Track changes to generated code in test vectors

.github/workflows/rust.yml

@@ -233,6 +233,28 @@ jobs:
         git grep "${version}" -- soroban-sdk/src/_migrating.rs \
           || (echo "The _migrating ${version} section is missing." && exit 1)
 
+  expand-test-wasms:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - uses: stellar/actions/rust-cache@main
+    - name: Install minimum supported rust version
+      run: |
+        msrv="$(make msrv)"
+        rustup install $msrv
+        rustup target add --toolchain $msrv wasm32v1-none
+    - uses: stellar/binaries@v45
+      with:
+        name: cargo-hack
+        version: 0.5.28
+    - uses: stellar/binaries@v45
+      with:
+        name: cargo-expand
+        version: 1.0.116
+    - run: make expand-tests
+    - name: Check no diffs exist
+      run: git add -N . && git diff HEAD --exit-code
+
   publish-dry-run:
     if: github.event_name == 'push' || startsWith(github.head_ref, 'release/')
     strategy:

Makefile

@@ -43,6 +43,22 @@ readme:
 		| jq -r '.index[.root|tostring].docs' \
 		> README.md
 
+# Expands the generated code within each test vector contract that lives in the
+# tests/ directory. Serves to surface visible changes in generated code that
+# may not be obvious when making changes to sdk macros.
+expand-tests: build-test-wasms
+	rm -fr tests-expanded
+	mkdir -p tests-expanded
+	RUSTUP_TOOLCHAIN=$(TEST_CRATES_RUSTUP_TOOLCHAIN) ; \
+	RUSTFLAGS='--cfg soroban_sdk_internal_no_rssdkver_meta' ; \
+	for package in $(TEST_CRATES); do \
+		echo "Expanding $$package for linux target including tests"; \
+		cargo expand --package $$package --tests --target x86_64-unknown-linux-gnu | rustfmt > tests-expanded/$${package}_tests.rs; \
+		echo "Expanding $$package for wasm32v1-none target without tests"; \
+		RUSTFLAGS='--cfg soroban_sdk_internal_no_rssdkver_meta' \
+			cargo expand --package $$package --release --target wasm32v1-none | rustfmt > tests-expanded/$${package}_wasm32v1-none.rs; \
+	done
+
 fmt:
 	cargo fmt --all