unikernel/duniverse/dune_/test/blackbox-tests/test-cases/mdx-stanza/preludes.t/README.md

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+Using the mdx stanza, you can set mdx prelude which are used to evaluate
+code in the toplevel environments before checking a document. To do that
+you can set the prelude field of the stanza: `(preludes <prelude_file> ...)`.
+
+```ocaml
+# x;;
+- : int = 1
+```
+
+Different environment can have their own prelude. This is set using the
+`(env <env_name> <prelude_file>)` syntax for the prelude field.
+Here x and why are set in `alt.ml`.
+
+```ocaml env=a
+# x + y;;
+- : int = 11
+```
+
+```ocaml env=b
+# x + y;;
+- : int = 21
+```

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/mdx-stanza/preludes.t/a.ml

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+let y = 10

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/mdx-stanza/preludes.t/b.ml

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+let y = 20

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/mdx-stanza/preludes.t/default.ml

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+let x = 1

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/mdx-stanza/preludes.t/dune

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+(mdx
+ (files README.md)
+ (preludes
+  default.ml
+  (env a a.ml)
+  (env b b.ml)))

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/mdx-stanza/preludes.t/dune-project

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+(lang dune 2.4)
+
+(using mdx 0.1)

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/mdx-stanza/preludes.t/run.t

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+You can set MDX preludes using the preludes field of the stanza
+
+  $ dune runtest