During the inspection in the master bath, we noticed moderate water damage to the interior of the vanity under the sink. When we tested the single handle faucet, the cold water did not turn on at the sink. After a closer look, we determined the cold water valve under the sink was shut off. We turned the water on, and immediately noticed a pinhole leak in the cold water supply line. Being a single handle faucet, it would have been very easy to just turn the faucet on. Without actually testing to verify you have both hot & cold water, and making sure the hot water gets hot, & cold water stays cold, this may not have been discovered. Again, a great example of why a home inspection is necessary.