detect: adds test with bsize:0

diff --git a/tests/detect-bsize-0/README.md b/tests/detect-bsize-0/README.md
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+++ b/tests/detect-bsize-0/README.md
@@ -0,0 +1,9 @@
+# Description
+
+Test `bsize` keyword with 0 value
+cf https://redmine.openinfosecfoundation.org/issues/6025
+
+# PCAP
+
+Pcap crafted with dummy HTTP server anc nc client to have an empty user-agent
+

diff --git a/tests/detect-bsize-0/input.pcap b/tests/detect-bsize-0/input.pcap
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index 0000000..b8cfce0
Binary files /dev/null and b/tests/detect-bsize-0/input.pcap differ

diff --git a/tests/detect-bsize-0/test.rules b/tests/detect-bsize-0/test.rules
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+++ b/tests/detect-bsize-0/test.rules
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+alert http any any -> any any (http.user_agent; bsize: 0; sid:46;)
+alert http any any -> any any (http.user_agent; content: !"u"; sid:47;)

diff --git a/tests/detect-bsize-0/test.yaml b/tests/detect-bsize-0/test.yaml
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+++ b/tests/detect-bsize-0/test.yaml
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+requires:
+    min-version: 7
+
+args:
+ - -k none
+
+checks:
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 46
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 47