android中ProgressDialog的Robolectric测试

Question

I have 2 methods

public void showProgress() {
    progressDialog = ProgressDialog.show(LoanDemandDetails.this, "", resourceUtil.getLabelById(R.string.uploading_loan_demand), true, false);
}

and

public void onHideProgressDialog() {
    progressDialog.hide();
}

I want to test these functions using Robolectric.

I've written a test case for showProgress and it passed which looks like the following.

@Test
public void showProgressDialog() {
    activity.showProgress();

    ProgressDialog dialog = (ProgressDialog) ShadowProgressDialog.getLatestDialog();

    assertEquals("Uploading Loan Demand...", shadowOf(dialog).getMessage());
}

Similarly, when I write a test case for hideProgressDialog , it fails.

@Test
public void hideProgressDialog(){
    activity.showProgress();

    activity.onHideProgressDialog();
    ProgressDialog dialog1 = (ProgressDialog) ShadowProgressDialog.getLatestDialog();
    assertFalse(dialog1.isShowing());
}

Any idea? Thanks in advance!

Answer 1

It looks like, the code that checks the dialog is showing or not is being executed too fast before the dialog is actually being hidden. I would like to suggest adding an intentional Thread.sleep between the executions as follows.

@Test
public void hideProgressDialog() throws Exception {
    activity.showProgress();
    activity.onHideProgressDialog();

    // Introduce some intentional delay here
    Thread.sleep(2000); // 2 seconds delay added 

    // Now check if the tests are passing. 
    ProgressDialog dialog1 = (ProgressDialog) ShadowProgressDialog.getLatestDialog();
    assertFalse(dialog1.isShowing());
}

If you are using RxJava, you can use TestScheduler to do this in a graceful way instead of having a Thread.sleep in your test code.