Added Scalatest specs for ExtensionFunctions and ImplicitMethods

SpelHelper.iml

@@ -17,10 +17,12 @@
     <output-test url="file://$MODULE_DIR$/target/test-classes" />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/target/generated-sources/annotations" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/target/generated-sources/test-annotations" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
       <sourceFolder url="file://$MODULE_DIR$/src/test/scala" isTestSource="true" />
       <excludeFolder url="file://$MODULE_DIR$/target/classes" />
+      <excludeFolder url="file://$MODULE_DIR$/target/site" />
       <excludeFolder url="file://$MODULE_DIR$/target/surefire-reports" />
       <excludeFolder url="file://$MODULE_DIR$/target/test-classes" />
     </content>

src/main/java/net/abhinavsarkar/spelhelper/ImplicitMethodResolver.java

@@ -87,7 +87,7 @@ final class ImplicitMethodResolver implements MethodResolver {
                                     newArgumentTypes);
                     MethodExecutor wrappedExecutor = executor == null ? null
                             : new ImplicitMethodExecutor(executor);
-                    if(wrappedExecutor == null) {
+                    if (wrappedExecutor == null) {
                         CACHE.putIfAbsent(cacheKey, NULL_ME);
                     }
                     return wrappedExecutor;

src/test/scala/net/abhinavsarkar/spelhelper/ExtensionFunctionsSpec.scala

@@ -0,0 +1,35 @@
+package net.abhinavsarkar.spelhelper
+
+import org.scalatest.junit.JUnitRunner
+import org.junit.runner.RunWith
+import org.scalatest.FlatSpec
+import org.scalatest.junit.ShouldMatchersForJUnit
+import java.util.{Set => JSet, HashSet,
+  List => JList, ArrayList,
+  Map => JMap, HashMap}
+
+@RunWith(classOf[JUnitRunner])
+class ExtensionFunctionsSpec extends FlatSpec with ShouldMatchersForJUnit {
+
+  "Extension Function 'list'" should "return a java.util.List " in {
+    val list: JList[String] = new ArrayList
+    List("a", "b", "c") foreach { list add _ }
+    new SpelHelper().evalExpression("#list('a','b','c')",
+      new {}, classOf[JList[String]]) should equal(list)
+  }
+
+  "Extension Function 'set'" should "return a java.util.Set " in {
+    val set: JSet[String] = new HashSet
+    List("a", "b", "c") foreach { set add _ }
+    new SpelHelper().evalExpression("#set('a','b','c')",
+      new {}, classOf[JSet[String]]) should equal(set)
+  }
+
+  "Extension Function 'map'" should "return a java.util.Map " in {
+    val map: JMap[String,Int] = new HashMap
+    List("a", "b", "c").zipWithIndex.foreach { x => map.put(x._1, x._2) }
+    new SpelHelper().evalExpression("#map(#list('a','b','c'),#list(0,1,2))",
+      new {}, classOf[JMap[String,Int]]) should equal(map)
+  }
+
+}

src/test/scala/net/abhinavsarkar/spelhelper/ImplicitMethodsSpec.scala

@@ -0,0 +1,52 @@
+package net.abhinavsarkar.spelhelper
+
+import org.scalatest.junit.JUnitRunner
+import org.junit.runner.RunWith
+import org.scalatest.FlatSpec
+import org.scalatest.junit.ShouldMatchersForJUnit
+import java.util.{HashSet, Set => JSet, List => JList, ArrayList}
+
+@RunWith(classOf[JUnitRunner])
+class ImplicitMethodsSpec extends FlatSpec with ShouldMatchersForJUnit {
+
+  "Implicit Function 'distinct' on List" should
+      "return distinct items in a list " in {
+    val set: JSet[String] = new HashSet
+    set add "a"; set add "b"
+    new SpelHelper().evalExpression("#list('a','b','a').distinct()",
+      new {}, classOf[JSet[String]]) should equal(set)
+  }
+
+  "Implicit Function 'sorted' on List" should
+      "return a sorted list " in {
+    val list: JList[String] = new ArrayList
+    List("a", "b", "c") foreach { list add _ }
+    new SpelHelper().evalExpression("#list('c','b','a').sorted()",
+      new {}, classOf[JList[String]]) should equal(list)
+  }
+
+  "Implicit Function 'reversed' on List" should
+      "return a reversed list " in {
+    val list: JList[String] = new ArrayList
+    List("a", "b", "c") foreach { list add _ }
+    new SpelHelper().evalExpression("#list('c','b','a').reversed()",
+      new {}, classOf[JList[String]]) should equal(list)
+  }
+
+  "Implicit Function 'take' on List" should
+      "return a list containing first n items of a list " in {
+    val list: JList[String] = new ArrayList
+    List("a", "b", "c") foreach { list add _ }
+    new SpelHelper().evalExpression("#list('a','b','c','d').take(3)",
+      new {}, classOf[JList[String]]) should equal(list)
+  }
+
+  "Implicit Function 'drop' on List" should
+      "return a list containing items after the first n items of a list " in {
+    val list: JList[String] = new ArrayList
+    List("c", "d") foreach { list add _ }
+    new SpelHelper().evalExpression("#list('a','b','c','d').drop(2)",
+      new {}, classOf[JList[String]]) should equal(list)
+  }
+  
+}