So this test verifies that building an APK using the namespace works, but I'd like to assert that the namespace value is also correct. Any tips on how to do that? Or is that not required (as the test already validates that the APK is built without errors)

I don't think this test validates your change--I reverted your lib/src changes and this test still passes.

Can you test AndroidApk.fromAndroidProject()?

@christopherfujino I had mismatching results when originally running this test.
The fileSystem created in the test would report that the appManifestFile exists, but the globals.fs file system in this getter reported that it did not exist.

According to a doc comment I can override globals.fs in tests. I don't see the setUp((){}) doing something like that. What would be the right thing to do here?

A) Override globals.fs in the test
B) Fix the getter to use hostAppGradleRoot, which does use the fileSystem that was set up in the specific test (which is what I did here)

Good find. Looks like whatever test you copy-pasted this from was also leaking the real file system. The whole purpose of the testUsingContext() function you're calling is that it allows you to provide overrides to the Zone/context getters (globals.fs is essentially calling `context.get();).

Here is an example of constructing a FileSystem in setUp and then providing it as a context override for a testUsingContext invocation: https://github.com/flutter/flutter/blob/master/packages/flutter_tools/test/commands.shard/hermetic/build_test.dart#L60

although if it makes sense, what you did here is probably better (it looks cleaner)

Thanks for the tip, I'll update the test with an override for the file system. I'll keep that in mind for the next time I need to write tests like this.