unikernel/duniverse/dune_/test/blackbox-tests/test-cases/promote/promote-file-to-dir.t

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+Demonstrate issue https://github.com/ocaml/dune/issues/7383 with changing a file for
+promotion from a file to a directory whilst in the staging area. This causes Dune to get
+confused and stuck.
+
+Create a cram test:
+
+  $ cat > dune-project << EOF
+  > (lang dune 3.8)
+  > EOF
+
+  $ cat > my_cram.t << EOF
+  >   $ echo hello
+  > EOF
+
+Run the cram test, should fail and file should be staged for promotion
+
+  $ dune build @runtest
+  File "my_cram.t", line 1, characters 0-0:
+  Error: Files _build/default/my_cram.t and _build/default/my_cram.t.corrected
+  differ.
+  [1]
+
+Change cram test to a directory cram test
+
+  $ rm my_cram.t
+  $ mkdir my_cram.t
+  $ cat > my_cram.t/run.t << EOF
+  >   $ echo hello
+  > EOF
+
+Run the cram test, should fail and file should be promoted
+
+  $ dune build @runtest 2>&1 | sed -E 's#/.*.sandbox/[^/]+#/.sandbox/$SANDBOX#g'
+  File "my_cram.t/run.t", line 1, characters 0-0:
+  Error: Files _build/default/my_cram.t/run.t and
+  _build/default/my_cram.t/run.t.corrected differ.
+  Error: rename(_build/default/my_cram.t/run.t.corrected): Not a directory
+  -> required by alias my_cram
+  -> required by alias runtest
+
+We cannot promote:
+
+  $ dune promote