The Android Testing Pyramid That Strict MVI Unlocks

80% of your presentation tests live in the reducer tier and run in 5ms. The other four tiers exist, but they are narrow on purpose — device-bound work is the rarest thing the pyramid measures. Strict MVI is what makes that shape possible in the first place. Five tiers at a glance The shape is fixed: a wide reducer base, a thinner middleware band, a narrow store-integration strip, a screen layer, and a handful of macrobenchmarks on top. A mid-sized feature produces 30–50 reducer tests, 10–20 midd