type migration: to void: remove unused variables in simple cases IDEA-158196

java/typeMigration/test/com/intellij/refactoring/TypeMigrationTest.java

@@ -846,6 +846,22 @@ public class TypeMigrationTest extends TypeMigrationTestBase {
     doTestFieldsType("Test", myFactory.createTypeFromText(CommonClassNames.JAVA_LANG_OBJECT, null), "a", "b");
   }
 
+  public void testVoidMigrationInVarDecl() {
+    doTestMethodType("migrationMethod", PsiType.VOID);
+  }
+
+  public void testVoidMigrationInVarDeclFailed() {
+    doTestMethodType("migrationMethod", PsiType.VOID);
+  }
+
+  public void testVoidMigrationInAssignment() {
+    doTestMethodType("migrationMethod", PsiType.VOID);
+  }
+
+  public void testVoidMigrationInAssignmentFailed() {
+    doTestMethodType("migrationMethod", PsiType.VOID);
+  }
+
   private void doTestReturnType(final String methodName, final String migrationType) {
     start(new RulesProvider() {
       @Override

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInAssignment/after/Test.items

@@ -0,0 +1,10 @@
+Types:
+PsiMethod:migrationMethod : void
+PsiMethodCallExpression:migrationMethod() : void
+
+Conversions:
+"" -> $
+migrationMethod() -> $
+
+New expression type changes:
+Fails:

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInAssignment/after/test.java

@@ -0,0 +1,11 @@
+class Test {
+
+  static void migrationMethod() {
+  }
+
+  void m() {
+    String sss;
+    migrationMethod();
+    sss = "";
+  }
+}

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInAssignment/before/test.java

@@ -0,0 +1,12 @@
+class Test {
+
+  static String migrationMethod() {
+    return "";
+  }
+
+  void m() {
+    String sss;
+    sss = migrationMethod();
+    sss = "";
+  }
+}

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInAssignmentFailed/after/Test.items

@@ -0,0 +1,10 @@
+Types:
+PsiMethod:migrationMethod : void
+PsiMethodCallExpression:migrationMethod() : void
+
+Conversions:
+"" -> $
+
+New expression type changes:
+Fails:
+migrationMethod()->void

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInAssignmentFailed/after/test.java

@@ -0,0 +1,12 @@
+class Test {
+
+  static void migrationMethod() {
+  }
+
+  void m() {
+    String sss;
+    sss = migrationMethod();
+    System.out.println(sss);
+    sss = "";
+  }
+}

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInAssignmentFailed/before/test.java

@@ -0,0 +1,13 @@
+class Test {
+
+  static String migrationMethod() {
+    return "";
+  }
+
+  void m() {
+    String sss;
+    sss = migrationMethod();
+    System.out.println(sss);
+    sss = "";
+  }
+}

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInVarDecl/after/Test.items

@@ -0,0 +1,10 @@
+Types:
+PsiMethod:migrationMethod : void
+PsiMethodCallExpression:migrationMethod() : void
+
+Conversions:
+"" -> $
+migrationMethod() -> $
+
+New expression type changes:
+Fails:

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInVarDecl/after/test.java

@@ -0,0 +1,12 @@
+class Test {
+
+  static void migrationMethod() {
+  }
+
+  void m() {
+    String sss;
+      migrationMethod();
+      sss = "";
+    System.out.println(sss);
+  }
+}

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInVarDecl/before/test.java

@@ -0,0 +1,12 @@
+class Test {
+
+  static String migrationMethod() {
+    return "";
+  }
+
+  void m() {
+    String sss = migrationMethod();
+    sss = "";
+    System.out.println(sss);
+  }
+}

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInVarDeclFailed/after/Test.items

@@ -0,0 +1,10 @@
+Types:
+PsiMethod:migrationMethod : void
+PsiMethodCallExpression:migrationMethod() : void
+
+Conversions:
+"" -> $
+
+New expression type changes:
+Fails:
+migrationMethod()->void

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInVarDeclFailed/after/test.java

@@ -0,0 +1,10 @@
+class Test {
+
+  static void migrationMethod() {
+  }
+
+  void m() {
+    String sss = migrationMethod();
+    System.out.println(sss);
+  }
+}

java/typeMigration/testData/refactoring/typeMigration/voidMigrationInVarDeclFailed/before/test.java

@@ -0,0 +1,11 @@
+class Test {
+
+  static String migrationMethod() {
+    return "";
+  }
+
+  void m() {
+    String sss = migrationMethod();
+    System.out.println(sss);
+  }
+}