Add tests in associations_many2many_test.go and associations_test.go

[saumil-oracle]

Description

Add basic association tests for BelongsTo, HasMany, and ManyToMany.
Tests are run using the below conditions:

=== GORM Environment Information ===
Run at : Wed, 03 Sep 2025 20:35:59 +0530
Go version : go1.24.4 (darwin/arm64)
Oracle Database version : Oracle Database 26ai Enterprise Edition Release 26.0.0.0.0 - Development
Version 26.1.0.24.00
Client Driver : godror : v0.49.0+ODPI-5.6.0
Oracle Client library version : 23.3.0.23.09

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[shelly-li-sl]

This test seems a dup of TestMany2ManyAssociation. Could you double check?

[saumil-oracle]

they are similar, but both the tests have diff purposes:
TestMany2ManyAssociation: it has tests of all many-to-many operations (Find, Append, Replace, Delete, Clear) with basic validation.
TestMany2ManyAssociationCountValidation: I am focusing on validating the accuracy of the Count() method and ensuring it matches the actual Find() results after various operations.

[shelly-li-sl]

thanks for the details!