unikernel/duniverse/dune_/test/blackbox-tests/test-cases/watching/github4923.t

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+Reproduction case for #4923: weird things observed when we add/remove
+a file in watch mode.
+
+  $ . ./helpers.sh
+
+  $ echo '(lang dune 3.0)' > dune-project
+  $ mkdir a b
+  $ cat > a/dune <<EOF
+  > (library (name a))
+  > EOF
+  $ cat > b/dune <<EOF
+  > (library (name b))
+  > EOF
+  $ touch a/a.ml b/b.ml
+  $ cat > dune <<EOF
+  > (executable (name x) (libraries b))
+  > EOF
+  $ echo 'print_endline "Hello, world!"' > x.ml
+
+  $ start_dune
+
+  $ build x.exe
+  Success
+  $ _build/default/x.exe
+  Hello, world!
+
+In the past, adding a new file while Dune was running in watching mode
+was corrupting Dune's internal state. For instance, here it no longer
+knew how to build x.exe. This is now fixed.
+
+  $ touch b/blah
+
+  $ build x.exe
+  Success
+  $ _build/default/x.exe
+  Hello, world!
+
+  $ stop_dune
+  Success, waiting for filesystem changes...
+  Success, waiting for filesystem changes...