Adds test for negated content and absent buffer

tests/detect-negated-content-absent-buffer/README.md

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+# Test Description
+
+Test rules with negated content on buffers that are absent
+
+## PCAP
+
+From the issue https://redmine.openinfosecfoundation.org/issues/2224
+
+## Related issues
+
+https://redmine.openinfosecfoundation.org/issues/2224

tests/detect-negated-content-absent-buffer/test.rules

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+# Test to ensure it works without a negated content
+# This signature should alert with _any_  pcap
+alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"TP test for URI"; flow:established,to_server; http.uri; bsize:1; content:"/"; sid:1;)
+
+# Test to prove FN when Referer is not included
+alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"FN test for Referer"; flow:established,to_server; http.uri; bsize:1; content:"/"; http.referer; content:!"example"; sid:6;)

tests/detect-negated-content-absent-buffer/test.yaml

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+requires:
+  min-version: 8
+
+args:
+- -k none
+
+checks:
+- filter:
+    count: 1
+    match:
+      event_type: alert
+      alert.signature_id: 1
+- filter:
+    count: 1
+    match:
+      event_type: alert
+      alert.signature_id: 6