Add more tests for backref failure.

src/tests/backref_basic.vtc

@@ -78,6 +78,28 @@ varnish v1 -vcl {
 		if (barbaz.match("barbaz")) {
 			set resp.http.bar0 = barbaz.backref(0, "error0");
 		}
+
+		# match fails
+		set resp.http.frob1 = frobnitz.match("barbaz");
+		# ... so all backrefs fail
+		set resp.http.frob1-0 = frobnitz.backref(0, "error0");
+		set resp.http.frob1-1 = frobnitz.backref(1, "error1");
+		set resp.http.frob1-2 = frobnitz.backref(2, "error2");
+
+		# match succeeds, then fails again
+		set resp.http.frob-yes = frobnitz.match("frobnitz");
+		set resp.http.frob-no = frobnitz.match("barbaz");
+		# ... so all backrefs fail, despite previous match
+		set resp.http.frob2-0 = frobnitz.backref(0, "error0");
+		set resp.http.frob2-1 = frobnitz.backref(1, "error1");
+		set resp.http.frob2-2 = frobnitz.backref(2, "error2");
+
+		# backref 2 is unset
+		set resp.http.azbc = azbc.match("abc");
+		set resp.http.azbc-0 = azbc.backref(0, "error0");
+		set resp.http.azbc-1 = azbc.backref(1, "error1");
+		set resp.http.azbc-2 = azbc.backref(2, "error2");
+		set resp.http.azbc-3 = azbc.backref(3, "error3");
 	}
 }
 
@@ -87,10 +109,31 @@ client c1 -repeat 2 {
 	expect resp.status == "200"
 	expect resp.http.nomatch == "fallback"
 	expect resp.http.bar0 == "barbaz"
+	expect resp.http.frob1 == "false"
+	expect resp.http.frob1-0 == "error0"
+	expect resp.http.frob1-1 == "error1"
+	expect resp.http.frob1-2 == "error2"
+	expect resp.http.frob-yes == "true"
+	expect resp.http.frob-no == "false"
+	expect resp.http.frob2-0 == "error0"
+	expect resp.http.frob2-1 == "error1"
+	expect resp.http.frob2-2 == "error2"
+	expect resp.http.azbc == "true"
+	expect resp.http.azbc-0 == "abc"
+	expect resp.http.azbc-1 == "a"
+	expect resp.http.azbc-2 == "error2"
+	expect resp.http.azbc-3 == "bc"
 } -run
 
 logexpect l1 -v v1 -d 1 -g vxid -q "VCL_Error" {
 	expect 0 * Begin req
 	expect * = VCL_Error "^vmod pcre2 error: barbaz.backref.0. called without prior match$"
+	expect * = VCL_Error "^vmod pcre2 error: in frobnitz.backref.0.: no match$"
+	expect * = VCL_Error "^vmod pcre2 error: in frobnitz.backref.1.: no match$"
+	expect * = VCL_Error "^vmod pcre2 error: in frobnitz.backref.2.: no match$"
+	expect * = VCL_Error "^vmod pcre2 error: in frobnitz.backref.0.: no match$"
+	expect * = VCL_Error "^vmod pcre2 error: in frobnitz.backref.1.: no match$"
+	expect * = VCL_Error "^vmod pcre2 error: in frobnitz.backref.2.: no match$"
+	expect * = VCL_Error "^vmod pcre2 error: in azbc.backref.2.: requested value is not set$"
 	expect * = End
 } -run