Test looks for "oUnit" but the module is actually called "ounit2".

markup-0.8.2-rename-ounit.patch

@@ -0,0 +1,31 @@
+diff -ur markup.ml-0.8.2.old/test/dune markup.ml-0.8.2/test/dune
+--- markup.ml-0.8.2.old/test/dune	2019-12-09 21:10:45.000000000 +0000
++++ markup.ml-0.8.2/test/dune	2020-02-26 18:50:33.352347296 +0000
+@@ -1,6 +1,6 @@
+ (executable
+  (name test)
+- (libraries markup oUnit test_support)
++ (libraries markup ounit2 test_support)
+  (flags (:standard -w +A-44-48)))
+ 
+ (alias
+diff -ur markup.ml-0.8.2.old/test/lwt_unix/dune markup.ml-0.8.2/test/lwt_unix/dune
+--- markup.ml-0.8.2.old/test/lwt_unix/dune	2019-12-09 21:10:45.000000000 +0000
++++ markup.ml-0.8.2/test/lwt_unix/dune	2020-02-26 18:50:27.299431528 +0000
+@@ -1,6 +1,6 @@
+ (executable
+  (name test_lwt)
+- (libraries lwt.unix markup-lwt.unix oUnit test_support)
++ (libraries lwt.unix markup-lwt.unix ounit2 test_support)
+  (flags (:standard -w +A-44)))
+ 
+ (alias
+diff -ur markup.ml-0.8.2.old/test/support/dune markup.ml-0.8.2/test/support/dune
+--- markup.ml-0.8.2.old/test/support/dune	2019-12-09 21:10:45.000000000 +0000
++++ markup.ml-0.8.2/test/support/dune	2020-02-26 18:50:48.344138661 +0000
+@@ -1,4 +1,4 @@
+ (library
+  (name test_support)
+- (libraries markup oUnit)
++ (libraries markup ounit2)
+  (flags (:standard -w +A-44)))

ocaml-markup.spec

@@ -13,6 +13,9 @@ License:        MIT
 URL:            http://aantron.github.io/markup.ml/
 Source0:        https://github.com/aantron/markup.ml/archive/%{version}/%{srcname}-%{version}.tar.gz
 
+# Test looks for "oUnit" but the module is actually called "ounit2".
+Patch1:         markup-0.8.2-rename-ounit.patch
+
 BuildRequires:  ocaml >= 4.02.0
 BuildRequires:  ocaml-bisect-ppx-devel
 BuildRequires:  ocaml-dune
@@ -73,7 +76,7 @@ The %{name}-lwt-devel package contains libraries and signature files for
 developing applications that use %{name}-lwt.
 
 %prep
-%autosetup -n %{srcname}.ml-%{version}
+%autosetup -n %{srcname}.ml-%{version} -p1
 
 # The uchar package is a forward compatibility package for OCaml versions prior
 # to 4.03.  We have a later OCaml in Fedora; uchar is in the standard library.