unikernel/duniverse/dune_/test/blackbox-tests/test-cases/melange/dune-rules.t

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+Test dune rules
+
+  $ cat > dune-project <<EOF
+  > (lang dune 3.8)
+  > (using melange 0.1)
+  > EOF
+
+  $ cat > dune <<EOF
+  > (melange.emit
+  >  (target output)
+  >  (emit_stdlib false)
+  >  (modules main))
+  > EOF
+
+  $ cat > main.ml <<EOF
+  > Js.log "hello"
+  > EOF
+
+Calling dune rules with the 'all' alias works fine
+
+  $ dune rules @all | grep In_build_dir
+      (In_build_dir _build/default/.output.mobjs/melange/melange__Main.cmj))))
+
+Calling dune rules with the alias works fine
+
+  $ dune rules @melange | grep In_build_dir
+      (In_build_dir _build/default/.output.mobjs/melange/melange__Main.cmj))))
+
+Using output folder fails
+
+  $ dune rules output
+  Error: Don't know how to build output
+  [1]
+
+Creating dir fixes the problem
+
+  $ mkdir output
+
+  $ dune rules output | grep "\.cmj"
+      (In_build_dir _build/default/.output.mobjs/melange/melange__Main.cmj))))
+      .output.mobjs/melange/melange__Main.cmj))))