Add tests for compile option no_auto_capture

src/tests/backref_basic.vtc

@@ -64,6 +64,7 @@ varnish v1 -vcl {
 		new frobnitz = pcre2.regex("(frob)(nitz)");
 		new barbaz = pcre2.regex("(bar)(baz)");
 		new azbc = pcre2.regex("(a|(z))(bc)");
+		new foo = pcre2.regex("(f)(o)(o)", no_auto_capture=true);
 	}
 
 	sub vcl_recv {
@@ -107,6 +108,12 @@ varnish v1 -vcl {
 		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");
+
+		set resp.http.foo = foo.match("foo");
+		set resp.http.foo-0 = foo.backref(0, "error0");
+		set resp.http.foo-1 = foo.backref(1, "error1");
+		set resp.http.foo-2 = foo.backref(2, "error2");
+		set resp.http.foo-3 = foo.backref(3, "error3");
 	}
 }
 
@@ -132,6 +139,11 @@ client c1 -repeat 2 {
 	expect resp.http.azbc-1 == "a"
 	expect resp.http.azbc-2 == "error2"
 	expect resp.http.azbc-3 == "bc"
+	expect resp.http.foo == "true"
+	expect resp.http.foo-0 == "foo"
+	expect resp.http.foo-1 == "error1"
+	expect resp.http.foo-2 == "error2"
+	expect resp.http.foo-3 == "error3"
 } -run
 
 logexpect l1 -v v1 -d 1 -g vxid -q "VCL_Error" {
@@ -147,5 +159,8 @@ logexpect l1 -v v1 -d 1 -g vxid -q "VCL_Error" {
 	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$"
+	expect * = VCL_Error "^vmod pcre2 error: in foo.backref.1.: unknown substring$"
+	expect * = VCL_Error "^vmod pcre2 error: in foo.backref.2.: unknown substring$"
+	expect * = VCL_Error "^vmod pcre2 error: in foo.backref.3.: unknown substring$"
 	expect * = End
 } -run

src/tests/compile_opts.vtc

@@ -10,9 +10,10 @@ varnishtest "compile options"
 # Most of the examples in this test are adapted from pcre2 testdata.
 
 # extended option is tested in compile.vtc and match.vtc
+# no_auto_capture tested in backref_basic.vtc
 
 # XXX
-# - tests for no_auto_capture and ungreedy require backrefs
+# - tests for ungreedy require backrefs
 # - tests for alt_verbnames will require retrieving the mark
 # - auto_callout not implemented yet
 # - test for dupnames will require capturing named refs