Scala Language Testing with ScalaTest Spec Test Cheatsheet
Example
Setup
The tests below uses these values for the examples.
val helloWorld = "Hello World"
val helloWorldCount = 1
val helloWorldList = List("Hello World", "Bonjour Le Monde")
def sayHello = throw new IllegalStateException("Hello World Exception")
Type check
To verify the type for a given val:
helloWorld shouldBe a [String]
Note that the brackets here are used to get type String.
Equal check
To test equality:
helloWorld shouldEqual "Hello World"
helloWorld should === ("Hello World")
helloWorldCount shouldEqual 1
helloWorldCount shouldBe 1
helloWorldList shouldEqual List("Hello World", "Bonjour Le Monde")
helloWorldList === List("Hello World", "Bonjour Le Monde")
Not Equal check
To test inequality:
helloWorld should not equal "Hello"
helloWorld !== "Hello"
helloWorldCount should not be 5
helloWorldList should not equal List("Hello World")
helloWorldList !== List("Hello World")
helloWorldList should not be empty
Length check
To verify length and/or size:
helloWorld should have length 11
helloWorldList should have size 2
Exceptions check
To verify the type and message of an exception:
val exception = the [java.lang.IllegalStateException] thrownBy {
sayHello
}
exception.getClass shouldEqual classOf[java.lang.IllegalStateException]
exception.getMessage should include ("Hello World")
