Add test for ColumnInterface

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[what-the-diff]

PR Summary

• Modification of Test File
  The QueryBuilderTest.php is updated. This is a part of our testing suite that assures the quality and reliability of our code.

• New Test Case Addition
  A new test case has been added for the alterColumn method. This method changes the characteristics of a column in our database.

• Testing the SQL Statement Output
  This new test case ensures that when we modify a column and add a new unique constraint, the right SQL (Structured Query Language) statement is produced. SQL is the language we use to manage and manipulate our database.

• Validation of Rules
  Specifically, this test checks that the column type becomes varchar(30) and a unique constraint on the 'bar' column gets added. These changes help implement a rule that every entry in the 'bar' column must be unique and of a certain length. This ensures the consistency and integrity of our data.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.16% 🎉

Comparison is base (e5de2fc) 99.83% compared to head (ed6a37b) 100.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master      #304      +/-   ##
=============================================
+ Coverage     99.83%   100.00%   +0.16%     
  Complexity      201       201              
=============================================
  Files            13        13              
  Lines           599       599              
=============================================
+ Hits            598       599       +1     
+ Misses            1         0       -1     

see 1 file with indirect coverage changes

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[vjik]

@Tigrov Thanks 👍