Add a few simple tests.

build.sbt

@@ -9,5 +9,6 @@ scalacOptions += "-deprecation"
 // resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"
 
 libraryDependencies ++= Seq(
-  "org.jsoup" % "jsoup" % "1.6.1"
+  "org.jsoup" % "jsoup" % "1.6.1",
+  "org.scalatest" %% "scalatest" % "1.7.1" % "test"
 )

src/test/scala/GoogleCalculatorSpec.scala

@@ -0,0 +1,14 @@
+import org.scalatest.FunSpec
+import me.elrod.GoogleCalculator._
+
+class GoogleCalculatorSpec extends FunSpec {
+  describe("The library") {
+    it("should correctly retrieve the result of 2+2") {
+      assert(GoogleCalculator.calculate("2 + 2") == "2 + 2 = 4")
+    }
+
+    it("should correctly retrieve an approximation of Pi") {
+      assert(GoogleCalculator.calculate("pi").startsWith("pi = 3.1415"))
+    }
+  }
+}