add function interface to assertItem

[calvernaz]

Hi all,

This PR is a small add-on on top of the existing methods to make assertions easier.

With this we are allowed to transform and assert as we please instead of the full item and the equals equivalency of the item.

Example

class Person {
    int age;
    String name;
}

UniAssertSubscriber<Person> subscriber = uni
    .subscribe().withSubscriber(UniAssertSubscriber.create());
subscriber.assertSubscribed().assertItem(p -> p.name, person.name);

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (eb76731) 89.37% compared to head (c2570ce) 89.32%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1469      +/-   ##
============================================
- Coverage     89.37%   89.32%   -0.05%     
  Complexity     3365     3365              
============================================
  Files           459      459              
  Lines         13399    13402       +3     
  Branches       1640     1640              
============================================
- Hits          11975    11971       -4     
- Misses          797      801       +4     
- Partials        627      630       +3     

Files	Coverage Δ
...llrye/mutiny/helpers/test/UniAssertSubscriber.java	91.97% <0.00%> (-2.06%)	⬇️

... and 9 files with indirect coverage changes

[XiangZhouWD]

Looks good to me.

[jponge]

Note: @XiangZhouWD is not affiliated to this project.

[jponge]

I'm not really sure this adds much to our testing support, and at the very least this is only specific to Uni. Do you have more complex use-cases that would justify this addition?

[calvernaz]

I'm not really sure this adds much to our testing support, and at the very least this is only specific to Uni. Do you have more complex use-cases that would justify this addition?

This allows for transformation, and individual properties assertion.

[jponge]

🎄

Let's revisit in January.

[rasmushaglund]

I'm thinking about this kind of functionality but for Multi. Maybe something like this:

multi.subscribe().withSubscriber(AssertSubscriber.create())
    .request(1)
    .assertLastItem(p -> {
       assertEquals("name", p.name);
       assertEquals(38, p.age);
    })
    .request(1)
    .assertLastItem(p -> {
       assertEquals("another name", p.name);
    });

Maybe there could also be a assertItems which takes multiple function parameters.