contextshuffling opened a new issue #3163: Test can fail if HashMap iterates in a different order URL: https://github.com/apache/incubator-shardingsphere/issues/3163 ## Bug Report **For English only**, other languages will not accept. Before report a bug, make sure you have: - Searched open and closed [GitHub issues](https://github.com/apache/incubator-shardingsphere/issues). - Read documentation: [ShardingSphere Doc](https://shardingsphere.apache.org/document/current/en/overview). Please pay attention on issues you submitted, because we maybe need more details. If no response **more than 7 days** and we cannot reproduce it on current information, we will **close it**. Please answer these questions before submitting your issue. Thanks! ### Which version of ShardingSphere did you use? dev branch: 4.0.0-RC3-SNAPSHOT ### Which project did you use? Sharding-JDBC or Sharding-Proxy? sharding-jdbc ### Expected behavior Test cases inside `EncryptPreparedStatementTest` and `EncryptStatementTest.java ` should pass regardless of the HashMap iteration orders. ### Actual behavior Tests can fail if the order changes ### Reason analyze (If you can) Currently, test cases inside `EncryptPreparedStatementTest` and `EncryptStatementTest.java ` are using `dataSourceMap`, a HashMap, defined in `AbstractSQLTest`. The testing helper function `assertResultSet` has a line like following ``` try (Connection conn = getDatabaseTypeMap().values().iterator().next().values().iterator().next().getConnection(); ...) ``` It is basically getting the first item in the map so it depends on the iterative order of HashMap. However, HashMap does not guarantee any specific order of entries. Therefore, the assertions in those test cases will fail if the order is different. ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc. Slightly modifies the order of `DB_NAMES` in `AbstractSQLTest` will cause the test to fail. ### Example codes for reproduce this issue (such as a github link). ``` private static final List<String> DB_NAMES = Arrays.asList( "jdbc_0","encrypt", "jdbc_1"); ```
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