Java: Extract method from similar expressions by introducing a parameter (IDEA-179924, IDEA-180107)

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

@@ -0,0 +1,4 @@
+public class C {
+    String f1 = <selection>"a" + "b"</selection>;
+    String f2 = "c" + "b";
+}

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

@@ -0,0 +1,12 @@
+import org.jetbrains.annotations.NotNull;
+
+public class C {
+    String f1 = newMethod("a");
+
+    @NotNull
+    private String newMethod(String a) {
+        return a + "b";
+    }
+
+    String f2 = newMethod("c");
+}

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

@@ -839,6 +839,10 @@ public class ExtractMethodTest extends LightCodeInsightTestCase {
     doDuplicatesTest();
   }
 
+  public void testSuggestChangeSignatureTwoFieldInitializers() throws Exception {
+    doDuplicatesTest();
+  }
+
   public void testSuggestChangeSignatureWithChangedParameterName() throws Exception {
     configureByFile(BASE_PATH + getTestName(false) + ".java");
     boolean success = performExtractMethod(true, true, getEditor(), getFile(), getProject(), false, null, false, "p");