Update Running Tests docs section

commit-id:9e36d3c9

docs/src/development/environment-setup.md

@@ -8,15 +8,14 @@
 ### Rust
 
 Install the latest stable [Rust](https://www.rust-lang.org/tools/install) version.
-If you already have Rust installed make sure to upgrade it by running
+If you already have Rust installed make sure to upgrade it by running:
 
 ```shell
 $ rustup update
 ```
 
 ### Scarb
 You can read more about installing Scarb [here](https://docs.swmansion.com/scarb/download.html)
-
 Please make sure you're using Scarb installed via [asdf](https://asdf-vm.com/) - otherwise some tests may fail.
 > To verify, run:
 > 
@@ -28,49 +27,64 @@ Please make sure you're using Scarb installed via [asdf](https://asdf-vm.com/) -
 > $HOME/.asdf/shims/scarb
 > ```
 > 
-> If you previously installed scarb using official installer, you may need to remove this installation or modify your PATH to make sure asdf installed one is always used.
-
-
-> ❗️ **Warning**
-> 
-> If you haven't pushed your branch to the remote yet (you've been working only locally), two tests will fail:
-> 
-> - `e2e::running::init_new_project_test`
-> - `e2e::running::simple_package_with_git_dependency`
+> 💡 **Info**
 > 
-> After pushing the branch to the remote, those tests should pass.
+> If you previously installed Scarb using official installer, you may need to remove that installation or modify your `PATH`
+> to make sure the version installed by `asdf` is always used.
 
 ### Starknet Devnet
-To install it run `./scripts/install_devnet.sh`
+To install it, run `./scripts/install_devnet.sh`
 
 ### Universal sierra compiler
 Install the latest [universal-sierra-compiler](https://github.com/software-mansion/universal-sierra-compiler) version.
 
+### Environmental variables
 
+Set `NODE_URL` environmental variable to a Sepolia testnet node URL:
+ - either manually in your shell
+ ```shell
+ $ export NODE_URL="https://example.com" 
+ ```
+ - or inside [`.cargo/config.toml` file](https://doc.rust-lang.org/cargo/reference/config.html#configuration-format)
+ ```toml
+ [env]
+ NODE_URL = "https://example.com/rpc"
+ ```
+
+Additionally, if you want to run your tests on GitHub Actions, you need to 
+[set a secret variable](https://docs.github.com/en/actions/security-guides/using-secrets-in-github-actions#creating-secrets-for-a-repository)
 
 ## Running Tests
-Tests can be run with:
+After performing these steps, you can run tests with:
 
 ```shell
 $ cargo test
 ```
 
+> ❗️ **Warning**
+>
+> If you haven't pushed your branch to the remote yet (you've been working only locally), two tests will fail:
+>
+> - `e2e::running::init_new_project_test`
+> - `e2e::running::simple_package_with_git_dependency`
+>
+> After pushing the branch to the remote, those tests should pass.
 
 ## Formatting and Lints
 
-Starknet Foundry uses [rustfmt](https://github.com/rust-lang/rustfmt) for formatting. You can run the formatter with
+Starknet Foundry uses [rustfmt](https://github.com/rust-lang/rustfmt) for formatting. You can run the formatter with:
 
 ```shell
 $ cargo fmt
 ```
 
-For linting, it uses [clippy](https://github.com/rust-lang/rust-clippy). You can run it with this command:
+For linting, it uses [clippy](https://github.com/rust-lang/rust-clippy). You can run it with:
 
 ```shell
 $ cargo clippy --all-targets --all-features -- --no-deps -W clippy::pedantic -A clippy::missing_errors_doc -A clippy::missing_panics_doc -A clippy::default_trait_access
 ```
 
-Or using our defined alias
+or using our defined alias:
 
 ```shell
 $ cargo lint
@@ -80,13 +94,13 @@ $ cargo lint
 
 Starknet Foundry uses [typos](https://github.com/marketplace/actions/typos-action) for spelling checks.
 
-You can run the checker with
+You can run the checker with:
 
 ```shell
 $ typos
 ```
 
-Some typos can be automatically fixed by running
+Some typos can be automatically fixed by running:
 
 ```shell
 $ typos -w