Adds test about filesize keyword

diff --git a/tests/filesize-keyword/README.md b/tests/filesize-keyword/README.md
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+# Description
+
+Test filesize keyword
+
+# PCAP
+
+The pcap is the same as smb-eicar-file test with the eicar file in it

diff --git a/tests/filesize-keyword/input.pcap b/tests/filesize-keyword/input.pcap
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Binary files /dev/null and b/tests/filesize-keyword/input.pcap differ

diff --git a/tests/filesize-keyword/test.rules b/tests/filesize-keyword/test.rules
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+++ b/tests/filesize-keyword/test.rules
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+alert tcp any any -> any any (filesize:<70; sid:1234;)
+alert tcp any any -> any any (filesize:>50; sid:1235;)

diff --git a/tests/filesize-keyword/test.yaml b/tests/filesize-keyword/test.yaml
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+# disables checksum verification
+args:
+- -k none
+
+checks:
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 1234
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 1235