When it doesn't break, it should conditionally omit the trailing space

It should omit the trailing space if it is stripped anyway
{% if %}{% else %}space {%- endif %}
{% if %}X{% else %}space {%- endif %}

It should not omit the trailing space if there's space before the named branch
(else)
{% if %}{% else %}space {% endif %}
{%- if %}{% else %}space {% endif -%}
{% if %}{% else %}space {% endif %}

It should not omit the outer whitespace in elsif else chain
{% if a %}{% elsif b %}{% else %}{% endif %}
{% if a %}{% elsif b %} {% else %}{% endif %}
{% if a %}{% elsif b %}X {% else %}{% endif %}
{% if a %}{% elsif b %} X {% else %}{% endif %}
{% if a %}{% elsif b %}  X  {% else %}{% endif %}

It should not omit the whitespace because of whitespace stripping outside the tag
<p>
{% if %}{% else %}aaaaaaaaaaaaaaaaaaaaaaaaaaaa {% endif %}{{ value }}
</p>

It should not omit the whitespace if it is included inline in a paragraph
<p>haha{% if %}{% else %}space {% endif %}haha</p>