Made some tests more robust

wrappers/python/tests/TestMetadynamics.py

@@ -17,7 +17,7 @@ class TestMetadynamics(unittest.TestCase):
         cv = CustomBondForce('r')
         cv.addBond(0, 1)
         bias = BiasVariable(cv, 0.94, 1.06, 0.02)
-        meta = Metadynamics(system, [bias], 300*kelvin, 2.0, 5.0, 10)
+        meta = Metadynamics(system, [bias], 300*kelvin, 3.0, 5.0, 10)
         integrator = LangevinIntegrator(300*kelvin, 10/picosecond, 0.001*picosecond)
         topology = Topology()
         chain = topology.addChain()

wrappers/python/tests/TestSimulatedTempering.py

@@ -35,7 +35,7 @@ class TestSimulatedTempering(unittest.TestCase):
         
         distances = [[] for i in range(10)]
         count = 0
-        for i in range(7000):
+        for i in range(20000):
             st.step(5)
             pos = simulation.context.getState(getPositions=True).getPositions().value_in_unit(nanometers)
             r = norm(pos[0]-pos[1])