Edwin Chen developed end-to-end test coverage for chained matrix multiplication in the google/heir repository, focusing on validating encrypted and plaintext workflows using OpenFHE’s CKKS path. He implemented a test scenario where an encrypted matrix is multiplied by two plaintext matrices, leveraging 64x64 matrices with n=4096 to exercise both cryptographic and linear algebra code paths. The test configuration was generated with Rotom to ensure reproducibility and scalability. Using Python and MLIR, Edwin emphasized robust testing over bug fixing, strengthening regression safety for cryptographic routines and enabling more reliable performance and accuracy assessments for matrix operations in secure computation contexts.