  We test the 3d-3d correspondence for theories that are labelled by Lens
spaces. We find a full agreement between the index of the 3d ${\cal N}=2$ "Lens
space theory" $T[L(p,1)]$ and the partition function of complex Chern-Simons
theory on $L(p,1)$. In particular, for $p=1$, we show how the familiar $S^3$
partition function of Chern-Simons theory arises from the index of a free
theory. For large $p$, we find that the index of $T[L(p,1)]$ becomes a constant
independent of $p$. In addition, we study $T[L(p,1)]$ on the squashed
three-sphere $S^3_b$. This enables us to see clearly, at the level of partition
function, to what extent $G_\mathbb{C}$ complex Chern-Simons theory can be
thought of as two copies of Chern-Simons theory with compact gauge group $G$.
