unikernel/duniverse/dune_/test/blackbox-tests/test-cases/no-dune-project.t

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+When no dune-project file is present, a warning is printed.
+
+  $ touch dune
+  $ dune build
+  File ".", line 1, characters 0-0:
+  Warning: No dune-project file has been found in directory ".". A default one
+  is assumed but the project might break when dune is upgraded. Please create a
+  dune-project file.
+  Hint: generate the project file with: $ dune init project <name>
+
+In release mode, this is fatal.
+
+  $ dune build --release
+  File ".", line 1, characters 0-0:
+  Error: No dune-project file has been found in directory ".". A default one is
+  assumed but the project might break when dune is upgraded. Please create a
+  dune-project file.
+  Hint: generate the project file with: $ dune init project <name>
+  [1]
+
+This corresponds to a flag:
+
+  $ dune build --require-dune-project-file
+  File ".", line 1, characters 0-0:
+  Error: No dune-project file has been found in directory ".". A default one is
+  assumed but the project might break when dune is upgraded. Please create a
+  dune-project file.
+  Hint: generate the project file with: $ dune init project <name>
+  [1]
+
+Test case: warning should be emitted
+
+  $ mkdir nested-case && cd nested-case
+  $ mkdir a && touch a/dune
+  $ dune build
+  File ".", line 1, characters 0-0:
+  Warning: No dune-project file has been found in directory ".". A default one
+  is assumed but the project might break when dune is upgraded. Please create a
+  dune-project file.
+  Hint: generate the project file with: $ dune init project <name>
+  $ cd ..
+
+Test case: warning should not be emitted
+
+  $ mkdir another-case && cd another-case
+  $ mkdir a && touch a/dune
+  $ echo "(lang dune 3.0)" > a/dune-project
+  $ cp -R a b
+  $ dune build
+  $ cd ..