Guard fixture loop staging

wasm-port/tests/browser/interp_smoke.html

@@ -4336,6 +4336,14 @@
       return wasmPath;
     }
 
+    async function writeLocalErrorGcodeFixture(interp, fixtureName, wasmPath, expectedWasmPath) {
+      if (wasmPath !== expectedWasmPath) {
+        throw new Error(`browser_${fixtureName}_local_error_gcode_staging: path drift`);
+      }
+      interp.writeTextFile(wasmPath, await fetchText(`../fixtures/gcode_errors/${fixtureName}.ngc`));
+      return wasmPath;
+    }
+
     async function loadSimMachineFiles(machineRel, iniFile, programFile = null) {
       const iniText = await fetchText(
         `../../vendor/linuxcnc/configs/sim/${machineRel}/${iniFile}`,
@@ -5215,10 +5223,11 @@
       }
 
       for (const errorFixtureName of INTERP_ERROR_FIXTURES) {
-        const programPath = `/work/${errorFixtureName}-error.ngc`;
-        interp.writeTextFile(
-          programPath,
-          await fetchText(`../fixtures/gcode_errors/${errorFixtureName}.ngc`),
+        const programPath = await writeLocalErrorGcodeFixture(
+          interp,
+          errorFixtureName,
+          `/work/${errorFixtureName}-error.ngc`,
+          `/work/${errorFixtureName}-error.ngc`,
         );
         verifyExpectedFileError(
           `${errorFixtureName}_file`,
@@ -5308,8 +5317,12 @@
       );
 
       for (const fileFixtureName of INTERP_BROWSER_FILE_FIXTURES) {
-        const programPath = `/work/${fileFixtureName}.ngc`;
-        interp.writeTextFile(programPath, await fetchText(`../fixtures/gcode/${fileFixtureName}.ngc`));
+        const programPath = await writeLocalGcodeFixture(
+          interp,
+          fileFixtureName,
+          `/work/${fileFixtureName}.ngc`,
+          `/work/${fileFixtureName}.ngc`,
+        );
         verifyExpectedOutput(
           `${fileFixtureName}_file`,
           interp.runFile(programPath),