Is there any ewasm smart contract for testing?
The example contracts of parity cannot be deployed due to exceeding block gas https://github.com/paritytech/pwasm-tutorial/
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The de-facto Hello World contract is WRC-20, which is essentially a subset of ERC20 implemented in Ewasm.It is implemented in a few languages as an example.
In Rust, also implementing all of WRC20: https://github.com/hugo-dc/wrc20-rust/blob/master/src/ewasm_token.rs
Apologies for that, we really need to store the examples centrally. Hopefully this helps.
To clarify some other misconceptions: Kovan is now sunsetted, and also it implements Parity Wasm (Pwasm) rather than Ewasm. The Ewasm testnet is available here: https://ewasm.ethereum.org