fix const tests

Author: maidh91

test/constants.test.js

@@ -84,7 +84,11 @@ test('constants with MOUNT starting with c:', async function (t) {
   t.teardown(teardown)
 
   const constants = require('../constants')
-  t.ok(constants.MOUNT === pathToFileURL('c:/custom/mount').href)
+  if (isWindows) {
+    t.ok(constants.MOUNT === pathToFileURL('c:/custom/mount').href)
+  } else {
+    t.ok(constants.MOUNT === 'file:///c:/custom/mount')
+  }
 })
 
 test('constants with MOUNT starting with file:', { skip: isWindows }, async function (t) {