diff --git a/test-all-native.sh b/test-all-native.sh
index 4f55b83..c60e18c 100755
--- a/test-all-native.sh
+++ b/test-all-native.sh
@@ -39,6 +39,8 @@ missing_source_manifest=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_native_syntax_missing_
 missing_source_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_native_syntax_missing_source.XXXXXX.log")
 kinematics_unknown_filter_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_kinematics_manifest_unknown_filter.XXXXXX.log")
 kinematics_unknown_output_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_kinematics_manifest_unknown_output.XXXXXX.log")
+inputs_cached_missing_cache_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_inputs_cached_missing_cache_dir.XXXXXX.log")
+inputs_cached_whitespace_cache_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_inputs_cached_whitespace_cache_dir.XXXXXX.log")
 switchkins_checker_unknown_option_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_switchkins_checker_unknown_option.XXXXXX.log")
 switchkins_checker_too_many_args_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_switchkins_checker_too_many_args.XXXXXX.log")
 switchkins_cached_missing_cache_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_switchkins_cached_missing_cache_dir.XXXXXX.log")
@@ -95,6 +97,8 @@ cleanup_native_test_temps() {
         "$missing_source_log" \
         "$kinematics_unknown_filter_log" \
         "$kinematics_unknown_output_log" \
+        "$inputs_cached_missing_cache_dir_log" \
+        "$inputs_cached_whitespace_cache_dir_log" \
         "$switchkins_checker_unknown_option_log" \
         "$switchkins_checker_too_many_args_log" \
         "$switchkins_cached_missing_cache_dir_log" \
@@ -248,6 +252,8 @@ for forbidden_manual_cleanup in \
     'rm -f "$missing_source_manifest" "$missing_source_log"' \
     'rm -f "$kinematics_unknown_filter_log"' \
     'rm -f "$kinematics_unknown_output_log"' \
+    'rm -f "$inputs_cached_missing_cache_dir_log"' \
+    'rm -f "$inputs_cached_whitespace_cache_dir_log"' \
     'rm -f "$switchkins_checker_unknown_option_log"' \
     'rm -f "$switchkins_checker_too_many_args_log"' \
     'rm -f "$switchkins_cached_missing_cache_dir_log"' \
@@ -1382,6 +1388,26 @@ if ! grep -F "too many switchkins remap table checker arguments" "$switchkins_ch
     sed -n '1,20p' "$switchkins_checker_too_many_args_log" >&2
     exit 1
 fi
+if ./check-linuxcnc-inputs-cached.sh --cache-dir >"$inputs_cached_missing_cache_dir_log" 2>&1; then
+    echo "cached LinuxCNC input checker accepted --cache-dir without a value" >&2
+    exit 1
+fi
+if ! grep -F "missing --cache-dir value" "$inputs_cached_missing_cache_dir_log" >/dev/null; then
+    echo "cached LinuxCNC input checker did not report missing cache-dir values clearly" >&2
+    sed -n '1,20p' "$inputs_cached_missing_cache_dir_log" >&2
+    exit 1
+fi
+if ./check-linuxcnc-inputs-cached.sh --cache-dir "build/input cache" \
+    linuxcnc-rs274-source-files.txt >"$inputs_cached_whitespace_cache_dir_log" 2>&1; then
+    echo "cached LinuxCNC input checker accepted whitespace in cache dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_PREFLIGHT_CACHE_DIR must not contain whitespace: build/input cache" \
+    "$inputs_cached_whitespace_cache_dir_log" >/dev/null; then
+    echo "cached LinuxCNC input checker did not report whitespace cache dirs clearly" >&2
+    sed -n '1,20p' "$inputs_cached_whitespace_cache_dir_log" >&2
+    exit 1
+fi
 if ./check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir >"$switchkins_cached_missing_cache_dir_log" 2>&1; then
     echo "cached switchkins remap table checker accepted --cache-dir without a value" >&2
     exit 1