Fix exercise

Author: Alejandro Gómez

src/main/scala/stdlib/Asserts.scala

@@ -44,9 +44,8 @@ object Asserts extends FlatSpec with Matchers with exercise.Section {
 
   /** Booleans in asserts can test equality.
     */
-  def booleansAsserts(res0: String) {
+  def booleanAsserts(res0: Int) {
     val v1 = 4
-    val v2 = 4
     v1 === res0
 
     /** `===` is an assert. It is from ScalaTest, not from the Scala language. */

src/test/scala/exercises/stdlib/AssertsSpec.scala

@@ -13,8 +13,9 @@ class AssertsSpec extends Spec with Checkers {
     check(Test.testSuccess(Asserts.scalaTestAsserts _, true :: HNil))
   }
 
-  // FIXME: depends on #259
-  // check(testSuccess(Asserts.booleansAsserts _, HNil))
+  def `boolean asserts` = {
+    check(Test.testSuccess(Asserts.booleanAsserts _, 4 :: HNil))
+  }
 
   def `values asserts` = {
     check(Test.testSuccess(Asserts.valuesAsserts _, 2 :: HNil))