enrich testing for cidr helpers

[Issacwww]

Issue number:

Closes #

Description of changes:
Running into issues when using is_ipv4 helper, try to add test and get it fixed

Testing done:

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[Issacwww]

This tests looks good

[Issacwww]

Getting below error, need advise for correct way to import them

error[E0308]: mismatched types
   --> api/schnauzer/tests/v2_render_templates.rs:200:29
    |
200 |             ("if_not_null", schnauzer::helpers::IfNotNullHelper),
    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected fn pointer, found `IfNotNullHelper`
    |
    = note: expected fn pointer `for<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, 'i, 'j> fn(&'a Helper<'b, 'c>, &'d Handlebars<'e>, &'f handlebars::Context, &'g mut RenderContext<'h, 'i>, &'j mut (dyn handlebars::Output + 'j)) -> Result<(), handlebars::RenderError>`
                   found struct `IfNotNullHelper`

error[E0308]: mismatched types
   --> api/schnauzer/tests/v2_render_templates.rs:201:25
    |
201 |             ("is_ipv4", schnauzer::helpers::is_ipv4),
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected fn pointer, found `is_ipv4`
    |
    = note: expected fn pointer `for<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, 'i, 'j> fn(&'a Helper<'b, 'c>, &'d Handlebars<'e>, &'f handlebars::Context, &'g mut RenderContext<'h, 'i>, &'j mut (dyn handlebars::Output + 'j)) -> Result<(), handlebars::RenderError>`
                   found struct `is_ipv4`