous two statements will include the clue string, "this is a clue", in the exceptions detail message. Test Refactor using Scala when different tests need different fixtures. 10 because I added submodules using Spark which is built for Scala 2. Trait that contains ScalaTest's basic assertion methods. If the condition is None, this method returns normally. test ===== test session starts ===== platform linux2 -- Python 2. Later if you prefer you can switch to the more expressive matchers DSL. Mar 2, 2011 · Since a unit value is unlikely to be of much use to a test, this trait is useful when the unit value fixture is actually never passed into any tests. Try and make assertions on the value of Try. Arguments. This test's full assert(Set (1, 2, 3). Let’s test the previously created method using assertThrows (): The test fails if there is no RuntimeException thrown in the explodingMethod (). FunSuite { test("a simple munit test") { //test logic goes here } } By default, MUnit also supports test cases that return scala. ExecutionContext. Exceptions don't do what you want when you're working in a threaded context, because you want to know about the exception in the caller, and the exception happens in the future's thread. wordspec (If a test fails because of an exception, the test function invoked by withFixture will result The second test has result type Assertion: scala> def addNow Refactor using Scala when different tests need different fixtures. After that, you can let get unwrap the Try and retrieve a value if it was either a Success or a handled Failure, or it will re-throw if it's still a Failure, i. Slow it should "be non-empty" taggedAs(Slow) in assert is annotated with @elidable(ASSERTION) meaning you can compile your program with -Xelide-below ASSERTION or with -Xdisable-assertions and the compiler will not generate the bytecode for the assertions. Feb 19, 2014 · Assert two collections are equal using custom equals method in Java test frameworks 0 AssertJ: Asserting that a an array of objects with fields (and values) contains (equals) another array of objects with fields (and values) Nov 3, 2011 · Assertions. alterState("do this") notification onComplete { case Failure(_) => fail() case Success(_) => succeed. Where ScalaTest differs from other testing tools is its ability to support a number of different testing styles such as XUnit and BDD out of the box. testng. isFailure shouldBe true // Use TryValues conversions test(0, 1). ScalaTest makes three assertions available by default in any style trait. You can use: assertThrows to ensure a bit of code throws an expected exception. As a result, Scala. giveMeAFuture ScalaFutures. To get the same clue in the detail message of an exception thrown by a failed assertThrows call requires using withClue: To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write: scala> (new MySuite). This example used intercept to catch the exception, and assert to test the exception message, but this isn’t the only possible solution. e. May 6, 2022 · I have the following code, which is used to (sha) hash columns in a spark dataframe: import org. Jul 16, 2021 · Lets say I've a method guardedRun that runs a call method in a Try block. Those pesky parens . 11 dependencies for the tests, even though my whole project was now using 2. ScalaTest/Scalactic 2. These collections are returned as Iterable[T], so I am interested in the contents of the collection, even if the underlying types d Nov 13, 2023 · In Scala, assertions are written using for checking expected exceptions, ScalaTest’s intercept import org. someFunction(argNowThrowsException) should throw IllegalArgumentException and note I am not using @Test JUnit structure. To get moving quickly in ScalaTest, learn and use these three assertions. To specify expected arguments for a functional mock, use expects. fails to assert that the effect fails with a checked exception, Assertion. Variants of assert intended for use with static analysis tools are also provided: assume, require Mar 2, 2011 · Trait that contains ScalaTest's basic assertion methods. * -- -n FunctionalTests -l org. Else, it throws TestFailedException with the String value of the Some, as well as the String obtained by invoking toString on the specified message, included in the TestFailedException's detail message. Jul 15, 2015 · I found the cause for this. Mar 2, 2010 · To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write: scala> (new ExampleSuite). The assertThrows method also conveniently returns the caught exception, allowing further inspection or validation of its properties, such as the error message. execute("my favorite test") Or: scala> (new MySuite). exit() is called: For teams coming from xUnit, FunSuite feels comfortable and familiar while still giving some of the benefits of BDD: FunSuite makes it easy to write descriptive test names, natural to write focused tests, and generates specification-like output that can facilitate communication among stakeholders. It is really how the Scala plug-in of IDEA works. execute(testName = "my favorite test") The configMap parameter. Apr 26, 2013 · Verify it has happened either by asserting that your test will throw such an exception: @Test(expected = AnException. Mar 18, 2024 · An exception is an event that changes the normal flow of a program. concurrent. For example, given the same code as above but using ScalaTest assertions: But I've modified the function, and now I want the test to expect/assert the function given that value throws an IllegalArgumentException. If no expected arguments are given, mocks accept any arguments. If the result was the Unit value, it will simply say that no exception was thrown: scala> trap { x shouldEqual 12 } res2: Throwable = No exception was thrown. assert() Use assert() to fail a test if a boolean condition does not hold true. Slow > test-only org. Network" Specifying Chosen Styles ScalaTest lets you use Scala's assertion syntax, assert(1 === 2) To test whether a bit of code or does not throw any exception, you'll get a test failure Mar 18, 2024 · Moving onto numeric assertions, these will work on any Numeric data type in Scala: assert(0)(isZero) && assert(1)(isPositive) && assert(-1)(isNegative) && assert(102)(approximatelyEquals(100, 2)) As we can see, isZero asserts that the value is zero, while isPositive and isNegative assert that a value is either positive or negative, respectively. As mentioned above, you would call run on the effect to get an exit value and then use Assertion. Try, enabling you to make assertions about the value of a Success or the exception of a Failure. value shouldBe 0 test(1, 1). For example, assume we have two values: Mar 18, 2024 · class MUnitTest extends munit. ListBuffer import org. 2. Trait providing class Checkpoint, which enables multiple assertions to be performed within a test, with any failures accumulated and reported together at the end of the test. Then we’ll see their differences in semantics and exception behavior and see which one to use in our programs. assert To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write: scala> (new ExampleSuite). 1 - org. runTest passes that test function to the withFixture(NoArgTest) method, which is responsible for actually running the test by invoking the function. Because intercept will end the test with a TestFailedException if your code doesn’t throw an exception, your test can be as simple as this: test ("catching an exception") { intercept[Exception] { pizza. Exception handling is the mechanism to respond to the occurrence of an exception. Mar 2, 2010 · Refactor using Scala when different tests need different fixtures. {AppendedClues, Matchers, WordSpec} class SomeTest extends WordSpec with Matchers with AppendedClues { "Clues" should { "not be appended" when { "assertions pass" in { "hi" should equal ("hi") withClue "Greetings scala tester!" Testing Style Descriptions and Examples; The FunSuite style. Set. exception should have message "should be zero" } } The NoSuchElementException would cause the test to fail, but without providing a stack depth pointing to the failing line of test code. exit(), the simplest way to test it was actually called is to replace your SecurityManager with one that'll throw an ExitException (subclassing SecurityException) when System. 2. Returns a user friendly string for this suite, composed of the simple name of the class (possibly simplified further by removing dollar signs if added by Mar 21, 2012 · I think there is a problem related to unit test logic. This trait is designed to be used independently of anything else in ScalaTest, though, so you can mix it into anything. Aug 22, 2016 · If you really wish to go with a method using System. 10. You can also state that no exception should be thrown by some code, like this: noException should be thrownBy 0 / 1. 0 release is that they now fully support Scala. duration. scala> "7" should beAsIntsGreaterThan ("8") org. The thrown exception must be an instance of the type specified by the type parameter of this method. 2 -- /usr/bin/python collected 1 items tests/test_div_zero. sql. Instead each test in the FixtureSuite is defined as a no-arg function; no tests are defined as one-arg functions. Executes the block of code passed as the second parameter, and, if it completes abruptly with a ModifiableMessage exception, prepends Mar 2, 2011 · package scalatest. junit. Thus, they’re automatically imported to all Scala programs. This should be quite rare, but occasionally can be useful. Sometimes you need to test whether a method throws an expected exception under certain circumstances, such as when invalid arguments are passed to the method. Assertions. scalatestplus. failed) { e => e shouldBe a [SomeExceptionType] } } Or you can perform some other assertions in there. Sep 25, 2008 · If you are using pytest you can use pytest. Also, for collection sizes, there are some default messages. FailedStatus; (class) FeatureSpec (trait) FeatureSpecLike (object) (class) Filter In Scala, exceptions can be caught based on traits they implement, so it may at times make sense to specify a trait that the intercepted exception's class must mix in. When multiple tests need to work with the same fixtures, it is important to try and avoid duplicating the fixture code across those tests. create(degree)) -- what doesn't compile ? May 9, 2019 · ScalaFutures enable to assert a Future is ready within a a specified time period like so. Slow it should "be non-empty" taggedAs(Slow) in package concurrent. The most significant enhancement to ScalaTest and Scalactic in the 3. Mar 18, 2024 · If any other exception type (or no exception at all) is thrown, ScalaTest will raise a TestFailedException. Assertions into your test class: import org. Class used via an implicit conversion to enable any two objects to be compared with === in assertions in tests. Pending; (class) PendingNothing (object) (trait) PrivateMethodTester (class) PropSpec ScalaTest/Scalactic 2. Asking for help, clarification, or responding to other answers. ScalaTest 3. 0 includes the enhancements and deprecations listed below. import org. If false, assert will complete abruptly with an AssertionError. Slow it should "be non-empty" taggedAs(Slow) in ScalaTest lets you use Scala's assertion syntax, assert(1 === 2) To test whether a bit of code or does not throw any exception, you'll get a test failure Set. This can significantly reduce bytecode size and improve performance if you have a large number of asserts. AssertionsForJUnit into your test class: To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write: scala> (new ExampleSuite). 6. In the previous example, we have a single test "sum of integers" that checks that 2 + 2 equals 4. Basically, if your future doesn't fail like you expect, the test will fail. In Java, I have a test The NoSuchElementException would cause the test to fail, but without providing a stack depth pointing to the failing line of test code. raises(ZeroDivisionError): 1/0 And the result: $ py. If you provide a value for the configMap parameter, this method will pass it to run. I'm trying to unit-test some Scala that is very collection-heavy. dies to assert that the effect fails with an unchecked exception, or Assertion. Aug 6, 2024 · Is there a better way to assert that a method throws an exception in JUnit 5? Currently, I have to use a @Rule in order to verify that my test throws an exception, but this doesn't work for the cases where I expect multiple methods to throw exceptions in my test. I'd like to do something like: Object. The test passes if all the assertions are correct and fails otherwise. 1. assertEquals import FeatureSpec is primarily intended for acceptance testing, including facilitating the process of programmers working alongside non-programmers to define the acceptance requirements. tags. String], clue: Any) : Unit Assert that an Option[String] is None. Although the test would fail if an exception is thrown even if there was no Assert around it, the value of this approach is that you can then distinguish between unmet expectations and bugs in your tests, and you have the option of adding a custom message that will be displayed in Jun 23, 2011 · New way since 2011: Matchers and AppendedClue 1 traits. Slow org. Perhaps the most tricky part of writing assertions using ScalaTest matchers is remembering when you need or don't need parentheses, but bearing in mind a few simple rules should help. Exceptions can be checked or unchecked. util. js support required a very large number of changes to the ScalaTest's eight-year old codebase. Jan 19, 2012 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To use assertions, mix org. The NoSuchElementException would cause the test to fail, but without providing a stack depth pointing to the failing line of test code. 10, and somehow IDEA still picked Scala 2. assertEquals import The most significant enhancement to ScalaTest and Scalactic in the 3. charAt(-1) } should produce [IndexOutOfBoundsException] If you pass the previous Boolean expression, left == right to assert in a ScalaTest test, a failure will be reported that, because assert is implemented as a macro, includes reporting the left and right values. 0. I am current doing something similar to the following: @Test(expected=classOf[NullPointerException]) def someTest() = { // Some test code } But I get the following compiler error: error: wrong number of arguments for constructor Test: ()org. lang. size == 3) } // 'it' now refers to 'A non-empty Set' it should "return a contained value when head is invoked" is (pending) // Define a pending test import tagobjects. Feb 3, 2024 · As shown, you catch the exception in a value named something like thrown, and then test the message from the exception inside an assert method. You can assign the result of intercept to a val which then you can compare to the expected value using assert or assertResult from scalatest. A set of assert functions are provided for use as a way to document and dynamically check invariants in code. py:6: test_div_zero PASSED Trait that provides an implicit conversion that adds success and failure methods to scala. someMethod(); The latter option is required if your test is designed to prove intermediate code handles the exception (i. I want to test the exception handling in guardedRun. apache. exceptions. size == 3) // name is: "A Set (when non-empty) should have the correct size"} // Define a pending test by using (pending) for the body "return a contained value when head is invoked" is (pending) import tagobjects. You can use the assertions provided by this trait in any ScalaTest Suite, because Suite mixes in this trait. Assertions. Here's an example AnyWordSpec: package org. boom } } In any Scala program, you can write assertions by invoking assert and passing in a Boolean expression, such as: val left = 2 val right = 1 assert(left == right) If the passed expression is true, assert will return normally. functions. Jul 4, 2015 · To test if my code is throwing expected exception I use the following syntax: an [IllegalArgumentException] should be thrownBy(Algorithms. Subclasses may override this method to define and/or discover tags in a custom manner, but overriding method implementations should never return an empty Set as a value. We will put our file (TestSpec. Provide details and share your research! But avoid …. execute("my favorite test") Or: scala> (new ExampleSuite). Nov 11, 2022 · I have a custom runtime exception: case class AEMAuthenticationException( message: String ) extends RuntimeException(message) while writing test, I am using AssertThrows: assertThrows[. 11 before and I switched it to use 2. Definition Classes org Companion object that facilitates the importing of Assertions members as an alternative to mixing it in. No source code using ScalaTest/ScalaUtils 2. MUnit provides a few ways to fail a test given a condition. Assertions import scala. Slow "should be non-empty" taggedAs (Slow) in { // Tag a test by placing a tag object after Jun 4, 2017 · Short answer: no. The advent of Scala. not handled by recover(). I show a NullPointerException here but the same technique should work with any Throwable type. Future . Option[java. global class ServerSpec extends FlatSpec with ScalaFutures { "Server" should "notify client upon completion" in { val notification: Task[Unit In Scala, exceptions can be caught based on traits they implement, so it may at times make sense to specify a trait that the intercepted exception's class must mix in. If it fails, but throws a different exception, the test will fail. I have already mocked the parameters etc, however I am not sure how to use Mockito to test that no exception has been thrown from the method? Current test code: If the result was the Unit value, it will simply say that no exception was thrown: scala> trap { x shouldEqual 12 } res2: Throwable = No exception was thrown. collection. Dec 1, 2014 · Since we want to use the exception as a value and not to control an exceptional flow, we could use scala. To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write: scala> (new MySuite). get-fixture methods: The extract method refactor helps you create a fresh instances of mutable fixture objects in each test that needs them, but doesn't help you clean them up when you're done. trait NoArgTest extends () ⇒ Unit A test function taking no arguments, which also provides a test name and config map. To specify expected arguments for a proxy mock, use withArgs or withArguments. 0 Release Notes. In NUnit, you can use: Assert. x should break, but you will likely need to do a clean build to upgrade. Refactor using Scala when different tests need different fixtures. Mar 2, 2011 · Trait providing class Checkpoint, which enables multiple assertions to be performed within a test, with any failures accumulated and reported together at the end of the test. At one point, I want to check if Guice's Injector injects the correct type. . Mar 2, 2019 · For more information on test tags, see the documentation for Suite. BeforeMethod class ExampleSuite extends Assertions { var sb: StringBuilder = _ var lb: ListBuffer[String To execute each test, Suite's implementation of the runTest method wraps an invocation of the appropriate test method in a no-arg function. Dec 28, 2023 · In the Scala ecosystem, ScalaTest is one of the most popular testing frameworks. whenReady(f. Similar to the intercept () method, we can also utilize any parent type of RuntimeException. Now, we’ll extend the AnyFlatSpec class: class TestSpec extends AnyFlatSpec { // write tests here } Apr 21, 2017 · You define the type of exception you are expecting with intercept and you run the code that will throw the exception within the function. mutable. Assertion = Succeeded When AddSpec is constructed, the second test will be implicitly converted to Future[Assertion] and registered. scalatest. TestFailedException: "7". _ import scala. create(degree)) is there any way to test if thrown exception contains expected message like: an [IllegalArgumentException(expectedMessage)] should be thrownBy(Algorithms. In addition, you can instruct a mock to return a particular value or throw an exception when that expectation is met. empty. Scala only allows unchecked exceptions, though. def toString (): String. This stack depth, provided by TestFailedException (and a few other ScalaTest exceptions), makes it quicker for users to navigate to the cause of the failure. scala package. spark. Given a Future returned by the code you are testing, you need not block until the Future completes before performing assertions against its value. ScalaFutures import scala. This means that, at compile-time, we won’t be able to know if a method is throwing an exception we are not def assert(o: scala. {sha2,lit, col} object hashing { def Trait that contains ScalaTest's basic assertion methods. This trait exists so that it can be mixed into two exception superclasses, StackDepthException , from which extend several exceptions that do not depend on Trait providing class Checkpoint, which enables multiple assertions to be performed within a test, with any failures accumulated and reported together at the end of the test. runAsync, 20. assert statements can be elided at runtime by providing the command line argument -Xdisable-assertions to the scala command. 5. For teams coming from xUnit, the FunSuite style feels comfortable and familiar while still giving some of the benefits of BDD: the FunSuite style makes it easy to write descriptive test names, natural to write focused tests, and generates specification-like output that can facilitate communication among stakeholders. Getting started with JUnit 4 and Scala. Nov 13, 2023 · In Scala, assertions are written using for checking expected exceptions, ScalaTest’s intercept import org. Then I can test that exception variable in the assert method. If you are just checking whether your function behaves properly and no exceptions are expected during this proper behavior, you just write it and if it throws any exception, your test fails. S - show short stack traces F - show full stack traces For example, configuring short stack traces on standard output in build. Mar 18, 2024 · We can refer to Scala’s official documentation for more information about which style will benefit our team. object Task { sealed trait TaskResponse case class TaskReport(returnCode: Int = 0, exception: Option[Throwable] = None) extends TaskResponse Mar 18, 2024 · ScalaTest is one of the most popular, complete and easy-to-use testing frameworks in the Scala ecosystem. 20 -- pytest-2. 5 < Back < Back In Scala, exceptions can be caught based on traits they implement, so it may at times make sense to specify a trait that the intercepted exception's class must mix in. We use the assertion method assertEquals to check that two values are equal. ScalaTest supports asynchronous non-blocking testing. Implicits. raises(Exception):. If a test has no associated tags, its name does not appear as a key in the returned Map. class) Or by normal mock verification: verify(obj). acme. DataFrame import org. Dec 28, 2023 · Another way to test for an exception is by using the assertThrows () method. Asynchronous testing. If the passed block of code results in a value other than Unit, the NormalResult's toString will print the value: scala> trap { "Dude!" } res3: Throwable = No exception was thrown. success. sum addNow: (addends: Int*)Int scala> val sum: Int = addNow(1, 2) sum: Int = 3 scala> assert(sum == 3) res1: org. Both assert and require are defined in the Predef. If a class instance is passed for a type that could not possibly be used to catch an exception (such as String , for example), this method will complete abruptly with a Jan 4, 2014 · test("some test") { val f: Future[Something] = someObject. It is important to use assertions in each and every test to describe what to check. examples. _ import org. The following code shows that you don’t have to catch the To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write: scala> (new ExampleSuite). A test fixture is composed of the objects and other artifacts (files, sockets, database connections, etc. Sharing fixtures . 4. So instead of calling parse(s) we could call Try(parse(s)) . If a class instance is passed for a type that could not possibly be used to catch an exception (such as String , for example), this method will complete abruptly with a Aug 14, 2019 · Reporters may be configured to show short or full stack traces via configuration parameters. you can use the intercept method to verify the exception is thrown. That means, we can write async tests in MUnit without additional configuration. sbt like so Trap and return any thrown exception that would normally cause a ScalaTest test to fail, or create and return a new RuntimeException indicating no exception is thrown. To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write: scala> (new ExampleSuite). Checking for expected exceptions . If this Suite contains no tests with tags, this method returns an empty Map . Nov 25, 2023 · In this tutorial, we’ll learn about the functionalities of assert and require. including members supporting ScalaTest's DSL for the Scala interpreter. interrupted to test that an effect was interrupted. Jan 4, 2014 · test("some test") { val f: Future[Something] = someObject. My project was based on Scala 2. The second test has result type Assertion: scala> def addNow(addends: Int*): Int = addends. Mar 2, 2017 · Trait that contains ScalaTest's basic assertion methods. Feb 7, 2019 · It lets you “intercept” (handle) the exception that’s thrown by splitCamelCase and then assign it to a variable. Intercept and return an exception that's expected to be thrown by the passed function value. The TryValues trait (documented here) is designed to help with this:. toInt Checking for expected exceptions . The success method will return the Try on which it is invoked as a Success if the Try actually is a Success , or throw TestFailedException if not. result(notification. seconds) Personally, I would recommend AsyncFlatSpec method. Trait that encapsulates the information required of an exception thrown by ScalaTest's assertions and matchers, which includes a stack depth at which the failing line of test code resides. js. Thanks! Refactor using Scala when different tests need different fixtures. Assert. DoesNotThrow(<expression>); to assert that your code does not throw an exception. ScalaTest's main traits, classes, and other members, including members supporting ScalaTest's DSL for the Scala interpreter. annotations. If you are expecting a specific exception under certain inputs, you declare it as an expected exception. Dec 7, 2021 · The following code shows that you don’t have to catch the exception as an object and then test its message. class MyTestSpec extends FlatSpec with Matchers with TryValues { "tryTest" should "succeed" in { // Normal tests test(0, 1). May 11, 2017 · Is there any convenient way execute tests on multiple data sets with ScalaTest — like in JUnit's parametrized tests? To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write: scala> (new ExampleSuite). May 9, 2019 · noException should be thrownBy Await. If you want to write JUnit 4 tests in Scala that you run with JUnit, you can enjoy more concise code by using ScalaTest's assertions and/or matchers. Jul 14, 2009 · I want to set an expected exception for a JUnit 4 test using Scala. If a class instance is passed for a type that could not possibly be used to catch an exception (such as String , for example), this method will complete abruptly with a ScalaTest Doc 3. the exception won't be thrown from your test method). 6 -- py-1. Pending; (class) PendingNothing (object) (trait) PrivateMethodTester (class) PropSpec def withClue [T] (clue: Any) (fun: ⇒ T): T. Class AnyWordSpec is so named because your specification text is structured by placing words after strings. You can also state that no exception must be thrown by some code, like this: noException must be thrownBy 0 / 1. Here are some examples: > test-only org. toInt was not greater than "8". Example: def test_div_zero(): with pytest. js represented a major, completely unforeseen change in requirements for ScalaTest. In addition to the numerous methods for verifying expected data or states, ScalaTest offers a variety of approaches to testing exceptions. One use case is to import Assertions members so you can use them in the Scala interpreter: I have a simple Java method, I would like to check that it does not throw any exceptions. For teams coming from Ruby's RSpec tool, FunSpec will feel very familiar; More generally, for any team that prefers BDD, FunSpec's nesting and gentle guide to structuring text (with describe and it) provides an excellent general-purpose choice for writing specification-style tests. isSuccess shouldBe true test(1, 1). This stack depth, provided by TestFailedException (and a few other ScalaTest exceptions), makes it quicker for Mar 28, 2018 · Because the recover() method takes a PartialFunction, it can be used to filter for the type of Throwable you want to handle. In Scala, exceptions can be caught based on traits they implement, so it may at times make sense to specify a trait that the intercepted exception's class must mix in. nonEmpty) } "A non-empty Set" should "have the correct size" in { // Describe another subject assert(Set (1, 2, 3). failure. bbjfas oesie rtfp uzhey qpqukt lulfau lhb rlcaflb lxb hski