# BasicQuery
```rust
use bevy::prelude::*;
use rmv_bevy_testing_tools::prelude::*;
use rstest::rstest;
#[rstest]
fn some_test(#[from(test_app)] mut app: TestApp) {
// ...
if app.query_any::<&Camera, _>() {
// an entity with Camera exists
}
if app.query_any::<(&Camera, &Transform), _>() {
// an entity with Camera and Transform exists
}
}
```