[UITest] Android UI Tests are unstable

[jeromelaban]

Current behavior

Android UI Tests fail randomly in PRs, giving this output on the device:

07-17 19:47:47.641  5730  5730 I mono-stdout: Initiate Running Test UITests.Shared.Windows_UI_Xaml_Controls.RadioButtonTests.RadioButton_IsEnabled_Automated
07-17 19:47:47.641  5730  5730 I mono-stdout: Searching sample UITests.Shared.Windows_UI_Xaml_Controls.RadioButtonTests.RadioButton_IsEnabled_Automated
07-17 19:47:47.642  5730  5730 I mono-stdout: Section changed: SamplesContent
07-17 19:47:47.655  5730  5730 E mono-rt : /proc/self/maps:
07-17 19:47:47.655  5730  5730 E mono-rt : 12c00000-12d40000 rw-p 00000000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.655  5730  5730 E mono-rt : 12d40000-12e00000 ---p 00140000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 12e00000-12f00000 rw-p 00200000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 12f00000-12f40000 ---p 00300000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 12f40000-12f80000 rw-p 00340000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 12f80000-13000000 ---p 00380000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 13000000-130c0000 rw-p 00400000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 130c0000-13380000 ---p 004c0000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 13380000-133c0000 rw-p 00780000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 133c0000-13440000 ---p 007c0000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 13440000-13500000 rw-p 00840000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 13500000-13540000 ---p 00900000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 13540000-135c0000 rw-p 00940000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 135c0000-13840000 ---p 009c0000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 13840000-13a00000 rw-p 00c40000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 13a00000-13c80000 ---p 00e00000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 13c80000-2ac00000 rw-p 01080000 00:05 12095                              /dev/ashmem/dalvik-main space (region space) (deleted)
07-17 19:47:47.656  5730  5730 E mono-rt : 59c28000-59c2d000 r-xp 00000000 fc:00 2464                               /system/bin/app_process32
07-17 19:47:47.656  5730  5730 E mono-rt : 59c2d000-59c2e000 r--p 00004000 fc:00 2464                               /system/bin/app_process32
07-17 19:47:47.657  5730  5730 E mono-rt : 59c2e000-59c2f000 rw-p 00000000 00:00 0 
07-17 19:47:47.657  5730  5730 E mono-rt : 70cbf000-70ee4000 rw-p 00000000 fc:01 14669                              /data/dalvik-cache/x86/system@[email protected]
07-17 19:47:47.657  5730  5730 E mono-rt : 70ee4000-70efa000 r--p 00225000 fc:01 14669                              /data/dalvik-cache/x86/system@[email protected]
07-17 19:47:47.657  5730  5730 E mono-rt : 70efa000-70ff1000 rw-p 00000000 fc:01 14672                              /data/dalvik-cache/x86/system@[email protected]
07-17 19:47:47.657  5730  5730 E mono-rt : 70ff1000-71003000 r--p 000f7000 fc:01 14672                              /data/dalvik-cache/x86/system@[email protected]
07-17 19:47:47.657  5730  5730 E mono-rt : 71003000-71034000 rw-p 00000000 fc:01 14675                              /data/dalvik-cache/x86/system@[email protected]
07-17 19:47:47.717  5730  6165 I System.out: URI: /backdoor

Expected behavior

The tests don't fail.

How to reproduce it (as minimally and precisely as possible)

Run the UI tests suite in release.

Environment

Defined here:

https://github.com/unoplatform/uno/blob/master/build/android-uitest-run.sh#L4

Nuget Package:

Package Version(s):

Affected platform(s):

• iOS
• Android
• WebAssembly
• Windows
• Build tasks

Visual Studio

• 2017 (version: )
• 2019 (version: )
• for Mac (version: )

Relevant plugins

• Resharper (version: )

[jeromelaban]

When validating this very specific issue with VS 16.2 Pre 4, I'm not able to reproduce the issue.

[jeromelaban]

Xamarin.Android issue: dotnet/android#3385