Test for extract method containing pattern variable (IDEA-229901)

GitOrigin-RevId: 34ca9d82a66a7c3c71420b94ca9cbcd2fff7be68

java/java-tests/testData/refactoring/extractMethod/PatternVariable.java

@@ -0,0 +1,7 @@
+class X {
+    void test(Object obj) {
+        if (obj instanceof String a) {
+            System.out.println(<selection>a.length()</selection>);
+        }
+    }
+}

java/java-tests/testData/refactoring/extractMethod/PatternVariable_after.java

@@ -0,0 +1,11 @@
+class X {
+    void test(Object obj) {
+        if (obj instanceof String a) {
+            System.out.println(newMethod(a));
+        }
+    }
+
+    private int newMethod(String a) {
+        return a.length();
+    }
+}

java/java-tests/testSrc/com/intellij/java/refactoring/ExtractMethodTest.java

@@ -940,6 +940,10 @@ public class ExtractMethodTest extends LightJavaCodeInsightTestCase {
   public void testParametrizedDuplicateExpression() throws Exception {
     doDuplicatesTest();
   }
+  
+  public void testPatternVariable() throws Exception {
+    doTestWithLanguageLevel(LanguageLevel.JDK_14_PREVIEW);
+  }
 
   public void testSuggestChangeSignatureWithChangedParameterName() throws Exception {
     configureByFile(BASE_PATH + getTestName(false) + ".java");