テストコードが増えるとバグは減るのだろうか？ / Does more test code mean fewer bugs?

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© ZOZO Technologies, Inc. 30 w ࢓༷࿙Ε͕ݟ͔ͭΔ౓ʹ֬ೝΛ͢Δ͜ͱͰ։ൃ଎౓ɾޮ཰͕௿Լ͢Δ w ։ൃऴ൫ʹ࢓༷ͷߟྀ࿙Ε͕ൃ͕֮ͨ͜͠Ε͔Βͷमਖ਼͕ࠔ೉ w ࢓༷Λे෼ʹཧղ͠ͳ͍··։ൃ͕׬ྃɹɹɹɹɹɹɹɹɹɹɹɹɹ ˠϦϦʔεޙʹෆ۩߹͕ൃ֮ ςετίʔυͷ࣮૷ʹΑΓ࢓༷ͷཧղ͕ਂ·Δ ςετέʔεΛࣄલʹߟ֤͑έʔεͰςετίʔυΛ࣮૷͢Δ͜ͱ ͸࢓༷ͷཧղʹͭͳ͕Δ

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