add tests for the one_line option

src/tests/options.vtc

 # looks like -*- vcl -*-
 
-varnishtest "literal, never_nl, dot_nl and case_sensitive options"
+varnishtest "literal, never_nl, dot_nl, case_sensitive and one_line options"
 
 # Tests from re2 testing/parse_test.cc and testing/re2_test.cc
 varnish v1 -vcl {
@@ -19,6 +19,8 @@ varnish v1 -vcl {
 	       new dot2 = re2.regex("(?-s).", dot_nl=true);
 	       new dot3 = re2.regex(".", dot_nl=true, never_nl=true);
 	       new case = re2.regex("(?i)([wand]{5})", case_sensitive=true);
+	       new not_one = re2.regex("^a$", posix_syntax=true);
+	       new one = re2.regex("^a$", posix_syntax=true, one_line=true);
 	}
 
 	sub vcl_recv {
@@ -73,6 +75,16 @@ def
 			set resp.http.case = "match";
 			set resp.http.case1 = case.backref(1);
 		}
+		if (not_one.match({"a
+a
+a"}                             )) {
+			set resp.http.not_one = "match";
+		}
+		if (one.match({"a
+a
+a"}                             )) {
+			set resp.http.one = "match";
+		}
 	}
 
 } -start
@@ -93,4 +105,6 @@ client c1 {
 	expect resp.http.dot3 == <undef>
 	expect resp.http.case == "match"
 	expect resp.http.case1 == "Wanda"
+	expect resp.http.not_one == "match"
+	expect resp.http.one == <undef>
 } -run