add test for previous payload filter

tests/acceptance/test_saved_filter.py

@@ -0,0 +1,26 @@
+import pytest
+import os
+import tempfile
+
+import wfuzz
+
+
+def get_temp_file():
+    temp_name = next(tempfile._get_candidate_names())
+    defult_tmp_dir = tempfile._get_default_tempdir()
+
+    return os.path.join(defult_tmp_dir, temp_name)
+
+
+def test_filter_prev_payload():
+
+    filename = get_temp_file()
+    for res in wfuzz.get_session("-z range --zD 0-0 -H test:1 -u http://localhost:9000/anything/FUZZ").fuzz(save=filename):
+        pass
+
+    filename_new = get_temp_file()
+    for res in wfuzz.get_session("-z wfuzzp --zD {} -u FUZZ -H test:2 --oF {}".format(filename, filename_new)).fuzz(save=filename_new):
+        pass
+
+    assert len(list(wfuzz.get_session("-z wfuzzp --zD {} --slice r.headers.request.test=2 --dry-run -u FUZZ".format(filename_new)).fuzz())) == 1
+    assert len(list(wfuzz.get_session("-z wfuzzp --zD {} --slice FUZZ[r.headers.request.test]=1 --dry-run -u FUZZ".format(filename_new)).fuzz())) == 1