This source implements a basic queue for mocking message polling. Most `tempest` topology tests use this `Source`
`Cargo.toml`
```
[dependencies]
tempest-source-mock = "0.1.0"
```
```rust
use tempest_source_mock::prelude::*;
// create a type alias to the MockSourceBuilder
type Source = MockSourceBuilder;
// configure a topology with this source
struct MyTopology {}
impl Topology<Source> for MyTopology {
}
```