Add rst to mass test

test/trop_de_tests.rst

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+Faire tous les cas de figures
+=============================
+
+Tester toutes les multiplications possibles
+-------------------------------------------
+
+ .. code-block:: python
+
+  >>> from itertools import permutations
+  >>> coefs_p = [[(i-2),(j-2)] for i,j in permutations(range(5),2)] 
+  >>> coefs_q = [[2*(i-2),2*(j-2)] for i,j in permutations(range(5),2)] 
+  >>> l_p = [Polynom(i) for i in coefs_p]
+  >>> l_q = [Polynom(i) for i in coefs_q]
+  >>> operations = [Expression([l_p[i],l_q[j],op.mul]) for i,j in permutations(range(len(coefs_p)),2)]
+  >>> for i in operations:
+  ...   print(i)