add tests for utf8 encoding with the suball() function

src/tests/encoding.vtc

@@ -237,3 +237,50 @@ client c1 {
 	expect resp.http.patternbytes == "fallback"
 	expect resp.http.patternchars == "z"
 } -run
+
+# suball() function
+
+varnish v1 -vcl {
+	import re2 from "${vmod_topbuild}/src/.libs/libvmod_re2.so";
+	backend b { .host = "${bad_ip}"; }
+
+	sub vcl_recv {
+		return(synth(200));
+	}
+
+	sub vcl_synth {
+		set resp.http.ninebytes =
+		  re2.suball("^.........$",
+		             {"日扼語"}, "z");
+		set resp.http.threechars =
+		  re2.suball("^...$",
+		             {"日扼語"}, "z",
+		             utf8=true);
+		set resp.http.bytes =
+		  re2.suball({"日扼語"},
+		             {"日扼語"}, "z");
+		set resp.http.chars =
+		  re2.suball({"日扼語"},
+		             {"日扼語"}, "z",
+			     utf8=true);
+		set resp.http.patternbytes =
+		  re2.suball({"^.扼.$"},
+		             {"日扼語"}, "z",
+			     fallback="fallback");
+		set resp.http.patternchars =
+		  re2.suball({"^.扼.$"},
+		             {"日扼語"}, "z",
+		             utf8=true);
+	}
+}
+
+client c1 {
+	txreq
+	rxresp
+	expect resp.http.ninebytes == "z"
+	expect resp.http.threechars == "z"
+	expect resp.http.bytes == "z"
+	expect resp.http.chars == "z"
+	expect resp.http.patternbytes == "fallback"
+	expect resp.http.patternchars == "z"
+} -run