EXECUTE: Create a CDI project (with CDI support enabled)
EXECUTE: Add any CDI problem. For instance:

public class Test {

    @Inject String foo;

    @Produces
    public String foo1() {
        return "";
    }

    @Produces
    public String foo2() {
        return "";
    }
}

ASSERT: There is a CDI problem marker on @Inject String foo;
EXECUTE: Disable CDI support in Project Properties page. Clean/re-build the project.
FAILURE: There is still CDI problem markers in the project.
ASSERT: The CDI problem disappeared.