我正在嘗試針對一個類編寫單元測試。我無法更改課程，但我認為可以使用反射進行測試。我只是不知道該怎么做。這是課程：public class MyClass extends AnotherClass implements TheInterface{ private enum SomeTypes { SAMPLE01, SAMPLE02, SAMPLE03 } private CircularList<SomeTypes> someTypesList; Date date= new Date(); private SomeOtherClassProcessor01 someOtherClassProcessor01; private SomeOtherClassProcessor02 someOtherClassProcessor02; private SomeOtherClassProcessor03 someOtherClassProcessor03; public Properties initialize (Properties properties) throws Exception { Properties propertiesToReturn = super.initialize(properties); someTypesList = new CircularList<SomeTypes> (Arrays.asList(SomeTypes.values())); someOtherClassProcessor01 = new SomeOtherClassProcessor01(); someOtherClassProcessor02 = new SomeOtherClassProcessor02(); someOtherClassProcessor03 = new SomeOtherClassProcessor03(); return propertiesToReturn; } @Override public void get(ImportedClass someParams) throws Exception { SomeTypes types = someTypesList.getFirstAndRotate(); switch(types) { case SAMPLE01: someOtherClassProcessor01.doSomething(someParams, date); break; case SAMPLE02: someOtherClassProcessor02.doSomething(someParams, date); break; case SAMPLE03: someOtherClassProcessor03.doSomething(someParams, date); break; default: throw new IllegalArgumentException("This " + types + " was not implemented."); } } }是否可以為此使用白盒？我需要確保在這些對象的 getter 中有一個調(diào)用。我應該嘗試 when(someOtherClassProcessor01.doSomething(any(), date)).thenReturn(true) 之類的東西嗎？如果您需要更多詳細信息，請告訴我。
1 回答
尚方寶劍之說
TA貢獻1788條經(jīng)驗 獲得超4個贊
一種選擇是將您自己的（模擬的）實現(xiàn)替換SomeOtherClassProcessor為MyClass使用反射：
MyClass myClass = new MyClass();
SomeOtherProcessor01 mockProcessor01 = mock(SomeOtherProcessor01.class);
// reflection bit: find the field by its name
// handle NoSuchFieldException
Field someProcessorField = MyClass.getDeclaredField("someOtherProcessor01");
// the field is declared as private, so make it accessible in order to work with it
someProcessorField.setAccessible(true);
// now set your mocked processor into the field.
// First argument is the object to change; second argument - new value for the field
someProcessorField.set(myClass, mockProcessor01);
附言。使用 PowerMock 和/或反射是向糟糕的設(shè)計投降（根據(jù) Timothy :)。您不應該依賴尚未經(jīng)過充分測試的代碼，如果是，您不應該再次嘗試對其進行測試。假設(shè)您的測試實際上揭示了一個錯誤——如果您不控制代碼，您將如何修復它？假設(shè) Java 11 變成了一個東西，禁止你使用反射。假設(shè)您正在測試的代碼發(fā)生變化并且字段被重命名 - 通過反射，您沒有編譯時安全......潛在問題列表繼續(xù)
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