unikernel/duniverse/dune_/test/blackbox-tests/test-cases/test-build-if/feature.t

@@ -0,0 +1,93 @@
+enabled_if and build_if have similar behavior on the test(s) stanza.
+build_if controls whether the tests builds, while enabled_if controls whether
+the test runs as part of @runtest
+
+
+  $ cat > dune-project << EOF
+  > (lang dune 3.9)
+  > EOF
+
+  $ cat > dune << EOF
+  > (test
+  >  (name t)
+  >  (enabled_if %{env:ENABLED=false}))
+  > EOF
+
+  $ compiled_flag="t compiled"
+  $ ran_flag="t ran"
+
+  $ cat > t.ml <<EOF
+  > module T : sig
+  >   val message : string
+  >   [@@alert message "$compiled_flag"]
+  > end = struct
+  >   let message = "$ran_flag"
+  > end
+  > 
+  > let () =
+  >   Printf.printf "%s" T.message
+  > ;;
+  > EOF
+
+We test the various combinations:
+
+  $ test_one () {
+  >   dune clean
+  >   output=$( dune build "$1" 2>&1 )
+  >   echo When building $1 with ENABLED=${ENABLED:-unset}:
+  >   if echo $output | grep -q "$compiled_flag" ; then
+  >     echo '  build was done: YES'
+  >   else
+  >     echo '  build was done: NO'
+  >   fi
+  >   if echo $output | grep -q "$ran_flag" ; then
+  >     echo '  test did run:   YES'
+  >   else
+  >     echo '  test did run:   NO'
+  >   fi
+  > }
+
+  $ test_all () {
+  >   test_one @all
+  >   test_one @runtest
+  >   ENABLED=true test_one @all
+  >   ENABLED=true test_one @runtest
+  > }
+
+  $ test_all
+  When building @all with ENABLED=unset:
+    build was done: YES
+    test did run:   NO
+  When building @runtest with ENABLED=unset:
+    build was done: NO
+    test did run:   NO
+  When building @all with ENABLED=true:
+    build was done: YES
+    test did run:   NO
+  When building @runtest with ENABLED=true:
+    build was done: YES
+    test did run:   YES
+
+Now with build_if:
+
+  $ cat > dune << EOF
+  > (test
+  >  (name t)
+  >  (build_if %{env:ENABLED=false}))
+  > EOF
+
+Notice that in the first case, nothing is done at all:
+
+  $ test_all
+  When building @all with ENABLED=unset:
+    build was done: NO
+    test did run:   NO
+  When building @runtest with ENABLED=unset:
+    build was done: NO
+    test did run:   NO
+  When building @all with ENABLED=true:
+    build was done: YES
+    test did run:   NO
+  When building @runtest with ENABLED=true:
+    build was done: YES
+    test did run:   YES