IDEA-182004 Collection.containsAll() can be simplified in certain cases

RedundantCollectionOperation: strings externalized, description fixed

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/redundantCollectionOperation/afterContainsAllSingleton.java

@@ -0,0 +1,8 @@
+// "Replace with 'contains'" "true"
+import java.util.*;
+
+class Test {
+  void test(List<String> list) {
+    list.contains("foo");
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/redundantCollectionOperation/afterSingletonContains.java

@@ -0,0 +1,8 @@
+// "Replace with 'Objects.equals'" "true"
+import java.util.*;
+
+class Test {
+  void test() {
+    final boolean ff = Objects.equals("foo", "bar");
+  }
+}

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

@@ -0,0 +1,8 @@
+// "Replace with 'contains'" "true"
+import java.util.*;
+
+class Test {
+  void test(List<String> list) {
+    list.con<caret>tainsAll(Collections.singleton("foo"));
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/redundantCollectionOperation/beforeSingletonContains.java

@@ -0,0 +1,8 @@
+// "Replace with 'Objects.equals'" "true"
+import java.util.*;
+
+class Test {
+  void test() {
+    final boolean ff = Collections.singleton("foo").contai<caret>ns("bar");
+  }
+}