test/entropy: Basic entropy keyword test

This commit adds a basic test of the entropy keyword.

diff --git a/tests/entropy/entropy-01/README.md b/tests/entropy/entropy-01/README.md
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+++ b/tests/entropy/entropy-01/README.md
@@ -0,0 +1 @@
+This test checks the entropy keyword with a comparison against HTTP file data.

diff --git a/tests/entropy/entropy-01/input.pcap b/tests/entropy/entropy-01/input.pcap
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index 0000000..c84b2df
Binary files /dev/null and b/tests/entropy/entropy-01/input.pcap differ

diff --git a/tests/entropy/entropy-01/test.rules b/tests/entropy/entropy-01/test.rules
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index 0000000..308d9ca
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+++ b/tests/entropy/entropy-01/test.rules
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+# The entropy value is 4.137370175000773
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: value > 4; sid:1;)
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: value >= 4; sid:2;)
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: value >= 5; sid:3;)
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: value 4-5; sid:4;)
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: value !4-5; sid:5;)
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: value < 4; sid:6;)
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: value != 4; sid:7;)
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: value = 4; sid:8;)
+# The entropy value is 4.150007324019584
+alert http any any -> any any (msg:"entropy simple test"; file.data; entropy: offset 10, value > 4.14; sid:10;)
+

diff --git a/tests/entropy/entropy-01/test.yaml b/tests/entropy/entropy-01/test.yaml
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+requires:
+  min-version: 8
+
+checks:
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 1
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 2
+  - filter:
+      count: 0
+      match:
+        event_type: alert
+        alert.signature_id: 3
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 4
+  - filter:
+      count: 0
+      match:
+        event_type: alert
+        alert.signature_id: 5
+  - filter:
+      count: 0
+      match:
+        event_type: alert
+        alert.signature_id: 6
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 7
+  - filter:
+      count: 0
+      match:
+        event_type: alert
+        alert.signature_id: 8
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 10