  We know that each effect algebra $E$ is isomorphic to $\pi(X)$ for some
$E$-test spaces $(X,{\cal T})$.We describe when $\pi(x)\lor \pi(y)$ and
$\pi(x)\land\pi(y)$ exists for $x,y\in{\cal E}(X,{\cal T})$. Moreover we give
the formula for $\pi(x)\lor\pi(x)$ and $\pi(x)\land\pi(y)$ using only $x,y$ and
tests which are elements of ${\cal T}$. We obtain an example of finite, not
homogeneous effect algebra $E$ such that sharp elements of $E$ form a lattice,
whereas $E$ is not a lattice.
