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If you don't want to burn your own EPROMs, you can purchase ready-made diagnostic cartridges that plug directly into the expansion port: brendanalford/zx-diagnostics - GitHub zx spectrum test program link
This is the gold standard for Spectrum diagnostics. It is often what people mean when they ask for a "test program." Here’s a concise text you can use for
Chaining test programs allows multiple small tests to execute sequentially without reloading the entire cassette/disk image. Two common approaches: zx spectrum test program link