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If your assertion tests if the arguments of a method are correct, you should use require(condition) instead. require works exactly like assert, but throws an May 18, 2020 Use the FunSpec ScalaTest class, generally with describe , and assert tests in it and they methods. There are many FunSpec examples at doc. Jul 1, 2015 Scala provides a set of preconditions functions (assert, assume, require, ensuring ). In addition to the actual functionality of dynamically check The assert macro If the passed expression is true , assert will return normally.

在任何Scala程序中，您可以通过调用assert和传递Boolean表达式来编写断言，例如： val left = 2 val right = 1 assert（left == right）如果传递的表达式是true，assert将正常返回。如果false，Scala assert将会突然完成AssertionError。 Scala中的require和assert. require和assert都用于在运行时执行某些检查来验证某些条件。那么他们的差别是什么呢？ assert意味着你的程序已经达到了不一致的状态，这可能是目前的方法/函数的一个问题（我喜欢把它想成HTTP 500 InternalServerError） Lets say you have simple class that is using the Scala assert method: class Example { def test = { assert( (1+1) == 2, "Addition broken") } } When you enable the jvmassert compiler plugin, it will translate the previous example to: At the end of each test you should call assert to test that a condition has been satisfied; Using ScalaTest like this is similar to JUnit, so if you’re coming to Scala from Java, hopefully this looks very familiar. Now you can run these tests with the sbt test command. Skipping the first few lines of output, the result looks like this: 2019-03-01 · GitHub Gist: instantly share code, notes, and snippets. Se hela listan på docs.scala-lang.org $ scala -cp scalatest-3.2.7.jar org.scalatest.run ExampleSuite Run starting.

scala> import org.scalatest.matchers.should.Matchers._ import org.scalatest.matchers.should.Matchers._ scala> List.empty shouldBe empty scala> None shouldBe empty scala> Some(1) should not be empty scala> "" shouldBe empty scala> new java.util.HashMap[Int, Int] shouldBe empty scala> new { def isEmpty = true} shouldBe empty scala> Array(1, 2, 3) should not be empty

We can also call the method + with the dot notation and it would give the same result: assert(1.+(2) == 3) Any method in Scala can be used as an operator. The following examples show how to use org.junit.Assert.assertEquals.These examples are extracted from open source projects.

2021-04-01 · Note that Scala-Native support, like Scala-Native, is experimental. While it is tested in a few projects (uTest's own test suite runs in Scala-Native), it does have it's own quirks (e.g. NullPointerExceptions appear to be fatal) and does not have the weight of third-party usage that the Scala-JVM and Scala.js versions of uTest have.

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Assert that an Option[String] is None.If the condition is None, this method returns normally.Else, it throws TestFailedException with the String value of the Some included in the TestFailedException's detail message.. This form of assert is usually called in conjunction with an implicit conversion to Equalizer, using a === comparison, as in:.
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assert statements can be elided at runtime by providing the command line argument -Xdisable-assertions to the scala command. Variants of assert intended for use with static analysis tools are also provided: assume, require and ensuring. 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. If false, assert will complete abruptly with an AssertionError.

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If your assertion tests if the arguments of a method are correct, you should use require(condition) instead. require works exactly like assert, but throws an

2019-03-01 2019-02-28 Scala's exceptions work like exceptions in many other languages like Java. Instead of returning a value in the normal way, a method can terminate by throwing an exception. However, Scala doesn't actually have checked exceptions.