Changed . token to _dot

This change allows the dotfiles to work with chezmoi (e.g: on windows)
and improves grepability with neovim/telescope

dot_config/nushell/nu_scripts/modules/language/playground/mod.nu

@@ -0,0 +1,54 @@
+export def main [topic, closure] {
+  with-env {N: 5 REJECT: slow } {
+    print (echo $topic " tests" (char newline) | str join)
+
+    do $closure
+  }
+}
+
+export def scene [
+  topic: any
+  --tag: string
+  closure: closure
+] {
+  print $"  ($topic)(char newline)"
+  do $closure
+}
+
+export def play [
+  topic: any
+  --tag: string
+  closure: closure
+] {
+  let is_tag_empty = ($tag | is-empty);
+  let should_run_all = ($env | get -i RUN_ALL | default false);
+
+  if $is_tag_empty {
+      do $closure $topic
+  } else {
+      if $tag == $env.REJECT and $should_run_all {
+          $"    ($topic) ... (ansi yellow)skipped(ansi reset) (char newline)"
+      } else {
+          do $closure $topic
+      }
+  }
+}
+
+export def expect [
+  topic: string
+  actual: list<any>
+  --to-be: list<any>
+] {
+  let are_equal = (($actual |  length) == ($to_be | length)) and ($actual | zip $to_be | all {|case|
+      $case.0 == $case.1
+    }
+ )
+
+  let line = (if true == $are_equal {
+          $"(ansi green)ok(ansi reset)(char newline)"
+      } else {
+          $"(ansi red)failed(ansi reset)(char newline)"
+      }
+  )
+  $"    ($topic) ... ($line)"
+}