const expected = [ 1, 2, 3, 0, 4, 5, 6, 0, 7, 8, 9, 0, 0, 0, 0, 1, ]; testMat4WithAndWithoutDest((newDst) => { const m3 = mat3.create(1, 2, 3, 4, 5, 6, 7, 8, 9); return mat4.fromMat3(m3, newDst); }, expected);