unikernel/duniverse/dune_/test/blackbox-tests/test-cases/dune-cache/default-cache.t

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+The dune cache should be enabled by default
+
+  $ echo "(lang dune 3.17)" > dune-project
+
+  $ cat > dune << EOF
+  > (library
+  >  (name foo))
+  > EOF
+
+  $ cat > foo.ml << EOF
+  > let f x y = x + y
+  > EOF
+
+Set up cache directory
+
+  $ export DUNE_CACHE_ROOT=$(pwd)/dune_test_cache
+  $ mkdir $DUNE_CACHE_ROOT
+  $ DUNE_CACHE=disabled dune build
+  $ ls $DUNE_CACHE_ROOT
+
+We have not written anything to the cache yet.
+
+Change source files to force a recompilation
+
+  $ cat > foo.ml << EOF
+  > let f x y = x - y
+  > EOF
+  $ dune build
+  $ ls $DUNE_CACHE_ROOT | sort
+  files
+  meta
+  temp
+  values
+
+Cache has been written to!