doc: add comments to .github/test.sh

.github/test.sh

@@ -1,31 +1,54 @@
 #!/usr/bin/env bash
+
+# NOTE: `cargo test [TESTNAME]` is used to filter only the submodule with tests to test a 
+# specific feature or features' combination 
+# e.g. `cargo test --features rc,unstable__schema 'schema::test_rc'` is used to test `BorshSchema`
+# implementation of `std::rc::Rc` and `std::sync::Arc`, 
+# where `[TESTNAME]` argument is set to `schema::test_rc`, which filters out tests from `schema::test_rc`
+# submodule of `borsh/tests/tests.rs`
 set -e
 set -x
 export INSTA_UPDATE=no
 pushd borsh
+############################ borsh `default-features = true` group #########################
+########## general group
 cargo test --no-run
 cargo test
+cargo test --features derive
+cargo test --features unstable__schema
+########## features = ["ascii"] group
 cargo test --features ascii 'roundtrip::test_ascii_strings'
 cargo test --features ascii 'deserialization_errors::test_ascii_strings'
 cargo test --features ascii,unstable__schema 'schema::test_ascii_strings'
-cargo test --features derive
-cargo test --features unstable__schema
+########## features = ["rc"] group
 cargo test --features rc 'roundtrip::test_rc'
 cargo test --features rc,unstable__schema 'schema::test_rc'
+########## features = ["de_strict_order"] group
 cargo test --features de_strict_order 'roundtrip::test_hash_map'
 cargo test --features de_strict_order 'roundtrip::test_btree_map'
-cargo test --features derive,bson 'roundtrip::requires_derive_category::test_bson_object_ids'
-cargo test --features derive,bytes 'roundtrip::requires_derive_category::test_ultimate_many_features_combined'
+########## features = ["bson"] group
+cargo test --features bson,derive 'roundtrip::requires_derive_category::test_bson_object_ids'
+########## features = ["bytes"] group
+cargo test --features bytes,derive 'roundtrip::requires_derive_category::test_ultimate_many_features_combined'
 
+
+############################ borsh `default-features = false` group #########################
+########## general group
 cargo test --no-default-features
+cargo test --no-default-features --features derive
+cargo test --no-default-features --features unstable__schema
+########## features = ["ascii"] group
 cargo test --no-default-features --features ascii 'roundtrip::test_ascii_strings'
 cargo test --no-default-features --features ascii 'deserialization_errors::test_ascii_strings'
 cargo test --no-default-features --features ascii,unstable__schema 'schema::test_ascii_strings'
-cargo test --no-default-features --features derive
-cargo test --no-default-features --features unstable__schema
+########## features = ["rc"] group
 cargo test --no-default-features --features rc 'roundtrip::test_rc'
 cargo test --no-default-features --features rc,unstable__schema 'schema::test_rc'
+########## features = ["hashbrown"] group
 cargo test --no-default-features --features hashbrown
+cargo test --no-default-features --features hashbrown,derive
+cargo test --no-default-features --features hashbrown,unstable__schema
 popd
 pushd borsh-derive
+############################ borsh-derive group #########################
 cargo test --features schema

borsh/tests/compile_derives/test_generic_enums.rs

@@ -1,5 +1,8 @@
 use borsh::{BorshDeserialize, BorshSerialize};
 
+#[allow(unused)]
+use alloc::{string::String, vec::Vec};
+
 #[cfg(feature = "hashbrown")]
 use hashbrown::HashMap;