detect: add test for email.subject keyword

Ticket: #7595

diff --git a/tests/detect-email-subject/README.md b/tests/detect-email-subject/README.md
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+++ b/tests/detect-email-subject/README.md
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+# Test Description
+Test mime email.subject keyword
+
+## PCAP
+From ../mime/mime-dec-parse-full-msg-test02/input.pcap
+
+## Redmine Ticket
+https://redmine.openinfosecfoundation.org/issues/7595

diff --git a/tests/detect-email-subject/test.rules b/tests/detect-email-subject/test.rules
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+++ b/tests/detect-email-subject/test.rules
@@ -0,0 +1 @@
+alert smtp any any -> any any (msg:"Test mime email subject"; email.subject; content:"This is a test email"; startswith; endswith; bsize:20; sid:1;)

diff --git a/tests/detect-email-subject/test.yaml b/tests/detect-email-subject/test.yaml
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+++ b/tests/detect-email-subject/test.yaml
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+requires:
+  min-version: 8
+
+pcap: ../mime/mime-dec-parse-full-msg-test02/input.pcap
+
+args:
+  - -k none --set stream.inline=true
+
+checks:
+- filter:
+    count: 1
+    match:
+      event_type: alert
+      pcap_cnt: 13
+      alert.signature_id: 1