remove deprected ./tests/impure

tests/impure/default.nix

@@ -1,41 +0,0 @@
-{
-  async,
-  coreutils,
-  lib,
-  # dream2nix
-  callPackageDream,
-  utils,
-  ...
-}: let
-  l = lib // builtins;
-
-  allTestFiles =
-    l.attrNames
-    (l.filterAttrs
-      (name: type: type == "regular" && l.hasPrefix "test_" name)
-      (l.readDir ./.));
-
-  allTests =
-    l.map
-    (file: callPackageDream "${./.}/${file}" {})
-    allTestFiles;
-
-  executeAll =
-    utils.writePureShellScript
-    [
-      async
-      coreutils
-    ]
-    ''
-      S=$(mktemp)
-      async -s=$S server --start -j$(nproc)
-
-      for test in ${toString allTests}; do
-        async -s=$S cmd -- $test
-      done
-
-      async -s=$S wait
-      rm $S
-    '';
-in
-  executeAll