How to write scalatest unit test for scala object?

Question

I am trying to write a unit test for scala object with using scalatest but. I imported the following dependencies for my sbt;

libraryDependencies += "org.scalactic" %% "scalactic" % "3.0.5" libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.5" % "test"

How to write the test case for this code?

object Word {

  def readFile(): Map[String, Int] = {
    val counter = scala.io.Source.fromFile("filepath")
      .getLines.flatMap(_.split("\\W+"))
      .foldLeft(Map.empty[String, Int]) {
        (count, word) =>
          count + (word ->
            (count.getOrElse(word, 0) + 1))
      }
    counter
  }
}

Answer 1

There are many ways to write test for it. There are libraries like FlatSpec, FunSuit. So here, i am going to write test case for it using FunSuit

import org.scalatest.FunSuite

class WordTest extends FunSuite {

  test("should return word count ") {
    val wordCount = Word.readFile()

    assert(wordCount.nonEmpty)
  }
}