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You can only test for the output being at the proper voltage. Try using resistors to draw different currents to test for static load regulation. You can switch them in and out with a power MSOFET to test for transient regulation.
It is always good to precisely specify what IC/device do you have in mind, as different devices may behave in compltely different ways.
If you have unregulated-output dc/dc converters they will usually generate approximately 130% of nominal voltage without any load: for example small 5V dc/dc without load will have around 6.5V ..
Also, instead of changing linear loads (such as resistors) you can use for test non-linear load such as a light (bulb) rated for 60-80% on max load. This will test a dc/dc converter for inrush current as well as normal load ..
You can only test for the output being at the proper voltage. Try using resistors to draw different currents to test for static load regulation. You can switch them in and out with a power MSOFET to test for transient regulation.
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