stream migration: collapse identity matching (IDEA-122706)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/afterCollectIdentityMap.java

@@ -0,0 +1,11 @@
+// "Replace with collect" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class Collect {
+  class Person {}
+
+  void collectNames(List<Person> persons){
+    List<Person> names = persons.stream().collect(Collectors.toList());
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/beforeCollectIdentityMap.java

@@ -0,0 +1,13 @@
+// "Replace with collect" "true"
+import java.util.*;
+
+public class Collect {
+  class Person {}
+
+  void collectNames(List<Person> persons){
+    List<Person> names = new ArrayList<>();
+    for (Person person : pers<caret>ons) {
+      names.add(person);
+    }
+  }
+}