如何用自定义 class 覆盖 Robolectric 标准阴影 class？

Question

我正在编写一个连接低功耗蓝牙设备的简单应用程序。连接到设备的代码位于 HandlerThread 上，因此，为了使处理程序线程在我使用的单元测试中工作 robolectric.

使用robolectric后，handler线程运行正常，但又出现了另一个问题。

Robolectric 不允许我模拟 BluetoothDevice class 因为 robolectric ShadowBluetoothDevice class 不包含该方法 connectGatt(...)。所以，在运行时我得到错误：

java.lang.NoSuchMethodError: android.bluetooth.BluetoothDevice.connectGatt(Landroid/content/Context;ZLandroid/bluetooth/BluetoothGattCallback;)Landroid/bluetooth/BluetoothGatt;

at com.example.BLEGattTest.setup(BLEGattTest.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod.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.RunBefores.evaluate(RunBefores.java:24)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.robolectric.RobolectricTestRunner.evaluate(RobolectricTestRunner.java:250)
at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:176)
at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:49)
at org.junit.runners.ParentRunner.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access[=13=]0(ParentRunner.java:58)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)
at org.robolectric.RobolectricTestRunner.evaluate(RobolectricTestRunner.java:142)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

所以，我在想，如果我可以重写 ShadowBluetoothDevice，我真的可以做到这一点吗？

我的代码：

@RunWith(RobolectricTestRunner.class)
@Config(manifest = Config.NONE)
    public class BLEGattTest {

        private BLEGattScanner scanner;

        private Customer customer;

        private BluetoothDevice device;

        @Before
        public void setup(){

            customer = new Customer();
            customer.setDevice(device);

            device = Mockito.mock(BluetoothDevice.class);
            when(device.connectGatt(any(Context.class), anyBoolean(), any(BluetoothGattCallback.class))).thenReturn(null);

            scanner = new BLEGattScanner(RuntimeEnvironment.application);
            scanner.start();
        }

        @After
        public void tearDown() throws InterruptedException {
            if(scanner != null){
                scanner.stopThread();
                scanner.join(1000);
            }
        }

        @Test
        public void testMocks(){
            Assert.assertEquals("asdf", device.getName());
        }
    }

Answer 1

您添加设备，然后模拟它。那行不通-您需要模拟它然后设置设备。

在 customer.setDevice(device) 时，设备未定义。

如何用自定义 class 覆盖 Robolectric 标准阴影 class？

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nosuchmethoderror