Merge branch '29-issue-10-own_code_hash'

# Conflicts:
#	test-cases/own-code-hash/README.md

test-cases/code-hash/other_contract/Cargo.toml

@@ -19,7 +19,7 @@ e2e-tests = []
 
 [dependencies]
 ink = { version = "4.2.1", default-features = false }
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["derive"] }
+scale = { package = "parity-scale-codec", version = "=3.6.5", default-features = false, features = ["derive"] }
 scale-info = { version = "2.6", default-features = false, features = ["derive"], optional = true }
 
 [dev-dependencies]

test-cases/own-code-hash/README.md

@@ -0,0 +1,31 @@
+# Function `own_code_hash`
+
+```rust
+pub fn own_code_hash<E>() -> Result<E::Hash>
+```
+
+## Description
+
+Retrieves the code hash of the currently executing contract.
+
+## Related ink! functions
+
+- [`own_code_hash`](https://paritytech.github.io/ink/ink_env/fn.own_code_hash.html)
+
+## Test case
+
+Test case intend to showcase how `own_code_hash` is working in both Integration and End-to-End scenarios. To check the retrieved code hash is correct, we compared it with the code obtained via [`code_hash`](https://paritytech.github.io/ink/ink_env/fn.code_hash.html) by providing the contract `account_id`.
+
+Note in Integration this last step it is not possible due to lack of [`code_hash`](https://paritytech.github.io/ink/ink_env/fn.code_hash.html) implementation, so it is just tested that [`own_code_hash`](https://paritytech.github.io/ink/ink_env/fn.own_code_hash.html) can be called.
+
+| \#  | Test                                                    | Integration | E2E |
+| --- | ------------------------------------------------------- | :---------: | :-: |
+| 1   | Attempts to get the code hash of the executing contract |     ❌      | ✅  |
+
+## Comparison Integration vs E2E
+
+Test 1 worked as expected in End-to-End but did not on Integration since it's [not implemented](https://github.com/paritytech/ink/blob/c2af39883aab48c71dc09dac5d06583f2e84dc54/crates/env/src/engine/off_chain/impls.rs#L535).
+
+## Result
+
+See estimate for code_hash().