sdk: readable clients (no Empty wrapper, no unused error module), documented examples with tests

interface/tests/client.rs

@@ -1,4 +1,18 @@
 //! Check the shared generator against a real example's discovered document.
+
+/// String enums retain the conversion support that their parsers need.
+#[test]
+fn enum_client_keeps_used_error_support() {
+    let doc = serde_json::json!({
+        "components":{"schemas":{"Mode":{"type":"string","enum":["fast","slow"]}}},
+        "methods":[{"name":"mode","params":[],"result":{"schema":{"$ref":"#/components/schemas/Mode"}}}]
+    });
+    let code = sausage_interface::client_rs("settings", &doc).unwrap();
+    assert!(code.contains("pub mod error"));
+    assert!(code.contains("error::ConversionError"));
+    assert!(!code.contains("ModeParams"));
+    syn::parse_file(&code).unwrap();
+}
 #[test]
 fn notes_client_preserves_names_and_docs() {
     let document =
@@ -7,6 +21,8 @@ fn notes_client_preserves_names_and_docs() {
     assert!(code.contains("pub struct AddParams"));
     assert!(code.contains("pub struct Added"));
     assert!(!code.contains("AddedResult"));
+    assert!(!code.contains("pub struct Empty"));
+    assert!(!code.contains("pub mod error"));
     assert!(code.contains("The complete note text"));
     assert!(code.contains("pub fn add(params: AddParams)"));
     syn::parse_file(&code).unwrap();