It is an older paper, but aftet a skim the only significant missing experiment is LIGO. At the scales which GR is fundamentally concerned we simply do not have sufficient data or technology to test.
If we had tested everything that could be for GR or it had no contraditions we wouldn’t be creating modified theories of gravity or proposing new constants to try solve things, or trying to come up with some quantum theory of gravity.
Here’s a paper about testing einstein’s theory:
https://arxiv.org/pdf/0806.1731
It is an older paper, but aftet a skim the only significant missing experiment is LIGO. At the scales which GR is fundamentally concerned we simply do not have sufficient data or technology to test.
If we had tested everything that could be for GR or it had no contraditions we wouldn’t be creating modified theories of gravity or proposing new constants to try solve things, or trying to come up with some quantum theory of gravity.