Using ScalaCheck for property-based testing

In this section, we will cover the following topics:

• Property-based testing
• Creating a property-based test

Let's look at a simple property-based test. We need to import a dependency before we define properties. We also need a dependency for the ScalaCheck library, which is a library for property-based tests.

In the previous section, every test extended FunSuite. We used functional tests, but we had to provide arguments explicitly. In this example, we're extending Properties from the ScalaCheck library and testing a StringType, as follows:

object PropertyBasedTesting extends Properties("StringType")

Our ScalaCheck will generate a random string for us. If we create a property-based test for a custom type, then that is not known to the ScalaCheck. We need to provide a generator that will generate instances of that...