This is an interesting test.
The spaces have been replaced with soft-hypens in this one. A soft-hypen is a hint to where a line break may occur, but it's not normally a visible character, *except* if you break on it, at which point, it becomes visible. For example (where '-' represents a soft-hyphen):
This-is-a-sample-line
Presentation wise, you should display it as:
Thisisa- sampleline
UTF-8, everybody!
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bͮeͧnͧdͦuͮmͩpͫuͧrͥuͣs͢aͮr͢cͮuͦ.Aͩlͪiͥqͧuͬa͢mͬsͣoͦlͤl͡i͢cͤiͤtͨuͫdͩiͩnͤtͭuͩrͨp͢iͮsͩeͧg͠eͫtͤrͧi͡sͩuͬsͫs͠aͭgͭiͭtͨtͩi͡sͧrͧuͥtͣrͮuͮmͬ.Qͫuͭiͩsͫqͮuͬe͡v͢eͬlͩiͥt͠nͭeͨq͢uͫeͪ,tͥeͨmͧpͨo͢r͢sͤiͨtͬaͦmͣeͭt͢pͩuͬl͠vͤi͡nͨaͮrͫsͨeͯdͥ,tͮiͧnͥcͩiͫdͩu͢nͣtͯnͥe͠cͥeͭlͧiͫtͧ.Nͩuͥlͯlͫa͢mͣtͬrͤiͦsͬt͢iͯqͭuͯeͧcͨoͦn͡sͪeͩcͨt͢e͠t͠u͢r͡aͮnͤtͭeͥ,eͨgͨeͩtͦvͭa͡rͣiͬu͡s͠aͭrͣcͣu͢cͮoͭnͥsͥeͩcͩtͥe͠tͬuͨrͮe͡tͫ.Iͫnͣtͨeͦgͣeͤrͨnͯo͠n͡vͬe͢sͦtͥiͧbͦuͨlͦuͭmͪlͧiͤgͪuͧlͮaͦ