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Little rectangles with a shiny solder blob on two ends are surface mount components.
They are either resistors (black body) or capacitors (tan, brown, blond bodies).
Capacitors are always between different power supplies and for our purposes are boring.
Resistors are often used as "build out", "pull up" or "pull down" and are usually very important.
So, yeah, the positive (red) lead to the resistor, the negative (black) lead to a good ground.
Technically speaking using the meter (in diode test) as a source of confusion is not as impressive as a lower value resistor.
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