Linked genes outcomes in offspring
There is nothing wrong with the question and it can be explained with not much more than mendelian genetics + linkage.

What do you think are the genotypes of parents?

First hint: If there is more than one phenotype (for the trait) of the offspring at least one of parents must be heterozygote. So the idea of pure lineages goes out of the window here.

Ok, there is at least one heterozygote for each color and smoothness of seeds. What is the genotype of the other parent?

Hint 2: Test cross is a term for cross between recessive homozygote and individual of unknown genome (with dominant phenotype). The test cross reveals genotype of the parent with unknown genome.

Hint 3: 1:1 ratio of phenotypes is typical of cross between a heterozygote and recessive homozygote.

Ok so we have heterozygote and recessive homozygote for both traits. Which traits are dominant and which are recessive? 

Hint 4: This question seems to be inspired by original Mendel work. Feel free to read it here to find out which traits are recessive and which are dominant. It is quite a good read, clear in its presentation of evidence and conclusions and I recommend it to everyone.

However, this knowledge is not necessary to answer the question. How are dominant genes organized in parents? Principally we have two options:

(AaBb x aabb) or (Aabb x aaBb)

If we consider organization on chromosomes it expands to basically 3 options:

Option 1:

chr ---A---B---
chr ---a---b---
         X
chr ---a---b---
chr ---a---b---


Option 2:

chr ---A---b---
chr ---a---B---
         X
chr ---a---b---
chr ---a---b---


Option 3:

chr ---A---b---
chr ---a---b---
         X
chr ---a---B---
chr ---a---b---


I leave it to you to figure out which of the tree options leads to result offspring described in the question.