test(wasm): accept a zstd read when the build has the filter

cargo test --workspace unifies clawhdf5-format/zstd on (another member
enables it), so the native interop test read the Zstd dataset that the
wasm build refuses. The fixture now records its values plus the error
the wasm build must give; the native test accepts either, the Node test
of the real wasm package still requires the error.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

crates/clawhdf5-wasm/tests/h5py_interop.rs

@@ -166,9 +166,16 @@ fn check_file(dir: &Path, file: &str, exp: &Value) {
 
     for (path, want) in exp["datasets"].as_object().unwrap() {
         let kind = want["kind"].as_str().unwrap();
-        let a = r
+        let a = match (r.read(path, None), want["unavailable"].as_str()) {
-            .read(path, None)
+            (Ok(a), _) => a,
-            .unwrap_or_else(|e| panic!("{file}:{path}: {e}"));
+            // A filter this build may lack (zstd: the wasm build has it
+            // off, a workspace build may unify it on) must fail clearly.
+            (Err(e), Some(why)) => {
+                assert!(e.contains(why), "{file}:{path}: {e}");
+                continue;
+            }
+            (Err(e), None) => panic!("{file}:{path}: {e}"),
+        };
         assert_eq!(a.shape, shape(&want["shape"]), "{file}:{path} shape");
         let (got_kind, got) = data_strings(&a.data);
         assert_eq!(got_kind, kind, "{file}:{path} kind");

examples/wasm-viewer/test/make_fixture.py

@@ -175,10 +175,12 @@ def describe(path):
                     walk(key.rstrip("/") + "/" + n, o)
             elif obj.dtype.names:
                 expected["errors"][key] = "compound"
-            elif key == "/zstd":
-                expected["errors"][key] = "unsupported filter: 32015"
             else:
                 expected["datasets"][key] = entry(obj, slab_for(obj))
+                if key == "/zstd":
+                    # Refused by the wasm build (no zstd); a native build
+                    # that unifies in clawhdf5-format/zstd reads it.
+                    expected["datasets"][key]["unavailable"] = "unsupported filter: 32015"
 
         walk("/", f)
     return expected

examples/wasm-viewer/test/test.mjs

@@ -69,6 +69,12 @@ for (const [name, exp] of Object.entries(expected)) {
   for (const [path, want] of Object.entries(exp.datasets)) {
     const ctx = `${name}:${path}`;
     eq(file.kind(path), "dataset", `${ctx} kind`);
+    if (want.unavailable) {
+      // The wasm build has no zstd (it links C): a clear error, no data.
+      assert.throws(() => file.read(path), (e) => e.message.includes(want.unavailable), ctx);
+      checks++;
+      continue;
+    }
     const info = file.info(path);
     eq([...info.shape, ...info.elementShape], want.shape, `${ctx} info shape`);
     const r = file.read(path);