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lorem{{#if:true|#foo|bar}}ipsum

gives

lorem
   1. fooipsum

Special:ExpandTemplates test expands it as:

lorem
#fooipsum

Same with "lorem{{#if:true|*foo|bar}}ipsum" and "lorem{{#if:true|:foo|bar}}ipsum".

So it's impossible to have this kind of results of test as inline text (expected result for first case would be lorem#fooipsum).

While it's impossible to remove the newline, it's easy to add it to have #*: behave as list items.