fix(e2e): deploy contracts without Solidity constructor when not need…

…ed (#295)

This PR changes the `e2e` testing library to allow deployments of
contracts without a constructor., when the constructor file is not
present. This is already allowed by
[koba](https://github.com/OpenZeppelin/koba/blob/main/src/generator.rs#L27-L30).

#### PR Checklist

- [x] Tests
- [ ] ~Documentation~ (not required)

---------

Co-authored-by: Daniel Bigos <daniel.bigos@openzeppelin.com>
Co-authored-by: Alisander Qoshqosh <qalisander@gmail.com>

lib/e2e/src/deploy.rs

@@ -1,3 +1,5 @@
+use std::path::Path;
+
 use alloy::{rpc::types::TransactionReceipt, sol_types::SolConstructor};
 use koba::config::Deploy;
 
@@ -45,11 +47,13 @@ impl Deployer {
  let pkg = Crate::new()?;
  let wasm_path = pkg.wasm;
  let sol_path = pkg.manifest_dir.join("src/constructor.sol");
+ let sol =
+ if Path::new(&sol_path).exists() { Some(sol_path) } else { None };
 
  let config = Deploy {
  generate_config: koba::config::Generate {
  wasm: wasm_path.clone(),
- sol: Some(sol_path),
+ sol,
  args: self.ctr_args,
  legacy: false,
  },