diff --git a/tests/unittests/check-collectors.m4 b/tests/unittests/check-collectors.m4
new file mode 100644
index 0000000..6be3fb0
--- /dev/null
+++ b/tests/unittests/check-collectors.m4
@@ -0,0 +1,12 @@
+m4_include([collectors.m4])
+
+m4_include([test-support.m4])
+
+
+m4_define([SAVE], [m4_define([SAVED], [$1])])
+
+GET_NEGATION_PREFIX([BOMB], [SAVE])
+assert_equals(SAVED, _FORMAT_MISSING_PREFIX([BOMB]))
+
+STORE_NEGATION_PREFIX([lol], [BOMB])
+assert_equals(GET_NEGATION_PREFIX([lol]), [BOMB])