unikernel/duniverse/dune_/test/blackbox-tests/test-cases/cram/cram-setting-in-dune-project.t

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+Test the behavior when there are cram stanzas but cram tests are not enabled.
+
+We need a sub-directory, otherwise the inner dune will see this run.t
+file and we enter a loop:
+
+  $ mkdir test
+  $ cd test
+
+  $ cat >dune-project<<EOF
+  > (lang dune 2.8)
+  > EOF
+
+  $ cat >dune<<EOF
+  > (cram)
+  > EOF
+
+  $ cat >run.t<<EOF
+  >   $ echo "Hello, world!"
+  > EOF
+
+With older version of Dune, this would do nothing because of the
+missing (cram enable) in the dune-project file:
+
+  $ dune runtest
+  File "dune", line 1, characters 0-6:
+  1 | (cram)
+      ^^^^^^
+  Warning: Cram tests are not enabled in this project.
+  Hint: You can enable cram tests by adding (cram enable) to your dune-project
+  file.
+
+Check that once we enable cram tests, the test are indeed being
+executed:
+
+  $ echo "(cram enable)" >> dune-project
+  $ dune runtest
+  File "run.t", line 1, characters 0-0:
+  Error: Files _build/default/run.t and _build/default/run.t.corrected differ.
+  [1]
+
+With Dune 3.0 and later, we don't get an error since cram tests are enabled by
+default:
+
+  $ cat >dune-project<<EOF
+  > (lang dune 3.0)
+  > EOF
+
+  $ dune runtest
+  File "run.t", line 1, characters 0-0:
+  Error: Files _build/default/run.t and _build/default/run.t.corrected differ.
+  [1]
+
+And if we disable them on purpose, we get an error message:
+
+  $ echo "(cram disable)" >> dune-project
+  $ dune runtest
+  File "dune", line 1, characters 0-6:
+  1 | (cram)
+      ^^^^^^
+  Error: Cram tests are not enabled in this project.
+  Hint: You can enable cram tests by adding (cram enable) to your dune-project
+  file.
+  [1]