introduce constant: create subclass when it is not possible to place the constant inside the class (IDEA-86965)

java/java-tests/testData/refactoring/introduceConstant/FromEnumConstantInitializer.java

@@ -0,0 +1,6 @@
+enum TestEnum {
+  ONE("te<caret>stString");
+
+  TestEnum(String str) {
+  }
+}

java/java-tests/testData/refactoring/introduceConstant/FromEnumConstantInitializer_after.java

@@ -0,0 +1,10 @@
+enum TestEnum {
+  ONE(Constants.xxx);
+
+  TestEnum(String str) {
+  }
+
+    private class Constants {
+        public static final String xxx = "testString";
+    }
+}

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

@@ -34,6 +34,12 @@ public class IntroduceConstantTest extends LightCodeInsightTestCase {
     checkResultByFile(BASE_PATH + getTestName(false) + "_after.java");
   }
 
+  public void testFromEnumConstantInitializer() throws Exception {
+    configureByFile(BASE_PATH + getTestName(false) + ".java");
+    new MockIntroduceConstantHandler(null).invoke(getProject(), getEditor(), getFile(), null);
+    checkResultByFile(BASE_PATH + getTestName(false) + "_after.java");
+  }
+
   public void testEnumConstant() throws Exception {
     doTest(true);    
   }