test(parser): ensure identifier can be escaped

tests/parser.spec.ts

@@ -95,6 +95,25 @@ test.group('Env Parser', () => {
     })
   })
 
+  test('allows to escape the identifier', async ({ assert, cleanup, expectTypeOf }) => {
+    cleanup(() => {
+      EnvParser.removeIdentifier('file')
+    })
+
+    EnvParser.identifier('file', (_value: string) => {
+      return '3000'
+    })
+
+    const envString = ['ENV_USER=file\\:///root/app/user.js'].join('\n')
+    const parser = new EnvParser(envString)
+    const parsed = await parser.parse()
+
+    expectTypeOf(parsed).toEqualTypeOf<DotenvParseOutput>()
+    assert.deepEqual(parsed, {
+      ENV_USER: 'file:///root/app/user.js',
+    })
+  })
+
   test('throw when identifier is already defined', async ({ assert, cleanup }) => {
     cleanup(() => {
       EnvParser.removeIdentifier('file')