update readme or add script to check for compilation issues

[tomholub]

@IvanPizhenko

Now just want to see if semaphore passes.

It was compilation issues. To prevent such an issue you can use 2 ways (for both way you have to have at least 1 connected device - an emulator or a real device):

1. Use Android Studio to just print tests names(Print all tests)
   

If that task passes there are no compilation issues

2. Use the following command ./gradlew clean :FlowCrypt:connectedDevTestDebugAndroidTest -Pandroid.testInstrumentationRunnerArguments.log=true. If the task fails you will see compilation errors like this
   

Originally posted by @DenBond7 in #1102 (comment)

[tomholub]

I'm pulling this out into an issue - maybe can add ./script/compile.sh or something similar. Either that, or update the readme - this is useful to know.

[IvanPizhenko]

I'd say test.sh

[IvanPizhenko]

There's a trouble with running tests inside the cloud Linux VM according to Den's instructions:

> Task :FlowCrypt:connectedDevTestDebugAndroidTest FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':FlowCrypt:connectedDevTestDebugAndroidTest'.
> com.android.builder.testing.api.DeviceException: No connected devices!

I just can't run native x86 Android emulator.

Unfortunately, your computer does not support hardware accelerated virtualization.
Here are some of your options:
 1) Use a physical device for testing
 2) Develop on a Windows/OSX computer with an Intel processor that supports VT-x and NX
 3) Develop on a Linux computer that supports VT-x or SVM
 4) Use an Android Virtual Device based on an ARM system image
   (This is 10x slower than hardware accelerated virtualization)

Will try ARM one - looks like the only option.

The other option is to purchase dedicated physical box for Linux -$500 min for something reasonable (Core i5 Mobile, 16GB, SSD) - did not plan to do that.

[IvanPizhenko]

But tests run in the CI. How is that possible? Does CI use physical machines?

[DenBond7]

CI supports virtualization. We can run x86 emulators

[DenBond7]

I'd say test.sh

Actually, you just print all tests. I think it'll be better to call it print-all-tests.sh.

[IvanPizhenko]

@DenBond7 I've found that there's already a script named run-all-test.sh with a following content:

./gradlew --console=verbose :FlowCrypt:connectedDevTestDebugAndroidTest

Isn't this the same?

You've added -Pandroid.testInstrumentationRunnerArguments.log=true. What does it mean?
Maybe just update that script and add this extra option?

[IvanPizhenko]

Found something about "nested virtualization" - will try to enable it on the VM. But meanwhile trying the ARM image.

[IvanPizhenko]

Hmm... no luck with ARM either...

The emulator process for AVD ARM_Nexus_S_API_S was killed.

seems like need to try that "nested virtualization"

[DenBond7]

@IvanPizhenko

Isn't this the same?

Almost the same. run-all-test.sh runs all tests. print-all-tests.sh should be just print all tests.

You've added -Pandroid.testInstrumentationRunnerArguments.log=true. What does it mean?

From here

To run in 'log only' mode -e log true This option will load and iterate through all test classes and methods, but will bypass actual test execution. Useful for quickly obtaining info on the tests to be executed by an instrumentation command.

Maybe just update that script and add this extra option?

Yes, we can do that.

[DenBond7]

Hmm... no luck with ARM either...

The emulator process for AVD ARM_Nexus_S_API_S was killed.

seems like need to try that "nested virtualization"

@IvanPizhenko Please look at this line

flowcrypt-android/script/ci-install-android-sdk.sh

Line 15 in 63b6748

sudo apt-get -qq install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils > /dev/null

That's how we enable virtualization.

[IvanPizhenko]

I am talking about enabling nested virtualization in the VM settings. At the moment VM itself does not support it. Android studio has already installed emulator but it cannot be used because no any virtualization available in the my Linux VM.