private val nullUnmarkedAnnotationName = "org.jspecify.annotations.NullUnmarked"

    @Test
    fun `from non-null returning to null-unmarked returning is breaking`() {

        checkNotBinaryCompatibleJava(
            v1 = """
                public class Source {
                    public String foo() { return "bar"; }
                    public String[] baz() { return new String[] {"some"}; }
                }

        runJavaBinaryCompatibilityCheck(v1, v2) {
            assertBinaryCompatible()
            block()
        }

    internal
    fun checkNotBinaryCompatibleJava(@Language("java") v1: String = "", @Language("java") v2: String, block: CheckResult.() -> Unit = {}): CheckResult =
        runJavaBinaryCompatibilityCheck(v1, v2) {
            assertNotBinaryCompatible()