Added tests

#KT-6179 Fixed
  #KT-8132 Fixed

idea/idea-completion/testData/handlers/smart/kt6179filterTo.kt

@@ -0,0 +1,10 @@
+import java.util.ArrayList
+
+fun foo(c: Collection<String>) {
+    val list = ArrayList<String>()
+    c.filterTo0(<caret>)
+}
+
+fun <T, C : MutableCollection<in T>> Iterable<T>.filterTo0(destination: C, predicate: (T) -> Boolean): C = destination
+
+//ELEMENT: list

idea/idea-completion/testData/handlers/smart/kt6179filterTo.kt.after

@@ -0,0 +1,10 @@
+import java.util.ArrayList
+
+fun foo(c: Collection<String>) {
+    val list = ArrayList<String>()
+    c.filterTo0(list)
+}
+
+fun <T, C : MutableCollection<in T>> Iterable<T>.filterTo0(destination: C, predicate: (T) -> Boolean): C = destination
+
+//ELEMENT: list

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/handlers/SmartCompletionHandlerTestGenerated.java

@@ -443,6 +443,12 @@ public class SmartCompletionHandlerTestGenerated extends AbstractSmartCompletion
         doTest(fileName);
     }
 
+    @TestMetadata("kt6179filterTo.kt")
+    public void testKt6179filterTo() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/handlers/smart/kt6179filterTo.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("Lambda1.kt")
     public void testLambda1() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/handlers/smart/Lambda1.kt");