public static String getProtocolVersion(final String databaseName, final DatabaseType databaseType) {
        return null == databaseName ? getDefaultProtocolVersion(databaseType) : SERVER_INFORMATION_MAP.getOrDefault(databaseName, getDefaultProtocolVersion(databaseType));
    }
@Test
    void assertGetServerVersionWithoutDatabase() {
        CommonConstants.PROXY_VERSION.set("5.0.0");
        assertThat(DatabaseProtocolServerInfo.getProtocolVersion(null, TypedSPILoader.getService(DatabaseType.class, "FIXTURE")), is("1.0-ShardingSphere-Proxy 5.0.0"));
    }