robolectric/robolectric

Can't assert that toast text is showing up espresso way.

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#5,091 opened on Jun 6, 2019

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help wanted

Description

Description

I had a passing test with espresso that tries to log in with invalid email, and it shows toast message, When I move it into 'test' path and it fails to pass

androidx.test.espresso.NoMatchingRootException: Matcher 'with decor view not <DecorView@1b26160[LoginActivity]>' did not match any of the following roots: [Root{application-window-token=android.view.ViewRootImpl$W@604ee46e, window-token=android.view.ViewRootImpl$W@604ee46e, has-window-focus=true, layout-params-type=1, layout-params-string=WM.LayoutParams{(0,0)(fillxfill) sim=#20 ty=1 fl=#81810100 pfl=0x20000 wanim=0x10302f6 needsMenuKey=2 colorMode=0}, decor-view-string=DecorView{id=-1, visibility=VISIBLE, width=320, height=470, has-focus=true, has-focusable=true, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, layout-params=WM.LayoutParams{(0,0)(fillxfill) sim=#20 ty=1 fl=#81810100 pfl=0x20000 wanim=0x10302f6 needsMenuKey=2 colorMode=0}, tag=null, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}}]

seems like toast might not even be showing up.

Steps to Reproduce

make toast show up, assert using

onView(withText(R.string.TOAST_STRING)).inRoot(withDecorView(not(currentActivity.window.decorView))).check(matches(isDisplayed()))

Robolectric & Android Version

Robolectric 4.3 on target sdk26

Link to a public git repo demonstrating the problem:

Contributor guide

Tech stack
javaandroid
Domain
mobiletesting
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
Android testing basicsEspresso knowledgeRobolectric fundamentals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the issue with toast display in Robolectric. The error suggests that the decor view matcher does not match any root. Look into Robolectric's implementation of `ShadowToast` and how toasts are managed in the test environment. Check if the toast window is properly attached and focused. Consider whether the test needs to wait for the toast to appear or if the window focus simulation is incorrect. Refer to the Robolectric documentation and existing tests for toast handling.