add test cases

Signed-off-by: Haochen Kotoi-Xie <hx@kxc.inc>

test/blackbox-tests/test-cases/melange/aliases.t

@@ -43,6 +43,29 @@ Default alias melange works
   $ node _build/default/output2/main2.js
   hello
 
+Dune default alias works
+
+  $ cat > dune <<EOF
+  > (melange.emit
+  >  (target output)
+  >  (modules main))
+  > (melange.emit
+  >  (target output2)
+  >  (modules main2))
+  > EOF
+
+  $ cat > main2.ml <<EOF
+  > let () =
+  >   print_endline "hello"
+  > EOF
+
+  $ dune clean
+  $ dune build
+  $ node _build/default/output/main.js
+  hello
+  $ node _build/default/output2/main2.js
+  hello
+
 Users can override melange alias (even if useless)
 
   $ cat > dune <<EOF
@@ -67,3 +90,17 @@ If user defines an alias, the default alias is not used for that stanza
   Error: Alias "melange" specified on the command line is empty.
   It is not defined in . or any of its descendants.
   [1]
+
+If user defines an alias, dune default alias no longer works
+
+  $ cat > dune <<EOF
+  > (melange.emit
+  >  (target output)
+  >  (modules main)
+  >  (alias foo))
+  > EOF
+
+  $ dune clean
+  $ dune build
+  $ [[ -f _build/default/output/main.js ]]
+  [1]

test/blackbox-tests/test-cases/melange/dune-rules.t

@@ -16,6 +16,11 @@ Test dune rules
   > print_endline "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