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Add a test for restoring compose content

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Alex Gabor 2022-04-04 18:16:06 +03:00
parent 2e97716b48
commit 47037d4bcd
3 changed files with 73 additions and 3 deletions
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codekata/compose.instructionset.md
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@ -324,3 +324,31 @@ robot.assertErrorIsShown(R.string.something_went_wrong)
.assertNotLoading()
navigationRobot.assertAuthScreen()
```
### 6. `restoringContentShowPreviousCredentials`
Since we're writing apps for Android, we must handle state restoration so let's write a test for it.
For simulating the recreation of the UI, we first need a `StateRestorationTester`:
```kotlin
private val stateRestorationTester = StateRestorationTester(composeTestRule)
```
Then in `setup()`, we need to `setContent` on `stateRestorationTester` instead of on `composeTestRule`.
Now for the actual test, we first setup the content then we trigger restoration by calling `stateRestorationTester.emulateSavedInstanceStateRestore()`, afterwards we can verify that the content is recreated in the correct way:
```kotlin
composeTestRule.mainClock.advanceTimeUntil { anyResourceIdling() }
navigationRobot.assertAuthScreen()
robot.setUsername("alma")
.setPassword("banan")
.assertUsername("alma")
.assertPassword("banan")
stateRestorationTester.emulateSavedInstanceStateRestore()
navigationRobot.assertAuthScreen()
robot.assertUsername("alma")
.assertPassword("banan")
```