@Override
    public Status check() {
        if (applicationContext == null) {
            SpringExtensionInjector springExtensionInjector = SpringExtensionInjector.get(applicationModel);
            applicationContext = springExtensionInjector.getContext();
        }

        if (applicationContext == null) {
            return new Status(Status.Level.UNKNOWN);
        }

        Map<String, DataSource> dataSources = applicationContext.getBeansOfType(DataSource.class, false, false);
        if (CollectionUtils.isEmptyMap(dataSources)) {
            return new Status(Status.Level.UNKNOWN);
        }
        Status.Level level = Status.Level.OK;
        StringBuilder buf = new StringBuilder();
        for (Map.Entry<String, DataSource> entry : dataSources.entrySet()) {
            DataSource dataSource = entry.getValue();
            if (buf.length() > 0) {
                buf.append(", ");
            }
            buf.append(entry.getKey());

            try (Connection connection = dataSource.getConnection()) {
                DatabaseMetaData metaData = connection.getMetaData();
                try (ResultSet resultSet = metaData.getTypeInfo()) {
                    if (!resultSet.next()) {
                        level = Status.Level.ERROR;
                    }
                }
                buf.append(metaData.getURL());
                buf.append('(');
                buf.append(metaData.getDatabaseProductName());
                buf.append('-');
                buf.append(metaData.getDatabaseProductVersion());
                buf.append(')');
            } catch (Throwable e) {
                logger.warn(CONFIG_WARN_STATUS_CHECKER, "", "", e.getMessage(), e);
                return new Status(level, e.getMessage());
            }
        }
        return new Status(level, buf.toString());
    }
@Test
    void testWithDatasourceHasNextResult() throws SQLException {
        Map<String, DataSource> map = new HashMap<String, DataSource>();
        DataSource dataSource = mock(DataSource.class);
        Connection connection = mock(Connection.class, Answers.RETURNS_DEEP_STUBS);
        given(dataSource.getConnection()).willReturn(connection);
        given(connection.getMetaData().getTypeInfo().next()).willReturn(true);

        map.put("mockDatabase", dataSource);
        given(applicationContext.getBeansOfType(eq(DataSource.class), anyBoolean(), anyBoolean()))
                .willReturn(map);
        Status status = dataSourceStatusChecker.check();

        assertThat(status.getLevel(), is(Status.Level.OK));
    }