推进 OPFS 机器会话快照加载入口

wasm-port/tests/opfs/node/verify_file_service.mjs

@@ -18,6 +18,7 @@ import {
 import {
   createMachineSessionSnapshotPayload,
   createSessionSnapshot,
+  loadMachineSessionSnapshot,
   loadSessionSnapshot,
   saveMachineSessionSnapshot,
   saveSessionSnapshot,
@@ -350,6 +351,40 @@ assert.deepEqual(
   }),
   machineSessionSnapshot,
 );
+assert.deepEqual(
+  await loadMachineSessionSnapshot("machine-session-1", "xyzab-tdr", {
+    storage,
+    filename: "machine-session-snapshot.json",
+  }),
+  machineSessionSnapshot,
+);
+await assert.rejects(
+  () => loadMachineSessionSnapshot("machine-session-1", "other-machine", {
+    storage,
+    filename: "machine-session-snapshot.json",
+  }),
+  /Machine session snapshot id mismatch/,
+);
+await saveTextFile(
+  sessionSnapshotPath("machine-session-bad-files"),
+  JSON.stringify({
+    ...machineSessionSnapshot,
+    sessionId: "machine-session-bad-files",
+    payload: {
+      machineId: "xyzab-tdr",
+      files: {
+        ini: "linuxcnc/machines/xyzab-tdr/machine.ini",
+        parameters: "../linuxcnc.var",
+        toolTable: "linuxcnc/machines/xyzab-tdr/tool.tbl",
+      },
+    },
+  }),
+  storage,
+);
+await assert.rejects(
+  () => loadMachineSessionSnapshot("machine-session-bad-files", "xyzab-tdr", { storage }),
+  /Invalid OPFS path/,
+);
 
 await saveMachineTextFiles("xyzab-tdr", {
   ini: "[EMC]\nMACHINE = xyzab-tdr\n",