A method, comprising: suspending, by a formation-tester tool positioned downhole in an openhole wellbore, proppant in a fracturing fluid located in a chamber of the formation-tester tool; generating, by the formation-tester tool, a test fracture in an uncased wall of an area of interest of a subterranean formation adjacent to the openhole wellbore; injecting, by the formation-tester tool, the fracturing fluid and the proppant toward the uncased wall and into the test fracture; and retrieving, by the formation-tester tool, a fluid sample from a reservoir within the area of interest of the subterranean formation by creating a drawdown pressure in the test fracture; wherein (a) the formation-tester tool is positioned downhole in the openhole wellbore on a wireline, and suspending the proppant in the fracturing fluid located in the chamber of the formation-tester tool includes, prior to generating the test fracture, agitating the fracturing fluid by the chamber of the formation-tester tool moving, for at least one interval, in an uphole direction and in an opposing direction in succession; or (b) suspending the proppant in the fracturing fluid located in the chamber of the formation-tester tool includes, prior to generating the test fracture, transmitting, by an acoustic resonance section of the formation-tester tool, an acoustic wave to cause the chamber of the formation-tester tool to vibrate and the fracturing fluid to move. suspending, by a formation-tester tool positioned downhole in an openhole wellbore, proppant in a fracturing fluid located in a chamber of the formation-tester tool; generating, by the formation-tester tool, a test fracture in an uncased wall of an area of interest of a subterranean formation adjacent to the openhole wellbore; injecting, by the formation-tester tool, the fracturing fluid and the proppant toward the uncased wall and into the test fracture; and retrieving, by the formation-tester tool, a fluid sample from a reservoir within the area of interest of the subterranean formation by creating a drawdown pressure in the test fracture; wherein (a) the formation-tester tool is positioned downhole in the openhole wellbore on a wireline, and suspending the proppant in the fracturing fluid located in the chamber of the formation-tester tool includes, prior to generating the test fracture, agitating the fracturing fluid by the chamber of the formation-tester tool moving, for at least one interval, in an uphole direction and in an opposing direction in succession; or (b) suspending the proppant in the fracturing fluid located in the chamber of the formation-tester tool includes, prior to generating the test fracture, transmitting, by an acoustic resonance section of the formation-tester tool, an acoustic wave to cause the chamber of the formation-tester tool to vibrate and the fracturing fluid to move. (a) the formation-tester tool is positioned downhole in the openhole wellbore on a wireline, and suspending the proppant in the fracturing fluid located in the chamber of the formation-tester tool includes, prior to generating the test fracture, agitating the fracturing fluid by the chamber of the formation-tester tool moving, for at least one interval, in an uphole direction and in an opposing direction in succession; or (b) suspending the proppant in the fracturing fluid located in the chamber of the formation-tester tool includes, prior to generating the test fracture, transmitting, by an acoustic resonance section of the formation-tester tool, an acoustic wave to cause the chamber of the formation-tester tool to vibrate and the fracturing fluid to move.