IDEA-48401 Ctrl+D should place caret on the variable name when copying a line consisting of variable declaration

java/java-tests/testSrc/com/intellij/codeInsight/DuplicateActionTest.groovy

@@ -0,0 +1,38 @@
+package com.intellij.codeInsight;
+
+
+import com.intellij.openapi.actionSystem.IdeActions
+import com.intellij.testFramework.fixtures.LightCodeInsightFixtureTestCase
+import org.jetbrains.annotations.NonNls
+
+public class DuplicateActionTest extends LightCodeInsightFixtureTestCase {
+  public void testOneLine() {
+    doTest '''xxx<caret>
+''', "txt", '''xxx
+xxx<caret>
+'''
+  }
+
+  public void testEmpty() {
+    doTest '<caret>', "txt", '\n<caret>'
+  }
+
+  private void doTest(String before, @NonNls String ext, String after) {
+    myFixture.configureByText("a." + ext, before);
+    myFixture.performEditorAction(IdeActions.ACTION_EDITOR_DUPLICATE)
+    myFixture.checkResult(after);
+  }
+
+  public void testSelectName() {
+    doTest '''
+class C {
+  void foo() {}<caret>
+}
+''', 'java', '''
+class C {
+  void foo() {}
+  void <caret>foo() {}
+}
+'''
+  }
+}