openide/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/redundantCollectionOperation/beforeContainsAllSingleton.java

// "Replace with 'contains'" "true"
import java.util.*;

class Test {
  void test(List<String> list) {
    list.con<caret>tainsAll(Collections.singleton("foo"));
  }
}