What kind of flash memory? What functions do you want to test? How thoroughly do you want to test them?
If you're talking about serial flash, either with SPI or I2C interfaces, there are articles on this website (check Nuts and Volts) about using them with a BS2. Even without the built-in I2C commands of the later model Stamps, you can do I2C. Once you have that working, you can write different bit patterns into a flash memory and read them back to check for correctness.
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If you're talking about serial flash, either with SPI or I2C interfaces, there are articles on this website (check Nuts and Volts) about using them with a BS2. Even without the built-in I2C commands of the later model Stamps, you can do I2C. Once you have that working, you can write different bit patterns into a flash memory and read them back to check for correctness.