diff --git a/test/run.sh b/test/run.sh
index f805f14..cd72f62 100755
--- a/test/run.sh
+++ b/test/run.sh
@@ -23,6 +23,10 @@ run_test() {
 	local test_name="$1"
 	local test_action="$2"
 
+	export DIR_SRC="${HERE}/../src"
+	export DIR_BIN="${HERE}/../bin"
+	export DIR_LIB="${HERE}/../lib"
+
 	bash "$HERE/util/test-exec.sh" "$test_action" "$test_name"
 	return $?
 }
diff --git a/test/tests/lib.opt.sh b/test/tests/lib.opt.sh
new file mode 100644
index 0000000..fdc6f03
--- /dev/null
+++ b/test/tests/lib.opt.sh
@@ -0,0 +1,22 @@
+set -e
+source "${DIR_LIB}/opt.sh"
+
+setargs pos1 \
+	--val1 for_val1 \
+	--val2=for_val2 \
+	pos2 \
+	--flag1 \
+	-v4 for_val4 \
+	--flag2 \
+
+# Run a standard option parsing loop.
+while shiftopt; do
+	case "$OPT" in
+		--val*) shiftval; printf "LONG_OPTION:  \"%s\" with value \"%s\"\n" "${OPT}" "${OPT_VAL}" ;;
+		--*)              printf "LONG_FLAG:    \"%s\"\n" "${OPT}" ;;
+		-v*)    shiftval; printf "SHORT_OPTION: \"%s\" with value \"%s\"\n" "${OPT}" "${OPT_VAL}" ;;
+		-*)               printf "SHORT_FLAG:   \"%s\"\n" "${OPT}" ;;
+		*)                printf "ARGUMENT:     \"%s\"\n" "${OPT}" ;;
+	esac
+done
+
diff --git a/test/tests/lib.opt.snapshot b/test/tests/lib.opt.snapshot
new file mode 100644
index 0000000..fd872ed
--- /dev/null
+++ b/test/tests/lib.opt.snapshot
@@ -0,0 +1,7 @@
+ARGUMENT:     "pos1"
+LONG_OPTION:  "--val1" with value "for_val1"
+LONG_OPTION:  "--val2" with value "for_val2"
+ARGUMENT:     "pos2"
+LONG_FLAG:    "--flag1"
+SHORT_OPTION: "-v4" with value "for_val4"
+LONG_FLAG:    "--flag2"