diff --git a/master_changes.md b/master_changes.md
index cbc6f39abd5..f0684e2580b 100644
--- a/master_changes.md
+++ b/master_changes.md
@@ -104,6 +104,27 @@ users)
 
 ## Reftests
 ### Tests
+  * cli versioning: untie output from current major version [#6045 @rjbou]
+  * Set `opam-version` to 2.2 for some conflict message tests based on opam repository to stabilise their output [#6045 @rjbou]
+  * [BUG]: head -c is not posix compliant. Use cut -b instead. [#5989 @madroach]
+  * Add bad cudf package name encoding (dose3 lib) [#6055 @rjbou]
+  * Add test for filter operators in opam file [#5642 @rjbou]
+  * Update init test to make it no repo [#5327 @rjbou]
+  * Add a test in admin cache for hash cache [#6103 @rjbou]
+  * Add admin cache test [#6068 @rjbou]
+  * env: Add a test for `build-env` overwrites build env opam environment variables [#5377 @rjbou]
+  * clean: Add to check cleaning of sources directories [#5474 @rjbou]
+  * Add reftest for `--verbose-on` option [#5682 @rjbou]
+  * Add a test for --deps-only setting direct dependencies as root packages [#6125 @rjbou]
+  * Add a test file for `opam install --check` [#6121 @kit-ty-kate]
+  * Add reinstall test for delayed removal of packages [#6139 @rjbou]
+  * Add a test showing the behaviour of `opam list --latests-only` [#5375 @kit-ty-kate]
+  * Add a test filtering mechanism [#6105 @Keryan-dev]
+  * Add a package fetching test [#6146 @rjbou]
+  * Add a test showing the behaviour of `opam switch list-available` [#6098 @kit-ty-kate]
+  * Add a test for git packages with submodules [#6132 @kit-ty-kate]
+  * Add basic test for `install --check` [#6122 @rjbou]
+  * Add a sandbox usage test [#6165 @rjbou]
 
 ### Engine
 
diff --git a/tests/reftests/dune.inc b/tests/reftests/dune.inc
index 643bbb93218..395d32284b5 100644
--- a/tests/reftests/dune.inc
+++ b/tests/reftests/dune.inc
@@ -1574,6 +1574,27 @@
    %{targets}
    (run ./run.exe %{exe:../../src/client/opamMain.exe.exe} %{dep:resolve-variables.test} %{read-lines:testing-env}))))
 
+(rule
+ (alias reftest-sandbox.unix)
+ (enabled_if (and (= %{os_type} "Unix") (or (<> %{env:TESTALL=1} 0) (= %{env:TESTN0REP0=0} 1))))
+ (action
+  (diff sandbox.unix.test sandbox.unix.out)))
+
+(alias
+ (name reftest)
+ (enabled_if (and (= %{os_type} "Unix") (or (<> %{env:TESTALL=1} 0) (= %{env:TESTN0REP0=0} 1))))
+ (deps (alias reftest-sandbox.unix)))
+
+(rule
+ (targets sandbox.unix.out)
+ (deps root-N0REP0)
+ (enabled_if (and (= %{os_type} "Unix") (or (<> %{env:TESTALL=1} 0) (= %{env:TESTN0REP0=0} 1))))
+ (package opam)
+ (action
+  (with-stdout-to
+   %{targets}
+   (run ./run.exe %{exe:../../src/client/opamMain.exe.exe} %{dep:sandbox.unix.test} %{read-lines:testing-env}))))
+
 (rule
  (alias reftest-shared-fetch)
  (enabled_if (and  (or (<> %{env:TESTALL=1} 0) (= %{env:TESTN0REP0=0} 1))))
diff --git a/tests/reftests/sandbox.unix.test b/tests/reftests/sandbox.unix.test
new file mode 100644
index 00000000000..e9b228b2bb9
--- /dev/null
+++ b/tests/reftests/sandbox.unix.test
@@ -0,0 +1,35 @@
+N0REP0
+### <pkg:echo.1>
+opam-version: "2.0"
+build: [ "echo" "SUCCESS" "|" "tee" "check-write" ]
+### <pkg:option.1>
+opam-version: "2.0"
+build: [ "opam" "option" "jobs=4" "--cli=2.1"]
+### <pkg:var.1>
+opam-version: "2.0"
+build: [ "opam" "config" "var" "prefix" ]
+### <pkg:tmp.1>
+opam-version: "2.0"
+build: [ "sh" "-c" "echo > /tmp/ech" ]
+### <pkg:tmpdir.1>
+opam-version: "2.0"
+build: [ "sh" "-c" "echo > $TMPDIR/ech" ]
+### opam switch create sdbx --empty
+### OPAMVERBOSE=2
+### opam install echo | grep "^\(\\+\|-) " | sed-cmd echo
++ echo "SUCCESS" "|" "tee" "check-write" (CWD=${BASEDIR}/OPAM/sdbx/.opam-switch/build/echo.1)
+- SUCCESS | tee check-write
+### opam install option | grep "^\(\\+\|-) " | sed-cmd opam
++ opam "option" "jobs=4" "--cli=2.1" (CWD=${BASEDIR}/OPAM/sdbx/.opam-switch/build/option.1)
+- 'opam option jobs=4 --cli=2.1' failed.
+- Fatal error:
+- ${OPAM}: "open" failed on ${BASEDIR}/OPAM/config.lock: Read-only file system
+- No changes have been performed
+# Return code 31 #
+### opam install var | grep "^\(\\+\|-) " | sed-cmd opam
++ opam "config" "var" "prefix" (CWD=${BASEDIR}/OPAM/sdbx/.opam-switch/build/var.1)
+- ${BASEDIR}/OPAM/sdbx
+### opam install tmp | grep "^\(\\+\|-) " | sed-cmd sh
++ sh "-c" "echo > /tmp/ech" (CWD=${BASEDIR}/OPAM/sdbx/.opam-switch/build/tmp.1)
+### opam install tmpdir | grep "^\(\\+\|-) " | sed-cmd sh
++ sh "-c" "echo > $TMPDIR/ech" (CWD=${BASEDIR}/OPAM/sdbx/.opam-switch/build/tmpdir.1)