Fix nits, remove WASM deps from nostd test, improve comments

signer/src/sr25519.rs

@@ -3,6 +3,10 @@
 // see LICENSE for license details.
 
 //! An sr25519 keypair implementation.
+//! 
+//! **Note:** This implementation requires the `getrandom` dependency to obtain randomness,
+//! and will not compile on targets that it does not support. See the supported `getrandom`
+//! targets here: <https://docs.rs/getrandom/latest/getrandom/#supported-targets>.
 
 use core::str::FromStr;
 

signer/tests/no-std/Cargo.toml

@@ -5,9 +5,6 @@ edition = "2021"
 publish = false
 
 [dev-dependencies]
-wasm-bindgen-test = "0.3.24"
-tracing-wasm = "0.2.1"
-console_error_panic_hook = "0.1.7"
 
 # This crate is not a part of the workspace, because we want to
 # enable the "web" feature here but don't want it enabled as part

signer/tests/no-std/tests/no_std.rs

@@ -1,4 +1,4 @@
-#[no_std]
+#![no_std]
 
 use subxt_signer::{ecdsa, eth, sr25519};
 

testing/no-std-tests/src/main.rs

@@ -42,6 +42,7 @@ fn compile_test() {
     subxt_metadata::Metadata::decode(&mut &METADATA[..]).expect("should be valid metadata");
 
     // Subxt signer compiles (though nothing much works on this particular nostd target...):
+    // Supported targets: <https://docs.rs/getrandom/latest/getrandom/#supported-targets>
     use core::str::FromStr;
     let _ = subxt_signer::SecretUri::from_str("//Alice/bar");