Guard bad fixture staging paths

wasm-port/tests/browser/interp_smoke.html

@@ -6995,8 +6995,10 @@
       if (badInterpFixtures.length !== 21 || new Set(badInterpFixtures.map((fixture) => fixture.file)).size !== badInterpFixtures.length) {
         throw new Error("browser_interp_bad_fixture_coverage: list drift");
       }
+      const badStagedNgcFiles = [];
       for (const badFixture of badInterpFixtures) {
         const badPath = await writeInterpRegressionFile(interp, "bad", badFixture.file);
+        badStagedNgcFiles.push(badPath);
         verifyExpectedOutput(
           `browser_interp_bad_${badFixture.name}`,
           interp.runFile(badPath),
@@ -7010,6 +7012,10 @@
           ].join("\n"),
         );
       }
+      const badStagedRelativeNgcFiles = badStagedNgcFiles.map((path) => path.replace("/work/browser-interp/bad/", ""));
+      if (badStagedRelativeNgcFiles.join(",") !== badInterpFixtures.map((fixture) => fixture.file).join(",")) {
+        throw new Error("browser_interp_bad_staging_manifest: list drift");
+      }
 
       const g33_1Path = await writeInterpRegressionFile(interp, "g33.1", "g33.1.ngc");
       const g33_1NgcFiles = [

wasm-port/tests/wasm/node/verify_interp_wasm.mjs

@@ -1930,8 +1930,10 @@ assert.deepEqual(
   interpRegressionNgcFiles("bad"),
   "interp bad fixture coverage drift",
 );
+const badStagedNgcFiles = [];
 for (const badFixture of badInterpFixtures) {
   const badPath = writeInterpRegressionFile("bad", badFixture.file);
+  badStagedNgcFiles.push(badPath);
   verifyExpectedOutput(
     `interp_bad_${badFixture.name}_wasm`,
     interp.runFile(badPath),
@@ -1945,6 +1947,11 @@ for (const badFixture of badInterpFixtures) {
     ].join("\n"),
   );
 }
+assert.deepEqual(
+  badStagedNgcFiles,
+  badInterpFixtures.map((fixture) => `/work/interp/bad/${fixture.file}`),
+  "interp bad staging manifest drift",
+);
 
 const g33_1Path = writeInterpRegressionFile("g33.1", "g33.1.ngc");
 const g33_1NgcFiles = [