slinkydeveloper opened a new pull request #17932:
URL: https://github.com/apache/flink/pull/17932


   ## What is the purpose of the change
   
   Added some basic utilities for testing table apis, like:
   
   * `assertThat(DataType)`
   * `assertThat(LogicalType)`
   * `assertThat(RowData)`
   
   Also add `FlinkAssertions` in `flink-test-utils-junit` to add some 
assertions and utilities to use together with assertj. Also deprecate the old 
matchers for hamcrest.
   
   ## Brief change log
   
   * Add `TableAssertions` to encapsulate all the assertion constructors for 
our custom assertions
   * Add `FlinkAssertions`
   * Refactored some tests from junit assertions and hamcrest to assertj
   
   ## Verifying this change
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? not applicable
   


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