IDEA-160442 Warn about excessive use of collectors (additional test file)

java/java-tests/testData/inspection/streamApiCallChains/beforeCollectorReducing2.java

@@ -0,0 +1,10 @@
+// "Replace Stream.collect(reducing()) with Stream.reduce()" "true"
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class Main {
+  public String concat(List<String> data) {
+    return data.stream().filter(x -> x.startsWith("xyz")).colle<caret>ct(Collectors.reducing("", String::concat));
+  }
+}