Android unit tests with Conscrypt

I am unable to run android unit tests when using org.conscrypt:conscrypt-android:2.0.0 as my dependency. I am running into following error when trying to add OpenSSLProvider as a Security Provider :

java.lang.UnsatisfiedLinkError: no conscrypt_jni in java.library.path

	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
	at java.lang.Runtime.loadLibrary0(Runtime.java:870)
	at java.lang.System.loadLibrary(System.java:1122)
	at org.conscrypt.NativeCryptoJni.init(NativeCryptoJni.java:28)
	at org.conscrypt.NativeCrypto.<clinit>(NativeCrypto.java:65)
	at org.conscrypt.OpenSSLProvider.<init>(OpenSSLProvider.java:60)
	at org.conscrypt.OpenSSLProvider.<init>(OpenSSLProvider.java:53)
	at org.conscrypt.OpenSSLProvider.<init>(OpenSSLProvider.java:49)

Since unit tests run on the local machine, it fails to link native libraries that are compiled for different platform(mac in my case)? Is there a workaround/solution available for this?

PFA a simple android project where running the unit test reproduces the issue ConscryptRepro.zip

[icksonb]

I tried this:

dependencies {
    ...
    compileOnly 'org.conscrypt:conscrypt-openjdk-uber:2.5.1'
    runtimeOnly 'org.conscrypt:conscrypt-android:2.5.1'
    testImplementation 'org.conscrypt:conscrypt-openjdk-uber:2.5.1'
    ...
}

and it worked for me.

[flooey]

Ah, I see the problem. Yeah, as far as I know (or have been able to find on the Internet), there isn’t a simple solution to this.

As you note, the local unit tests run on your local machine in a JVM, rather than in an Android environment. As a result, the Android dependency (which is packaged differently and such) doesn’t work out of the box, but the OpenJDK dependency does. (If you change your dependency to org.conscrypt:conscrypt-openjdk-uber:2.0.0 in the sample project, you can see that it works.)

Unfortunately, I wasn’t able to find a good way to deal with that. The main things people mentioned were:

• Skip the local unit tests and only use Android unit tests, so you never deal with this situation
• Rewrite the classpath for your tests in gradle to remove the Android dependency and replace it with the OpenJDK one
• Use LD_LIBRARY_PATH to point the library loader at the Android library, which will probably work (since we don’t use much from the NDK) but doesn’t really come with any guarantees

Sadly, I don’t think this is something we can improve on the Conscrypt side. Fundamentally, native library loading works differently in Android and on a JVM, and we need to package things so they work on Android in the Android distribution. If you find that one of those solutions works well for you, though, we could add some docs that show how it’s done to help future users.