diff --git a/tests/integreren/afstandTest.py b/tests/integreren/afstandTest.py
index fbafe17..e33c8a1 100644
--- a/tests/integreren/afstandTest.py
+++ b/tests/integreren/afstandTest.py
@@ -12,6 +12,7 @@ def before():
 		matplotlib.use("Agg")
 		import matplotlib.pyplot as plt
 		plt.switch_backend("Agg")
+		lib.neutralizeFunction(matplotlib.use)
 		lib.neutralizeFunction(plt.pause)
 	except ImportError:
 		pass
diff --git a/tests/integreren/histogramTest.py b/tests/integreren/histogramTest.py
index dc523a6..bec66e0 100644
--- a/tests/integreren/histogramTest.py
+++ b/tests/integreren/histogramTest.py
@@ -13,7 +13,9 @@ def before():
 		matplotlib.use("Agg")
 		import matplotlib.pyplot as plt
 		plt.switch_backend("Agg")
+		lib.neutralizeFunction(matplotlib.use)
 		lib.neutralizeFunction(plt.pause)
+		lib.neutralizeFunction(plt.plot)
 	except ImportError:
 		pass
 
diff --git a/tests/integreren/montecarloTest.py b/tests/integreren/montecarloTest.py
index 161fa76..56160c8 100644
--- a/tests/integreren/montecarloTest.py
+++ b/tests/integreren/montecarloTest.py
@@ -13,8 +13,9 @@ def before():
 		matplotlib.use("Agg")
 		import matplotlib.pyplot as plt
 		plt.switch_backend("Agg")
-		lib.neutralizeFunction(plt.pause)
 		lib.neutralizeFunction(matplotlib.use)
+		lib.neutralizeFunction(plt.pause)
+		lib.neutralizeFunction(plt.plot)
 	except ImportError:
 		pass
 
diff --git a/tests/integreren/nulpuntenTest.py b/tests/integreren/nulpuntenTest.py
index f3acf98..2016947 100644
--- a/tests/integreren/nulpuntenTest.py
+++ b/tests/integreren/nulpuntenTest.py
@@ -12,7 +12,9 @@ def before():
 		matplotlib.use("Agg")
 		import matplotlib.pyplot as plt
 		plt.switch_backend("Agg")
+		lib.neutralizeFunction(matplotlib.use)
 		lib.neutralizeFunction(plt.pause)
+		lib.neutralizeFunction(plt.plot)
 	except ImportError:
 		pass
 
diff --git a/tests/integreren/plotTest.py b/tests/integreren/plotTest.py
index 7d217dd..d15f642 100644
--- a/tests/integreren/plotTest.py
+++ b/tests/integreren/plotTest.py
@@ -20,6 +20,7 @@ def before():
 		matplotlib.use("Agg")
 		import matplotlib.pyplot as plt
 		plt.switch_backend("Agg")
+		lib.neutralizeFunction(matplotlib.use)
 		lib.neutralizeFunction(plt.pause)
 	except ImportError:
 		pass
diff --git a/tests/integreren/randomwiskundeTest.py b/tests/integreren/randomwiskundeTest.py
index 89678e4..755861d 100644
--- a/tests/integreren/randomwiskundeTest.py
+++ b/tests/integreren/randomwiskundeTest.py
@@ -8,7 +8,3 @@ def correctAmount(test):
 	test.test = lambda : assertlib.numberOnLine(math.e, lib.getLine(lib.outputOf(_fileName), 0), deviation = 0.0027)
 	test.description = lambda : "Geeft de correcte gemiddeld aantal worpen"
 	test.succes = lambda info : "komt dit getal bekend voor?"
-
-
-	
-
diff --git a/tests/integreren/riemannTest.py b/tests/integreren/riemannTest.py
index 03938a3..f0fdc0e 100644
--- a/tests/integreren/riemannTest.py
+++ b/tests/integreren/riemannTest.py
@@ -13,7 +13,9 @@ def before():
 		matplotlib.use("Agg")
 		import matplotlib.pyplot as plt
 		plt.switch_backend("Agg")
+		lib.neutralizeFunction(matplotlib.use)
 		lib.neutralizeFunction(plt.pause)
+		lib.neutralizeFunction(plt.plot)
 	except ImportError:
 		pass
 
diff --git a/tests/integreren/twitterTest.py b/tests/integreren/twitterTest.py
index 27d1be0..194dc40 100644
--- a/tests/integreren/twitterTest.py
+++ b/tests/integreren/twitterTest.py
@@ -13,7 +13,9 @@ def before():
 		matplotlib.use("Agg")
 		import matplotlib.pyplot as plt
 		plt.switch_backend("Agg")
+		lib.neutralizeFunction(matplotlib.use)
 		lib.neutralizeFunction(plt.pause)
+		lib.neutralizeFunction(plt.plot)
 	except ImportError:
 		pass
 
@@ -60,6 +62,13 @@ def correctFunc1(test):
 
 	# ^---- Filter global code from source file -----
 
-	test.test = lambda : assertlib.between(lib.getFunction("twitter", _fileName)(), 0.82, 0.83)
+	def testMethod():
+		import time
+		s = time.time()
+		res = assertlib.between(lib.getFunction("twitter", _fileName)(), 0.82, 0.83)
+		print(time.time() - s)
+		return res
+
+	test.test = testMethod
 	test.description = lambda : "twitter geeft het juiste antwoord"
 	test.timeout = lambda : 90