我正在嘗試使用Robolectric來測試NFC輔助類。簡化的,我在做這樣的事情:使用Robolectric的ShadowNfcAdapter來單元測試NFC輔助類
Activity activity = Robolectric.buildActivity(Activity.class)
.create()
.start()
.resume()
.get();
NfcAdapter nfcAdapter = ShadowNfcAdapter.getNfcAdapter(activity);
,然後行使我的NFC輔助類,因爲它確實是這樣的:
if (!nfcAdapter.isEnabled()){
//more stuff
}
但是,調用nfcAdapter.isEnabled()
導致空指針異常。
java.lang.NullPointerException
at android.nfc.NfcAdapter.isEnabled(NfcAdapter.java:621)
at <package>.test_NfcIntent_shouldPostToBus(NfcHelperTest.java:49)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:251)
at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:188)
at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:54)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:152)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
例外看起來是從Android的NfcAdapter.java
public boolean isEnabled() {
try {
return sService.getState() == STATE_ON;
} catch (RemoteException e) {
attemptDeadServiceRecovery(e);
return false;
}
}
來這裏sService
爲空。實際上,當我使用調試器時,我可以看到nfcAdapter
的字段都是null或者它們本身具有空字段的對象。
這是正確的使用方法ShadowNfcAdapter
?或者,測試NFC輔助類在被觸發時是否做正確的事情的正確方法是什麼?
https://github.com/robolectric/robolectric/pull/2088解決#2059。因此,使用robolectric 3.0或更高版本,它應該工作。 –