TESTS: quic: create first quic unittest

Define a first unit-test dedicated to QUIC. A single test for now
ensures that variable length decoding is compliant. This should be
extended in the future with new set of tests.

Makefile

@@ -657,7 +657,7 @@ OPTIONS_OBJS += src/mux_quic.o src/h3.o src/quic_rx.o src/quic_tx.o	\
                 src/quic_cc_nocc.o src/quic_cc.o src/quic_pacing.o	\
                 src/h3_stats.o src/quic_stats.o src/qpack-enc.o		\
                 src/qpack-tbl.o src/quic_cc_drs.o src/quic_fctl.o	\
-                src/cbuf.o
+                src/cbuf.o src/quic_enc.o
 endif
 
 ifneq ($(USE_QUIC_OPENSSL_COMPAT:0=),)

src/quic_enc.c

@@ -0,0 +1,32 @@
+#include <haproxy/quic_enc.h>
+
+#include <haproxy/api.h>
+
+int quic_enc_unittest(int argc, char **argv)
+{
+	const uint8_t init = 4;
+
+	uint64_t val = 0;
+	struct buffer b;
+	char area[12];
+	size_t len;
+
+	int ret = 1;
+
+	b = b_make(area, sizeof(area), sizeof(area) - 2, 0);
+	/* encode an 8-bit integer as a 4 bytes long varint */
+	b_putblk(&b, (char[]){0x80, 0x00, 0x00, init}, 4);
+	/* ensure encoded data is wrapping inside buffer */
+	BUG_ON(b_data(&b) != b_contig_data(&b, b_head_ofs(&b)));
+
+	/* test that b_quic_dec_int() can decode a wrapping value */
+	b_quic_dec_int(&val, &b, &len);
+	if (val != init)
+		goto out;
+
+	ret = 0;
+
+ out:
+	return ret;
+}
+REGISTER_UNITTEST("quic_enc", quic_enc_unittest);

tests/unit/quic/quic.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+check() {
+	${HAPROXY_PROGRAM} -vv | grep -E '^Unit tests list :' | grep -q "quic"
+}
+
+run() {
+	${HAPROXY_PROGRAM} -U quic_enc
+}
+
+case "$1" in
+	"check")
+		check
+	;;
+	"run")
+		run
+	;;
+esac