[CALCITE-6957] The RelOptRulesTest tests should fail if the xml file …

[NobiGo]

…contains tests that do not exist in Java

[mihaibudiu]

What's the relation between this and #4312?

[NobiGo]

What's the relation between this and #4312?

This PR can be directly replaced with #4312.

After this PR, we can solve the only existing XML methods by copying and pasting the file_actual.xml and don't need to delete them one by one.
In addition, the exception information will be clearer. For example, in PR's unit test DiffRepositoryTest#testMethodOnlyExistsInXml:
The exception will be:

java.lang.IllegalArgumentException: Actual and reference files differ. If you are adding new tests, replace the reference file with the current actual file, after checking its content.
diff /calcite/testkit/build/diffrepo/test/org/apache/calcite/test/DiffRepositoryTest_actual.xml /calcite/testkit/src/test/resources/org/apache/calcite/test/DiffRepositoryTest.xml
26d25
<   <TestCase name="testMethodOnlyExistsInXml1"/>

[xiedeyantu]

This implementation is fantastic! If developers add tests in Java and XML formats, there will be no need to focus on case consistency issues. I will close my PR #4312 and switch to supporting this.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
97.8% Coverage on New Code
0.0% Duplication on New Code

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