diff --git a/python/test/test_basic.py b/python/test/test_basic.py
index a890409daa..15bb620367 100755
--- a/python/test/test_basic.py
+++ b/python/test/test_basic.py
@@ -21,7 +21,7 @@ class TestBasic(unittest.TestCase):
     # IMPORTANT: This test must be run first since it calls MPI_Init()
     def test_01_blackoil(self):
         with pushd(self.data_dir_bo):
-            sim = create_black_oil_simulator(args=['--linear-solver=ilu0'], filename="SPE1CASE1.DATA")
+            sim = create_black_oil_simulator(args=['--linear-solver=ilu0', '--output-dir=01_basic'], filename="SPE1CASE1.DATA")
             sim.setup_mpi(init=True, finalize=False)
             sim.step_init()
             sim.step()
@@ -47,7 +47,7 @@ class TestBasic(unittest.TestCase):
 
     def test_02_onephase(self):
         with pushd(self.data_dir_op):
-            sim = create_onephase_simulator(args=['--linear-solver=ilu0'], filename="SPE1CASE1_WATER.DATA")
+            sim = create_onephase_simulator(args=['--linear-solver=ilu0', '--output-dir=02_basic'], filename="SPE1CASE1_WATER.DATA")
             sim.setup_mpi(init=False, finalize=False)
             sim.step_init()
             sim.step()
@@ -68,7 +68,7 @@ class TestBasic(unittest.TestCase):
     # IMPORTANT: This test must be run last since it calls MPI_Finalize()
     def test_99_gaswater(self):
         with pushd(self.data_dir_gw):
-            sim = create_gas_water_simulator(args=['--linear-solver=ilu0'], filename="SPE1CASE2_GASWATER.DATA")
+            sim = create_gas_water_simulator(args=['--linear-solver=ilu0', '--output-dir=99_basic'], filename="SPE1CASE2_GASWATER.DATA")
             sim.setup_mpi(init=False, finalize=True)
             sim.step_init()
             sim.step()
diff --git a/python/test/test_fluidstate_variables.py b/python/test/test_fluidstate_variables.py
index 98f28c9375..9971b58c57 100644
--- a/python/test/test_fluidstate_variables.py
+++ b/python/test/test_fluidstate_variables.py
@@ -21,7 +21,7 @@ class TestBasic(unittest.TestCase):
     # IMPORTANT:This test must be run first since it calls MPI_Init()
     def test_01_blackoil(self):
         with pushd(self.data_dir_bo):
-            sim = create_black_oil_simulator(filename="SPE1CASE1.DATA")
+            sim = create_black_oil_simulator(args=['--output-dir=01_fluidstate'], filename="SPE1CASE1.DATA")
             sim.setup_mpi(True, False)
             sim.step_init()
             sim.step()
@@ -52,7 +52,7 @@ class TestBasic(unittest.TestCase):
 
     def test_02_onephase(self):
         with pushd(self.data_dir_op):
-            sim = create_onephase_simulator("SPE1CASE1_WATER.DATA")
+            sim = create_onephase_simulator(args=["--output-dir=02_fluidstate"], filename="SPE1CASE1_WATER.DATA")
             sim.setup_mpi(False, False)
             sim.step_init()
             sim.step()
@@ -66,7 +66,7 @@ class TestBasic(unittest.TestCase):
     # IMPORTANT: This test must be run last since it calls MPI_Finalize()
     def test_99_gaswater(self):
         with pushd(self.data_dir_gw):
-            sim = create_gas_water_simulator(filename="SPE1CASE2_GASWATER.DATA")
+            sim = create_gas_water_simulator(args=["--output-dir=99_fluidstate"], filename="SPE1CASE2_GASWATER.DATA")
             sim.setup_mpi(False, True)
             sim.step_init()
             sim.step()
diff --git a/python/test/test_primary_variables.py b/python/test/test_primary_variables.py
index b8f9b747e1..1f4a149da2 100644
--- a/python/test/test_primary_variables.py
+++ b/python/test/test_primary_variables.py
@@ -24,7 +24,7 @@ class TestBasic(unittest.TestCase):
     # IMPORTANT:This test must be run first since it calls MPI_Init()
     def test_01_blackoil(self):
         with pushd(self.data_dir_bo):
-            sim = create_black_oil_simulator(filename="SPE1CASE1.DATA")
+            sim = create_black_oil_simulator(args=["--output-dir=01_primary"], filename="SPE1CASE1.DATA")
             sim.setup_mpi(True, False)
             sim.step_init()
             sim.step()
@@ -53,7 +53,7 @@ class TestBasic(unittest.TestCase):
 
     def test_02_onephase(self):
         with pushd(self.data_dir_op):
-            sim = create_onephase_simulator("SPE1CASE1_WATER.DATA")
+            sim = create_onephase_simulator(args=["--output-dir=02_primary"], filename="SPE1CASE1_WATER.DATA")
             sim.setup_mpi(False, False)
             sim.step_init()
             sim.step()
@@ -78,7 +78,7 @@ class TestBasic(unittest.TestCase):
     # IMPORTANT: This test must be run last since it calls MPI_Finalize()
     def test_99_gaswater(self):
         with pushd(self.data_dir_gw):
-            sim = create_gas_water_simulator(filename="SPE1CASE2_GASWATER.DATA")
+            sim = create_gas_water_simulator(args=["--output-dir=99_primary"], filename="SPE1CASE2_GASWATER.DATA")
             sim.setup_mpi(False, True)
             sim.step_init()
             sim.step()