Résumé
The photon propagator is built in the "usual" LC-gauges within the distributional approach with test functions for the gauge fields. It is shown that test functions provide a sound definition, as distributions, of singular terms in (1/n.k)p where n2=0. The relevance of these extensions is exemplified in a test case where an infinite re-summation in powers of 1/n.k leads to known exact results. The effect of residual gauge degrees of freedom on the presence of singular terms in the most general LC-propagator is discussed in the Dirac-Bergmann algorithm.