}
		versions = append(versions, v)
	}
	return versions
}

func (c *Config) curvePreferences(version uint16) []CurveID {
	var curvePreferences []CurveID
	if c != nil && len(c.CurvePreferences) != 0 {
		curvePreferences = slices.Clone(c.CurvePreferences)
		if needFIPS() {
			return slices.DeleteFunc(curvePreferences, func(c CurveID) bool {
				return !slices.Contains(defaultCurvePreferencesFIPS, c)
			})
		}

		},
	}
	runServerTestTLS13(t, test)
}

// TestHandshakeServerKeySharePreference checks that we prefer a key share even
// if it's later in the CurvePreferences order.
func TestHandshakeServerKeySharePreference(t *testing.T) {
	config := testConfig.Clone()
	config.CurvePreferences = []CurveID{X25519, CurveP256}

	test := &serverTest{
		name:    "KeySharePreference",

		},
		{
			name: "ClientCurvePreferences",
			clientConfig: func(config *Config) {
				config.CurvePreferences = []CurveID{X25519}
			},
			expectClientSupport: false,
		},
		{
			name: "ServerCurvePreferencesX25519",
			serverConfig: func(config *Config) {
				config.CurvePreferences = []CurveID{X25519}
			},
			expectClientSupport: true,
			expectKyber:         false,

		cert: testECDSACertificate,
		key:  testECDSAPrivateKey,
	}
	runClientTestTLS12(t, test)
}

func TestHandshakeClientX25519(t *testing.T) {
	config := testConfig.Clone()
	config.CurvePreferences = []CurveID{X25519}

	test := &clientTest{
		name:   "X25519-ECDHE",
		args:   []string{"-cipher", "ECDHE-RSA-AES128-GCM-SHA256", "-curves", "X25519"},
		config: config,
	}