net/http: add case for TestParseSetCookie

Updates #66008

Change-Id: Idd36a7f0b4128adfd0a3d7fe76eb6c2cea4306a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/579795
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Damien Neil <dneil@google.com>
diff --git a/src/net/http/cookie_test.go b/src/net/http/cookie_test.go
index 5337c33..ce5093c 100644
--- a/src/net/http/cookie_test.go
+++ b/src/net/http/cookie_test.go
@@ -826,6 +826,12 @@
 			line:   `special-8=","`,
 			cookie: &Cookie{Name: "special-8", Value: ",", Raw: `special-8=","`},
 		},
+		// Make sure we can properly read back the Set-Cookie headers
+		// for names containing spaces:
+		{
+			line:   `special-9 =","`,
+			cookie: &Cookie{Name: "special-9", Value: ",", Raw: `special-9 =","`},
+		},
 		{
 			line: "",
 			err:  errBlankCookie,