file: Add tests for file_data prefilter keyword

Tests the `prefilter` keyword for `file_data` and `file.data`

Ticket #5801

diff --git a/tests/file-data-prefilter/README.md b/tests/file-data-prefilter/README.md
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+Description
+===========
+Tests the `prefilter` keyword for `file_data` and `file.data`.
+
+PCAP
+====
+PCAP comes from an [existing file-data test](https://github.com/OISF/suricata-verify/blob/master/tests/file-data-depth-inspection/file-data-depth-inpsection.pcap)
+
+Redmine ticket
+==============
+https://redmine.openinfosecfoundation.org/issues/5801
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diff --git a/tests/file-data-prefilter/test.rules b/tests/file-data-prefilter/test.rules
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+# test prefilter keyword for file_data
+alert tcp any any -> any 25 (msg:"VIRUS INBOUND bad file attachment"; flow:to_server,established; content:"content-disposition|3a| attachment|3b|"; nocase; content:".zip|22|"; nocase; within:128; file_data; content:".pdf.exe"; prefilter; within:64; sid:1; rev:1;)
+# test prefilter keyword for file.data
+alert tcp any any -> any 25 (msg:"VIRUS INBOUND bad file attachment"; flow:to_server,established; content:"content-disposition|3a| attachment|3b|"; nocase; content:".zip|22|"; nocase; within:128; file.data; content:".pdf.exe"; prefilter; within:64; sid:2; rev:1;)
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diff --git a/tests/file-data-prefilter/test.yaml b/tests/file-data-prefilter/test.yaml
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+pcap: ../file-data-depth-inspection/file-data-depth-inpsection.pcap
+
+checks:
+    - filter:
+        count: 2
+        match:
+            event_type: alert
+            alert.signature_id: 1
+    - filter:
+        count: 2
+        match:
+            event_type: alert
+            alert.signature_id: 2
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