[PATCH v6 3/3] tests: shell: add JSON test for handle-based rule positioning

[Alexandre Knecht <knecht.alexandre@gmail.com>]

Add comprehensive test for JSON handle-based rule positioning to verify
the handle field correctly positions rules with explicit add/insert
commands while being ignored in implicit format.

Test coverage:
1. ADD with handle positions AFTER the specified handle
2. INSERT with handle positions BEFORE the specified handle
3. INSERT without handle positions at beginning
4. Multiple commands in single transaction (batch behavior)
5. Implicit format ignores handle field for portability

The test uses sed for handle extraction and nft -f format for setup
as suggested in code review. Final state is a table with two rules
from the implicit format test.

Signed-off-by: Alexandre Knecht <knecht.alexandre@gmail.com>
---
 .../testcases/json/0008rule_position_handle_0 | 162 ++++++++++++++++++
 .../dumps/0008rule_position_handle_0.json-nft |  76 ++++++++
 .../json/dumps/0008rule_position_handle_0.nft |   6 +
 3 files changed, 244 insertions(+)
 create mode 100755 tests/shell/testcases/json/0008rule_position_handle_0
 create mode 100644 tests/shell/testcases/json/dumps/0008rule_position_handle_0.json-nft
 create mode 100644 tests/shell/testcases/json/dumps/0008rule_position_handle_0.nft

diff --git a/tests/shell/testcases/json/0008rule_position_handle_0 b/tests/shell/testcases/json/0008rule_position_handle_0
new file mode 100755
index 00000000..32a3752c
--- /dev/null
+++ b/tests/shell/testcases/json/0008rule_position_handle_0
@@ -0,0 +1,162 @@
+#!/bin/bash
+
+# NFT_TEST_REQUIRES(NFT_TEST_HAVE_json)
+
+# Test JSON handle-based rule positioning
+# Verifies explicit format uses handle for positioning while implicit format ignores it
+
+set -e
+
+$NFT flush ruleset
+
+echo "Test 1: ADD with handle positions AFTER"
+$NFT -f - <<EOF
+table inet test {
+	chain c {
+		tcp dport 22 accept
+		tcp dport 80 accept
+	}
+}
+EOF
+
+# Get handle of first rule (tcp dport 22)
+HANDLE=$($NFT -a list chain inet test c | sed -n 's/.*tcp dport 22 .* handle \([0-9]\+\)/\1/p')
+
+# Add after handle (should be between 22 and 80)
+$NFT -j -f - <<EOF
+{"nftables": [{"add": {"rule": {"family": "inet", "table": "test", "chain": "c", "handle": $HANDLE, "expr": [{"match": {"op": "==", "left": {"payload": {"protocol": "tcp", "field": "dport"}}, "right": 443}}, {"accept": null}]}}}]}
+EOF
+
+# Verify order: 22, 443, 80
+RULES=$($NFT list chain inet test c | grep -o "tcp dport [0-9]*")
+EXPECTED="tcp dport 22
+tcp dport 443
+tcp dport 80"
+
+if [ "$RULES" = "$EXPECTED" ]; then
+	echo "PASS: Rule added after handle"
+else
+	echo "FAIL: Expected order 22,443,80, got:"
+	echo "$RULES"
+	exit 1
+fi
+
+echo "Test 2: INSERT with handle positions BEFORE"
+$NFT flush ruleset
+$NFT -f - <<EOF
+table inet test {
+	chain c {
+		tcp dport 22 accept
+		tcp dport 80 accept
+	}
+}
+EOF
+
+# Get handle of second rule (tcp dport 80)
+HANDLE=$($NFT -a list chain inet test c | sed -n 's/.*tcp dport 80 .* handle \([0-9]\+\)/\1/p')
+
+# Insert before handle
+$NFT -j -f - <<EOF
+{"nftables": [{"insert": {"rule": {"family": "inet", "table": "test", "chain": "c", "handle": $HANDLE, "expr": [{"match": {"op": "==", "left": {"payload": {"protocol": "tcp", "field": "dport"}}, "right": 443}}, {"accept": null}]}}}]}
+EOF
+
+# Verify order: 22, 443, 80
+RULES=$($NFT list chain inet test c | grep -o "tcp dport [0-9]*")
+if [ "$RULES" = "$EXPECTED" ]; then
+	echo "PASS: Rule inserted before handle"
+else
+	echo "FAIL: Expected order 22,443,80, got:"
+	echo "$RULES"
+	exit 1
+fi
+
+echo "Test 3: INSERT without handle positions at beginning"
+$NFT flush ruleset
+$NFT -f - <<EOF
+table inet test {
+	chain c {
+		tcp dport 22 accept
+		tcp dport 80 accept
+	}
+}
+EOF
+
+# Insert without handle (should go to beginning)
+$NFT -j -f - <<EOF
+{"nftables": [{"insert": {"rule": {"family": "inet", "table": "test", "chain": "c", "expr": [{"match": {"op": "==", "left": {"payload": {"protocol": "tcp", "field": "dport"}}, "right": 443}}, {"accept": null}]}}}]}
+EOF
+
+# Verify order: 443, 22, 80
+RULES=$($NFT list chain inet test c | grep -o "tcp dport [0-9]*")
+EXPECTED_INSERT="tcp dport 443
+tcp dport 22
+tcp dport 80"
+
+if [ "$RULES" = "$EXPECTED_INSERT" ]; then
+	echo "PASS: Rule inserted at beginning without handle"
+else
+	echo "FAIL: Expected order 443,22,80, got:"
+	echo "$RULES"
+	exit 1
+fi
+
+echo "Test 4: Multiple commands in single transaction"
+$NFT flush ruleset
+$NFT -f - <<EOF
+table inet test {
+	chain c {
+		tcp dport 22 accept
+	}
+}
+EOF
+
+# Get handle
+HANDLE=$($NFT -a list chain inet test c | sed -n 's/.*tcp dport 22 .* handle \([0-9]\+\)/\1/p')
+
+# Add two rules after same handle in single transaction
+$NFT -j -f - <<EOF
+{"nftables": [
+	{"add": {"rule": {"family": "inet", "table": "test", "chain": "c", "handle": $HANDLE, "expr": [{"match": {"op": "==", "left": {"payload": {"protocol": "tcp", "field": "dport"}}, "right": 80}}, {"accept": null}]}}},
+	{"add": {"rule": {"family": "inet", "table": "test", "chain": "c", "handle": $HANDLE, "expr": [{"match": {"op": "==", "left": {"payload": {"protocol": "tcp", "field": "dport"}}, "right": 443}}, {"accept": null}]}}}
+]}
+EOF
+
+# Verify: Both should be after handle 22
+# In a transaction, both position to same handle, so added in reverse order
+# Order should be: 22, then 443, then 80 (last add goes immediately after position)
+RULES=$($NFT list chain inet test c | grep -o "tcp dport [0-9]*")
+EXPECTED_MULTI="tcp dport 22
+tcp dport 443
+tcp dport 80"
+
+if [ "$RULES" = "$EXPECTED_MULTI" ]; then
+	echo "PASS: Multiple rules in transaction positioned correctly"
+else
+	echo "FAIL: Expected order 22,443,80, got:"
+	echo "$RULES"
+	exit 1
+fi
+
+echo "Test 5: Implicit format ignores handle"
+$NFT flush ruleset
+$NFT -f - <<EOF
+table inet test {
+	chain c {
+		tcp dport 22 accept
+	}
+}
+EOF
+
+# Implicit format with non-existent handle should succeed (handle ignored)
+$NFT -j -f - <<EOF
+{"nftables": [{"rule": {"family": "inet", "table": "test", "chain": "c", "handle": 9999, "expr": [{"match": {"op": "==", "left": {"payload": {"protocol": "tcp", "field": "dport"}}, "right": 80}}, {"accept": null}]}}]}
+EOF
+
+if $NFT list chain inet test c | grep -q "tcp dport 80"; then
+	echo "PASS: Implicit format ignores handle"
+else
+	echo "FAIL: Implicit format should have added rule despite non-existent handle"
+	exit 1
+fi
+
+echo "All positioning tests passed!"
diff --git a/tests/shell/testcases/json/dumps/0008rule_position_handle_0.json-nft b/tests/shell/testcases/json/dumps/0008rule_position_handle_0.json-nft
new file mode 100644
index 00000000..62101fbb
--- /dev/null
+++ b/tests/shell/testcases/json/dumps/0008rule_position_handle_0.json-nft
@@ -0,0 +1,76 @@
+{
+  "nftables": [
+    {
+      "metainfo": {
+        "version": "VERSION",
+        "release_name": "RELEASE_NAME",
+        "json_schema_version": 1
+      }
+    },
+    {
+      "table": {
+        "family": "inet",
+        "name": "test",
+        "handle": 0
+      }
+    },
+    {
+      "chain": {
+        "family": "inet",
+        "table": "test",
+        "name": "c",
+        "handle": 0
+      }
+    },
+    {
+      "rule": {
+        "family": "inet",
+        "table": "test",
+        "chain": "c",
+        "handle": 0,
+        "expr": [
+          {
+            "match": {
+              "op": "==",
+              "left": {
+                "payload": {
+                  "protocol": "tcp",
+                  "field": "dport"
+                }
+              },
+              "right": 22
+            }
+          },
+          {
+            "accept": null
+          }
+        ]
+      }
+    },
+    {
+      "rule": {
+        "family": "inet",
+        "table": "test",
+        "chain": "c",
+        "handle": 0,
+        "expr": [
+          {
+            "match": {
+              "op": "==",
+              "left": {
+                "payload": {
+                  "protocol": "tcp",
+                  "field": "dport"
+                }
+              },
+              "right": 80
+            }
+          },
+          {
+            "accept": null
+          }
+        ]
+      }
+    }
+  ]
+}
diff --git a/tests/shell/testcases/json/dumps/0008rule_position_handle_0.nft b/tests/shell/testcases/json/dumps/0008rule_position_handle_0.nft
new file mode 100644
index 00000000..d222ad64
--- /dev/null
+++ b/tests/shell/testcases/json/dumps/0008rule_position_handle_0.nft
@@ -0,0 +1,6 @@
+table inet test {
+	chain c {
+		tcp dport 22 accept
+		tcp dport 80 accept
+	}
+}
-- 
2.51.1