test: reproduce ocaml#4162

cram doesn't like spaces in paths

Signed-off-by: Rudi Grinberg <me@rgrinberg.com>

Author: rgrinberg

test/blackbox-tests/test-cases/gh4162.t

@@ -0,0 +1,21 @@
+Cram doesn't like tests in paths
+
+  $ mkdir "aaa bbb" && cd "aaa bbb"
+  $ cat >dune-project <<EOF
+  > (lang dune 3.0)
+  > (cram enable)
+  > EOF
+
+  $ cat >foo.t <<EOF
+  >   $ echo foo
+  > EOF
+
+  $ cat foo.t
+    $ echo foo
+
+  $ dune build @foo
+            sh (internal) (exit 1)
+  (cd _build/.sandbox/54ffcedad804d81955c7b33d18d42e68/default && /run/current-system/sw/bin/sh /var/folders/nc/x9_nmmsj0rjbfyzxb_kjk6qr0000gn/T/build_95f84b_dune/dune_cram_01b015_.foo.t/main.sh)
+  /var/folders/nc/x9_nmmsj0rjbfyzxb_kjk6qr0000gn/T/build_95f84b_dune/dune_cram_01b015_.foo.t/main.sh: line 5: printf: bbb/_build/.sandbox/54ffcedad804d81955c7b33d18d42e68/default:$TESTCASE_ROOT=$TESTCASE_ROOT/aaa: invalid number
+  -> required by alias foo
+  [1]