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The test was passing without real I2C communication due to a GPIO mismatch (slave on GPIO 6/7 vs RTC I2C master on GPIO 2/3), single-byte zero-coincidence, unchecked ULP return values, and an insufficient RTC I2C timeout. Fix slave GPIOs, increase test length, check I2C return values, add proper assertions, and set an adequate RTC I2C timeout. Co-authored-by: Cursor <cursoragent@cursor.com>