StreamApiMigration: support joining with prefix and suffix

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

@@ -0,0 +1,11 @@
+// "Replace with collect" "true"
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class Test {
+  static String test(List<String> list) {
+      String sb = list.stream().filter(s -> !s.isEmpty()).collect(Collectors.joining(",", "[", "]"));
+      return sb.trim();
+  }
+}

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

@@ -0,0 +1,11 @@
+// "Replace with collect" "true"
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class Test {
+  static String test(List<String> list) {
+      String sb = list.stream().filter(s -> !s.isEmpty()).collect(Collectors.joining("", "initial", ""));
+      return sb.trim();
+  }
+}

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

@@ -0,0 +1,13 @@
+// "Replace with collect" "true"
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class Test {
+  static String test(List<String> list) {
+    String sb;
+    System.out.println("hello");
+      sb = list.stream().filter(s -> !s.isEmpty()).collect(Collectors.joining("", "", "xyz"));
+      return sb;
+  }
+}

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

@@ -0,0 +1,16 @@
+// "Replace with collect" "true"
+
+import java.util.List;
+
+public class Test {
+  static String test(List<String> list) {
+    StringBuilder sb = new StringBuilder("[");
+    for (String s : li<caret>st) {
+      if (!s.isEmpty()) {
+        if(sb.length() > 0) sb.append(',');
+        sb.append(s);
+      }
+    }
+    return sb.append("]").toString().trim();
+  }
+}

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

@@ -1,10 +1,9 @@
-// "Replace with collect" "false"
+// "Replace with collect" "true"
 
 import java.util.List;
 
 public class Test {
   static String test(List<String> list) {
-    // Not supported for now
     StringBuilder sb = new StringBuilder("initial");
     for (String s : li<caret>st) {
       if (!s.isEmpty()) {

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

@@ -1,4 +1,4 @@
-// "Replace with collect" "false"
+// "Replace with collect" "true"
 
 import java.util.List;