Make scss tests work on Windows too. (#37713)

Also, add missing `'use strict'` statements; these aren't real modules.

scss/tests/jasmine.js

@@ -1,16 +1,17 @@
 /* eslint-env node */
 
-const path = require('node:path')
+/* eslint-disable camelcase */
 
-module.exports = {
-  spec_dir: 'scss' /* eslint-disable-line camelcase */,
+'use strict'
 
-  // Make Mocha look for `.test.scss` files
-  spec_files: ['**/*.{test,spec}.scss'] /* eslint-disable-line camelcase */,
+const path = require('node:path')
 
+module.exports = {
+  spec_dir: 'scss',
+  // Make Jasmine look for `.test.scss` files
+  spec_files: ['**/*.{test,spec}.scss'],
   // Compile them into JS scripts running `sass-true`
   requires: [path.join(__dirname, 'sass-true/register')],
-
   // Ensure we use `require` so that the require.extensions works
   // as `import` completely bypasses it
   jsLoader: 'require'

scss/tests/sass-true/register.js

@@ -1,10 +1,15 @@
 /* eslint-env node */
 
-const runnerPath = require('node:path').join(__dirname, 'runner')
+'use strict'
+
+const path = require('node:path')
+const runnerPath = path.join(__dirname, 'runner').replace(/\\/g, '/')
+
+require.extensions['.scss'] = (module, filename) => {
+  const normalizedFilename = filename.replace(/\\/g, '/')
 
-require.extensions['.scss'] = function (module, filename) {
   return module._compile(`
     const runner = require('${runnerPath}')
-    runner('${filename}',{describe, it})
+    runner('${normalizedFilename}', { describe, it })
     `, filename)
 }

scss/tests/sass-true/runner.js

@@ -1,12 +1,14 @@
 /* eslint-env node */
 
+'use strict'
+
 const { runSass } = require('sass-true')
 const fs = require('node:fs')
 const path = require('node:path')
 
-module.exports = function (filename, { describe, it }) {
-  const data = fs.readFileSync(filename, { encoding: 'utf8' })
-  const TRUE_SETUP = '$true-terminal-output: false; @import \'true\';'
+module.exports = (filename, { describe, it }) => {
+  const data = fs.readFileSync(filename, 'utf8')
+  const TRUE_SETUP = '$true-terminal-output: false; @import "true";'
 
   runSass({
     data: TRUE_SETUP + data,