fix integration test

Author: valentinsulzer

tests/integration/test_models/standard_output_comparison.py

@@ -146,8 +146,8 @@ def __init__(self, time, solutions):
     def test_all(self):
         self.compare("Negative particle concentration [mol.m-3]")
         self.compare("Positive particle concentration [mol.m-3]")
-        self.compare("Negative particle flux [mol.m-2.s-1]", rtol=0.05)
-        self.compare("Positive particle flux [mol.m-2.s-1]", rtol=0.05)
+        self.compare("Negative particle flux [mol.m-2.s-1]", atol=1e-7, rtol=0.05)
+        self.compare("Positive particle flux [mol.m-2.s-1]", atol=1e-7, rtol=0.05)
 
 
 class PorosityComparison(BaseOutputComparison):