Have any predictions of general relativity other than the swarzchild solution ever been tested experimentally?

the swarzchild solution models a spherically symmetric space-time curvature in a vacuum, with the stress tensor describing the surrounding mass and energy distributions set to zero. but what happens when you have matter and energy distributions outside the spherical mass so the stress tensor no longer vanishes?... show more the swarzchild solution models a spherically symmetric space-time curvature in a vacuum, with the stress tensor describing the surrounding mass and energy distributions set to zero. but what happens when you have matter and energy distributions outside the spherical mass so the stress tensor no longer vanishes? how do we know the stress tensors are correct and correctly describe how space-time curves? einstein had to guess at what to put on the right side of his field equations, but was his guess correct? what if you only have electromagnetic energy and no mass distributions? has it ever been tested experimentally?
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