Which of the given is not a test cross? 

A cross which is made between an organism showing dominant phenotype (genotype is unknown) to a homozygous recessive organism is called test cross. Let us assume that pod shape in pea is controlled by gene I in pea plant. Dominant allele is I and recessive allele is i. Pure inflated pod of dominant trait has genotype II. Hybrid inflated pod has genotype Ii. Hence the cross between them is not test cross.