pf tests: Test adding counters to an existing table

MFC after:	2 weeks
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D34132

tests/sys/netpfil/pf/table.sh

@@ -242,6 +242,42 @@ pr259689_cleanup()
 	pft_cleanup
 }
 
+atf_test_case "precreate" "cleanup"
+precreate_head()
+{
+	atf_set descr 'Test creating a table without counters, then loading rules that add counters'
+	atf_set require.user root
+}
+
+precreate_body()
+{
+	pft_init
+
+set -x
+	vnet_mkjail alcatraz
+
+	jexec alcatraz pfctl -t foo -T add 192.0.2.1
+	jexec alcatraz pfctl -t foo -T show
+
+	pft_set_rules noflush alcatraz \
+		"table <foo> counters persist" \
+		"pass in from <foo>"
+
+	# Expect all counters to be zero
+	atf_check -s exit:0 -e ignore \
+	    -o match:'In/Block:.*'"$TABLE_STATS_ZERO_REGEXP" \
+	    -o match:'In/Pass:.*'"$TABLE_STATS_ZERO_REGEXP" \
+	    -o match:'Out/Block:.*'"$TABLE_STATS_ZERO_REGEXP" \
+	    -o match:'Out/Pass:.*'"$TABLE_STATS_ZERO_REGEXP" \
+	    jexec alcatraz pfctl -t foo -T show -vv
+
+}
+
+precreate_cleanup()
+{
+	pft_cleanup
+}
+
 atf_init_test_cases()
 {
 	atf_add_test_case "v4_counters"
@@ -250,4 +286,5 @@ atf_init_test_cases()
 	atf_add_test_case "automatic"
 	atf_add_test_case "network"
 	atf_add_test_case "pr259689"
+	atf_add_test_case "precreate"
 }