Add cram test to show that custom build dirs work

Signed-off-by: Marek Kubica <[email protected]>

Author: Leonidas-from-XIV

test/blackbox-tests/test-cases/pkg/ocamlformat/ocamlformat-custom-build-dir.t

@@ -0,0 +1,48 @@
+Checks whether dev-tool locking takes custom build directories correctly into account.
+
+  $ . ./helpers.sh
+
+Set up some ocamlformat that we want to install.
+
+  $ ocamlformat_version="0.26.2"
+  $ make_fake_ocamlformat "${ocamlformat_version}"
+  $ make_ocamlformat_opam_pkg "${ocamlformat_version}"
+
+  $ cat > .ocamlformat <<EOF
+  > version = ${ocamlformat_version}
+  > EOF
+
+Override the build directory that we want to build in. We do this by replacing
+the build directory in `$dev_tool_lock_dir` with our custom build directory.
+
+  $ default_build_dir="_build"
+  $ custom_build_dir="_other_build"
+  $ default_dev_tool_lock_dir="${dev_tool_lock_dir}"
+  $ dev_tool_lock_dir="${dev_tool_lock_dir/#$default_build_dir/$custom_build_dir}"
+
+Create a configuration with this custom build directory
+
+  $ make_project_with_dev_tool_lockdir
+  $ enable_pkg
+
+Make sure we don't have a lock dir
+
+  $ [ -e "${dev_tool_lock_dir}"/lock.dune ] || echo "Lock dir does not exist in custom location"
+  Lock dir does not exist in custom location
+  $ [ -e "${default_dev_tool_lock_dir}"/lock.dune ] || echo "Lock dir does not exist in default location"
+  Lock dir does not exist in default location
+
+Install our fake ocamlformat, making sure to override the build directory.
+
+  $ dune tools install ocamlformat --build-dir="${custom_build_dir}"
+  Solution for _other_build/.dev-tools.locks/ocamlformat:
+  - ocamlformat.0.26.2
+
+This should've worked and picked up our ocamlformat using the lock dir
+configuration from the dune-workspace. But also, we should now have a lock dir
+at the right location, in our custom build dir.
+
+  $ [ -e "${dev_tool_lock_dir}"/lock.dune ] && echo "Lock dir created correct, custom location"
+  Lock dir created correct, custom location
+  $ [ -e "${default_dev_tool_lock_dir}"/lock.dune ] || echo "Lock dir does not exist in default location"
+  Lock dir does not exist in default location