if test.expectHRR {
				if !ss.testingOnlyDidHRR {
					t.Error("server did not use HRR")
				}
				if !cs.testingOnlyDidHRR {
					t.Error("client did not use HRR")
				}
			} else {
				if ss.testingOnlyDidHRR {
					t.Error("server used HRR")
				}
				if cs.testingOnlyDidHRR {
					t.Error("client used HRR")
				}
			}
		})
	}
}

			}
		case extensionCookie:
			if !readUint16LengthPrefixed(&extData, &m.cookie) ||
				len(m.cookie) == 0 {
				return false
			}
		case extensionKeyShare:
			// This extension has different formats in SH and HRR, accept either
			// and let the handshake logic decide. See RFC 8446, Section 4.2.8.
			if len(extData) == 2 {
				if !extData.ReadUint16((*uint16)(&m.selectedGroup)) {
					return false
				}
			} else {