First, I am talking about "test", not "androidTest". I created a test data file and put it in "test"'s asset directory. Android Studio shows that it belongs to the test, not AndroidTest, as below:

Now, how can I open that file in a local test? I guess I could specify the full path or a relative path, but I think that there probably is a way to specify file name only, like the androidTest example:

getInstrumentation()
.getContext()
.getResources()
.getAssets()
.open("test.txt");

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PS: In case there is no such convenient way, I have tested things a little bit and the test's working directory is the "app" directory, so the following code worked.

val f = File(".\\src\\test\\assets\\test.txt");
val text = f.readText();