Add a basic fuzzing test

tests/fuzzing_test.nim

@@ -0,0 +1,12 @@
+import
+  testutils/fuzzing,
+  ../zxcvbn
+
+proc toString(data: openarray[byte]): string =
+  result = newString(data.len)
+  if data.len > 0:
+    copyMem(addr result[0], unsafeAddr data[0], data.len)
+
+test:
+  let entropy = passwordEntropy(toString payload)
+

tests/test_all.nim

@@ -16,5 +16,9 @@ doAssert strongPassword > fourWords
 doAssert fourWords > remixedLongWord
 doAssert remixedLongWord > remixedQwerty
 doAssert remixedQwerty > abracadabra
+doAssert remixedQwerty > qwerty
+doAssert remixedQwerty > cat
+doAssert remixedQwerty > a
+doAssert remixedQwerty > longRepeatingSequence
 
 echo "SUCCESS"