TEST(QueryProjectionTest, IdInclusionProjectionDoesNotPreserveOtherFields) {
    auto proj = createProjection("{}", "{_id: 1}");
    ASSERT_FALSE(proj.isFieldRetainedExactly("a"));
}
TEST(QueryProjectionTest, IdInclusionProjectionDoesNotPreserveOtherFields) {
    auto proj = createProjection("{}", "{_id: 1}");
    ASSERT_FALSE(proj.isFieldRetainedExactly("a"));
}