fix(Functional Loops - Computing Square Root): Tests reworked

Assertions moved from the task to the test file, placeholders updated,
main method added

Closes EDC-214

Author: Geravant

Functional Loops/Computing the Square Root of a Value/src/ComputingSquareRoot.scala

@@ -1,20 +1,17 @@
-import org.scalatest.{FlatSpec, Matchers}
+object ComputingSquareRoot{
 
-object ComputingSquareRoot extends FlatSpec with Matchers {
+  def sqrt(x: Double) = sqrtIter(1.0, x)
 
-  def sqrtExample(): Unit = {
-    def sqrt(x: Double) = sqrtIter(1.0, x)
+  def sqrtIter (guess: Double, x: Double): Double =
+    if (isGoodEnough(guess, x)) guess
+    else sqrtIter(improve(guess, x), x)
 
-    def sqrtIter (guess: Double, x: Double): Double =
-      if (isGoodEnough(guess, x)) guess
-      else sqrtIter(improve(guess, x), x)
+  def improve(guess: Double, x: Double) = (guess + x/ guess) / 2
 
-    def improve(guess: Double, x: Double) = (guess + x/ guess) / 2
+  def isGoodEnough(guess: Double, x: Double) = math.abs(guess * guess - x) < 0.001
 
-    def isGoodEnough(guess: Double, x: Double) = math.abs(guess * guess - x) < 0.001
-
-    sqrt(4).round shouldBe 2
-    sqrt(36).round shouldBe 6
+  def main(args: Array[String]): Unit = {
+    println(sqrt(36))
+    println(sqrt(255))
   }
-
 }

Functional Loops/Computing the Square Root of a Value/task-info.yaml

@@ -5,11 +5,12 @@ files:
 - name: src/ComputingSquareRoot.scala
   visible: true
   placeholders:
-  - offset: 266
+  - offset: 155
     length: 5
-    placeholder_text: //TODO
-  - offset: 359
+    placeholder_text: //you can just return the guess here
+  - offset: 244
     length: 22
-    placeholder_text: //TODO
+    placeholder_text: //here we need to put an expression for evaluating a better
+      guess
 - name: test/TestSpec.scala
   visible: false

Functional Loops/Computing the Square Root of a Value/test/TestSpec.scala

@@ -1,9 +1,12 @@
-import org.scalatest.Spec
+import ComputingSquareRoot.sqrt
+import org.scalatest.Matchers
+import org.scalatest.refspec.RefSpec
 
-class Test extends Spec {
+class Test extends RefSpec with Matchers{
 
   def `check factorial`(): Unit = {
-    ComputingSquareRoot.sqrtExample()
+    sqrt(4).round shouldBe 2
+    sqrt(36).round shouldBe 6
   }
 
 }