Guard browser OPFS invalid INI lines helper

wasm-port/tests/browser/interp_smoke.html

@@ -4642,6 +4642,17 @@
       );
     }
 
+    function opfsInvalidIniLines(machineId, section, assignment) {
+      return [
+        "[EMC]",
+        `MACHINE = ${machineId}`,
+        "",
+        `[${section}]`,
+        assignment,
+        "",
+      ];
+    }
+
     function assertSimConfigStagingPlan(machineRel, plan, expectedWasmDir) {
       if (plan.wasmDir !== expectedWasmDir) {
         throw new Error(`${machineRel}: browser sim staging root drift`);
@@ -9775,14 +9786,11 @@
         interp,
         ini,
         "browser-invalid-param-file-session",
-        [
-          "[EMC]",
-          "MACHINE = browser-invalid-param-file-session",
-          "",
-          "[RS274NGC]",
+        opfsInvalidIniLines(
+          "browser-invalid-param-file-session",
+          "RS274NGC",
           "PARAMETER_FILE = ../escape.var",
-          "",
-        ],
+        ),
         /Invalid parameter filename/,
       );
 
@@ -9791,14 +9799,11 @@
         interp,
         ini,
         "browser-invalid-tool-file-session",
-        [
-          "[EMC]",
-          "MACHINE = browser-invalid-tool-file-session",
-          "",
-          "[EMCIO]",
+        opfsInvalidIniLines(
+          "browser-invalid-tool-file-session",
+          "EMCIO",
           "TOOL_TABLE = nested/tool.tbl",
-          "",
-        ],
+        ),
         /Invalid tool table filename/,
       );