fixup! test: add and use expectSyncExitWithoutError() and expectSyncExit() utils

Co-authored-by: Mohammed Keyvanzadeh <[email protected]>

Author: joyeecheung

test/common/README.md

@@ -63,7 +63,7 @@ coming from child processes.
   * `stdout` [\<string>][<string>] | [\<RegExp>][<RegExp>] |
     [\<Function>][<Function>] Optional. Similar to `stderr` but for the stdout.
   * `trim` [\<boolean>][<boolean>] Optional. Whether this method should trim
-    out the whitespace charaters when checking `stderr` and `stdout` outputs.
+    out the whitespace characters when checking `stderr` and `stdout` outputs.
     Defaults to `false`.
 
 ### `expectSyncExitWithoutError(child[, options])`