Report HintCode.UNUSED_FIELD

pkg/analyzer/test/generated/resolver_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library engine.resolver_test;
 
 import 'dart:collection';
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/java_engine_io.dart';
@@ skipping 3811 matching lines @@
   } catch (exception, stackTrace) {
     print('exception at $stackTrace');
   }
 }
 print(x) {}''');
     resolve(source);
     assertErrors(source);
     verify([source]);
   }
 
+  void test_unusedField_notUsed_noReference() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+}
+''');
+    resolve(source);
+    assertErrors(source, [HintCode.UNUSED_FIELD]);
+    verify([source]);
+  }
+
+  void test_unusedField_notUsed_simpleAssignment() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+  m() {
+    _f = 1;
+  }
+}
+main(A a) {
+  a._f = 2;
+}
+''');
+    resolve(source);
+    assertErrors(source, [HintCode.UNUSED_FIELD]);
+    verify([source]);
+  }
+
+  void test_unusedField_notUsed_compoundAssign() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+  main() {
+    _f += 2;
+  }
+}''');
+    resolve(source);
+    assertErrors(source, [HintCode.UNUSED_FIELD]);
+    verify([source]);
+  }
+
+  void test_unusedField_notUsed_postfixExpr() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f = 0;
+  main() {
+    _f++;
+  }
+}''');
+    resolve(source);
+    assertErrors(source, [HintCode.UNUSED_FIELD]);
+    verify([source]);
+  }
+
+  void test_unusedField_notUsed_prefixExpr() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f = 0;
+  main() {
+    ++_f;
+  }
+}''');
+    resolve(source);
+    assertErrors(source, [HintCode.UNUSED_FIELD]);
+    verify([source]);
+  }
+
+  void test_unusedField_isUsed_argument() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f = 0;
+  main() {
+    print(++_f);
+  }
+}
+print(x) {}''');
+    resolve(source);
+    assertErrors(source);
+    verify([source]);
+  }
+
+  void test_unusedField_isUsed_reference_implicitThis() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+  main() {
+    print(_f);
+  }
+}
+print(x) {}''');
+    resolve(source);
+    assertErrors(source);
+    verify([source]);
+  }
+
+  void test_unusedField_isUsed_reference_implicitThis_expressionFunctionBody() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+  m() => _f;
+}''');
+    resolve(source);
+    assertErrors(source);
+    verify([source]);
+  }
+
+  void test_unusedField_isUsed_reference_implicitThis_subclass() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+  main() {
+    print(_f);
+  }
+}
+class B extends A {
+  int _f;
+}
+print(x) {}''');
+    resolve(source);
+    assertErrors(source);
+    verify([source]);
+  }
+
+  void test_unusedField_isUsed_reference_qualified_staticElement() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+}
+main() {
+  A a = new A();
+  print(a._f);
+}
+print(x) {}''');
+    resolve(source);
+    assertErrors(source);
+    verify([source]);
+  }
+
+  void test_unusedField_isUsed_reference_qualified_propagatedElement() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+}
+main() {
+  var a = new A();
+  print(a._f);
+}
+print(x) {}''');
+    resolve(source);
+    assertErrors(source);
+    verify([source]);
+  }
+
+  void test_unusedField_isUsed_reference_qualified_unresolved() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class A {
+  int _f;
+}
+main(a) {
+  print(a._f);
+}
+print(x) {}''');
+    resolve(source);
+    assertErrors(source);
+    verify([source]);
+  }
+
   void test_useOfVoidResult_assignmentExpression_function() {
     Source source = addSource(r'''
 void f() {}
 class A {
   n() {
     var a;
     a = f();
   }
 }''');
     resolve(source);
@@ skipping 2975 matching lines @@
   }
 }
 
 class ResolverTestCase extends EngineTestCase {
   /**
    * The analysis context used to parse the compilation units being resolved.
    */
   AnalysisContextImpl analysisContext2;
 
   /**
-   * Specifies if [assertErrors] should check for [HintCode.UNUSED_ELEMENT].
+   * Specifies if [assertErrors] should check for [HintCode.UNUSED_ELEMENT] and
+   * [HintCode.UNUSED_FIELD].
    */
   bool enableUnusedElement = false;
 
   /**
    * Specifies if [assertErrors] should check for [HintCode.UNUSED_LOCAL_VARIABLE].
    */
   bool enableUnusedLocalVariable = false;
 
   @override
   void setUp() {
@@ skipping 30 matching lines @@
    *
    * @param source the source against which the errors should have been reported
    * @param expectedErrorCodes the error codes of the errors that should have been reported
    * @throws AnalysisException if the reported errors could not be computed
    * @throws AssertionFailedError if a different number of errors have been reported than were
    *           expected
    */
   void assertErrors(Source source, [List<ErrorCode> expectedErrorCodes = ErrorCode.EMPTY_LIST]) {
     GatheringErrorListener errorListener = new GatheringErrorListener();
     for (AnalysisError error in analysisContext2.computeErrors(source)) {
-      if (error.errorCode == HintCode.UNUSED_ELEMENT &&
-          !enableUnusedElement) {
+      ErrorCode errorCode = error.errorCode;
+      if (!enableUnusedElement &&
+          (errorCode == HintCode.UNUSED_ELEMENT || errorCode == HintCode.UNUSED_FIELD)) {
         continue;
       }
-      if (error.errorCode == HintCode.UNUSED_LOCAL_VARIABLE &&
-          !enableUnusedLocalVariable) {
+      if (!enableUnusedLocalVariable &&
+          errorCode == HintCode.UNUSED_LOCAL_VARIABLE) {
         continue;
       }
       errorListener.onError(error);
     }
     errorListener.assertErrorsWithCodes(expectedErrorCodes);
   }
 
   /**
    * Assert that no errors have been reported against the given source.
    *
@@ skipping 5360 matching lines @@
   runReflectiveTests(TypeResolverVisitorTest);
   runReflectiveTests(CheckedModeCompileTimeErrorCodeTest);
   runReflectiveTests(ErrorResolverTest);
   runReflectiveTests(HintCodeTest);
   runReflectiveTests(MemberMapTest);
   runReflectiveTests(NonHintCodeTest);
   runReflectiveTests(SimpleResolverTest);
   runReflectiveTests(StrictModeTest);
   runReflectiveTests(TypePropagationTest);
 }