Question

我正在测试单元测试以进行登录，但是当我尝试获取该类的上下文时出现错误。

代码：

@Test
    public void testLogin()
    {
        Context context = Mockito.mock(Context.class);
        SessionManager ses=new SessionManager(context);// There I got null pointer exception
        hash=ses.getUserDetails();
        testName=hash.get(SessionManager.KEY_USERNAME);
        testPass=hash.get(SessionManager.KEY_PASSWORD);
    }

LogcatError：

java.lang.NullPointerException
    at com.mvp.Sharedprefernce.SessionManager.<init>(SessionManager.java:41)
    at app.test.contest.mvp.LoginUnitTest.testLogin(LoginUnitTest.java:61)
    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$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.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    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.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
    at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
    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)

任何人都可以解决这个问题。

先谢谢。

Answer 1

这是单元测试的问题。在模拟对象时，你必须模拟这个模拟的所有交互（它也是方法）。上下文是一个非常大的对象，因此你必须寻找它所做的事情。

在SessionManager.java:41行中Context，Mockito禁止使用public int getOrientation(String imagePath) { ExifInterface exif = null; try { exif = new ExifInterface(path); } catch (IOException e) { e.printStackTrace(); } int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,ExifInterface.ORIENTATION_UNDEFINED); return orientation; } public static Bitmap rotateBitmap(Bitmap bitmap, int orientation) { Matrix matrix = new Matrix(); switch (orientation) { case ExifInterface.ORIENTATION_NORMAL: return bitmap; case ExifInterface.ORIENTATION_FLIP_HORIZONTAL: matrix.setScale(-1, 1); break; case ExifInterface.ORIENTATION_ROTATE_180: matrix.setRotate(180); break; case ExifInterface.ORIENTATION_FLIP_VERTICAL: matrix.setRotate(180); matrix.postScale(-1, 1); break; case ExifInterface.ORIENTATION_TRANSPOSE: matrix.setRotate(90); matrix.postScale(-1, 1); break; case ExifInterface.ORIENTATION_ROTATE_90: matrix.setRotate(90); break; case ExifInterface.ORIENTATION_TRANSVERSE: matrix.setRotate(-90); matrix.postScale(-1, 1); break; case ExifInterface.ORIENTATION_ROTATE_270: matrix.setRotate(-90); break; default: return bitmap; } try { Bitmap bmRotated = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); bitmap.recycle(); return bmRotated; } catch (OutOfMemoryError e) { e.printStackTrace(); return null; } }。试着在那里寻找答案。

如何从android中的Unit Test获取上下文

1 个答案: