Add cargo test validation before generating snippets

.devcontainer/cargo_snippet.sh

@@ -5,6 +5,13 @@
 # Navigate to the lib directory within the workspace folder
 cd $WORKSPACE_FOLDER/src/lib
 
+# Run the tests silently. Exit with an error if tests fail.
+if ! cargo test &>/dev/null; then
+    echo "Error: Tests failed."
+    exit 1
+fi
+
 # Generate Rust code snippets using cargo-snippet, then modify the output using sed to add a scope for Rust,
 # and finally, save the modified output to a rust.code-snippets file in the .vscode directory of the workspace folder
 cargo snippet -t vscode | sed -r "s/\"prefix\"/\"scope\": \"rust\",\n    \"prefix\"/" > $WORKSPACE_FOLDER/.vscode/rust.code-snippets
+echo "Snippets generated."