Request contexts are now illegal during the handshake.

One less thing to keep track of.
https://github.com/tlswg/tls13-spec/pull/549 got merged.

Change-Id: Ide66e547140f8122a3b8013281be5215c11b6de0
Reviewed-on: https://boringssl-review.googlesource.com/10482
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Steven Valdez <svaldez@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/ssl/test/runner/runner.go b/ssl/test/runner/runner.go
index 71278ae..f999f48 100644
--- a/ssl/test/runner/runner.go
+++ b/ssl/test/runner/runner.go
@@ -3125,7 +3125,7 @@
 				MaxVersion: VersionTLS13,
 				MinVersion: VersionTLS13,
 			},
-			resumeSession:        true,
+			resumeSession: true,
 		})
 
 		tests = append(tests, testCase{
@@ -3135,7 +3135,7 @@
 				MaxVersion: VersionTLS13,
 				MinVersion: VersionTLS13,
 			},
-			resumeSession:        true,
+			resumeSession: true,
 		})
 
 		tests = append(tests, testCase{
@@ -8007,6 +8007,24 @@
 		shouldFail:    true,
 		expectedError: ":WRONG_CURVE:",
 	})
+
+	testCases = append(testCases, testCase{
+		name: "TLS13-RequestContextInHandshake",
+		config: Config{
+			MaxVersion: VersionTLS13,
+			MinVersion: VersionTLS13,
+			ClientAuth: RequireAnyClientCert,
+			Bugs: ProtocolBugs{
+				SendRequestContext: []byte("request context"),
+			},
+		},
+		flags: []string{
+			"-cert-file", path.Join(*resourceDir, rsaCertificateFile),
+			"-key-file", path.Join(*resourceDir, rsaKeyFile),
+		},
+		shouldFail:    true,
+		expectedError: ":DECODE_ERROR:",
+	})
 }
 
 func worker(statusChan chan statusMsg, c chan *testCase, shimPath string, wg *sync.WaitGroup) {