add test framework

build.sbt

@@ -5,3 +5,7 @@ version := "0.0.1"
 mainClass in assembly := Some("com.lombardo.app.Main")
 
 scalaVersion := "2.12.1"
+
+libraryDependencies ++= Seq(
+  "org.scalatest" %% "scalatest" % "3.0.1" % "test"
+)

src/test/scala/com/lombardo/app/SampleTest.scala

@@ -0,0 +1,9 @@
+package com.lombardo.app
+
+import org.scalatest.{FlatSpec, Matchers}
+
+class SampleTest extends FlatSpec with Matchers {
+  it should "run a sample test" in {
+    7 + 9 should be(16)
+  }
+}