Test partials directly without a template

[rperryng]

Hello,

I'd like to be able to test the logic of a partial / named template directly.

This was previously open under #21 but later closed without a resolution.

Currently, I believe partials can only be tested through a template that references them, so one possible workaround would be to write a template file that only references the partial, like:

# charts/my-chart/templates/tests-for-partials/my-partial.yaml

name: {{ include "my-chart.my-partial" (dict "hello" "world") }}

The problem with this is that:

• these template files which only exist to facilitate a test cannot be added to .helmignore, since helm-unittest also won't see the template
• therefore the template will be included in the helm package artifact, and therefore will always be rendered (unless some logic is included to not render them by default, though this also feels undesirable as it adds unnecessary render time)

[rperryng]

I suppose this is functionally a dupe of #171 as well, with the only difference being somewhat semantic: my chart isn't always meant to be a "library" - it has templates that render my partials but for simplicity's sake it would be nice to test complex partials directly