Test assertion that object is equal to a non-null object isn't recognised

If we have a test assertion that an object is equal to some other non-null object, NullAway doesn't treat this as if we had directly asserted that the object was non-null.

We're currently using NullAway v0.9.1.

Example class:

import javax.annotation.Nullable;
public class A {
    @Nullable
    public String getThing() {
        return "ok";
    }
}

Example test:

import org.junit.jupiter.api.Test;
import static org.hamcrest.MatcherAssert.*;
import static org.hamcrest.Matchers.*;
public class TestA {
    @Test
    public void testGetThing() {
        String thing = new A().getThing();
        String expected = "ok";

        // This line implicitly shows that `thing` is not null
        assertThat(thing, is(expected));

        // Workaround is to uncomment this line
        // assertThat(thing, is(notNullValue()));

        assertThat(thing.length(), is(2));
    }
}

Reproduce the report with the shown A and TestA examples using NullAway v0.9.1, then trace how the assertion assertThat(thing, is(expected)) is handled. Done means NullAway recognizes the non-null equality assertion so the following thing.length() is accepted, while the existing notNullValue workaround remains valid.