diff --git a/test-under-isolated-flox-PATH b/test-under-isolated-flox-PATH
new file mode 100755
index 000000000..b5a6f1614
--- /dev/null
+++ b/test-under-isolated-flox-PATH
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+set -euxo pipefail
+
+# Find flox (while PATH is still available)
+FLOX=$(which flox)
+
+# Clear PATH!
+PATH=
+
+# NOT source tools/flox
+$FLOX activate --mode=run
+
+echo "Now source ./test.bash ..."
+source ./test.bash
+
+# TODO or use something like:
+#   env -i flox activate -- source
diff --git a/test.bash b/test.bash
index 6b0b27b97..6e58189d0 100755
--- a/test.bash
+++ b/test.bash
@@ -1,4 +1,3 @@
-#!/usr/bin/env bash
 # SPDX-License-Identifier: Apache-2.0
 #
 # Copyright 2023-2025 The Enola <https://enola.dev> Authors
@@ -15,7 +14,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-set -euo pipefail
+set -euxo pipefail
+
+echo "test.bash: Yo!"
 
 # This script builds the project *WITHOUT* requiring containers.
 # It can be used *IN* a container though; and is so, by the ./build script.