diff --git a/kaska/interp_fix.py b/kaska/interp_fix.py
index f6a3477..44b3cd5 100644
--- a/kaska/interp_fix.py
+++ b/kaska/interp_fix.py
@@ -28,57 +28,3 @@ def interp1d(newx, oldx, oldy):
             newy[i] = np.interp(newx, oldx[mask], y[mask])
     newy_T = newy.transpose(1,0).reshape((new_shape,) + oldy_shape)
     return newy_T
-
-def test1d():
-    newx = np.arange(200)
-    oldx = np.array(sorted(np.random.choice(np.arange(200), 100, replace=False)))
-    oldy = oldy = np.random.rand(100)
-    np_ret    = np.interp(newx, oldx, oldy)
-    numba_ret = interp1d(newx, oldx, oldy)
-    if not np.allclose(np_ret, numba_ret):
-        raise
-    print('Same result achieved')
-
-def test2d():
-    newx = np.arange(200)
-    oldx = np.array(sorted(np.random.choice(np.arange(200), 100, replace=False)))
-    oldy = oldy = np.random.rand(100,5)
-    numba_ret = interp1d(newx, oldx, oldy)
-    for i in range(5):
-        np_ret    = np.interp(newx, oldx, oldy[:,i])
-        if not np.allclose(np_ret, numba_ret[:,i]):
-            raise
-    print('Same result achieved')
-
-def test3d():
-    newx = np.arange(200)
-    oldx = np.array(sorted(np.random.choice(np.arange(200), 100, replace=False)))
-    oldy = oldy = np.random.rand(100, 5, 10)
-    numba_ret = interp1d(newx, oldx, oldy)
-    for i in range(5):
-        for j in range(10):
-            np_ret    = np.interp(newx, oldx, oldy[:,i, j])
-            if not np.allclose(np_ret, numba_ret[:,i, j]):
-                raise
-    print('Same result achieved')
-
-def testgap():
-    newx = np.arange(200)
-    oldx = np.array(sorted(np.random.choice(np.arange(200), 100, replace=False)))
-    oldy = oldy = np.random.rand(100, 5, 10)
-    for i in range(5):
-        for j in range(10):
-            bad_pix = np.random.choice(range(100), 100)
-            gap_oldy = oldy[:,i, j].copy()
-            gap_oldy[bad_pix] = np.nan
-            numba_ret = interp1d(newx, oldx, gap_oldy)
-            np_ret = np.interp(newx, oldx, gap_oldy)
-            diff    = numba_ret - np_ret
-            if not np.nansum(diff)<1e-10:
-                raise
-    print('Same result achieved and filled gaps')
-if __name__ == '__main__':
-    test1d()
-    test2d() 
-    test3d()
-    testgap()
\ No newline at end of file
diff --git a/kaska/tests/test_interp.py b/kaska/tests/test_interp.py
new file mode 100644
index 0000000..5872e43
--- /dev/null
+++ b/kaska/tests/test_interp.py
@@ -0,0 +1,54 @@
+'''
+Test the interp functionality
+
+'''
+
+import pytest
+import numpy as np
+
+import sys
+
+from .. import interp_fix
+
+def test1d():
+    newx = np.arange(200)
+    oldx = np.array(sorted(np.random.choice(np.arange(200), 100, replace=False)))
+    oldy = oldy = np.random.rand(100)
+    np_ret    = np.interp(newx, oldx, oldy)
+    numba_ret = interp_fix.interp1d(newx, oldx, oldy)
+    assert np.allclose(np_ret, numba_ret)
+
+def test2d():
+    newx = np.arange(200)
+    oldx = np.array(sorted(np.random.choice(np.arange(200), 100, replace=False)))
+    oldy = oldy = np.random.rand(100,5)
+    numba_ret = interp_fix.interp1d(newx, oldx, oldy)
+    for i in range(5):
+        np_ret    = np.interp(newx, oldx, oldy[:,i])
+        assert np.allclose(np_ret, numba_ret[:,i])
+
+def test3d():
+    newx = np.arange(200)
+    oldx = np.array(sorted(np.random.choice(np.arange(200), 100, replace=False)))
+    oldy = oldy = np.random.rand(100, 5, 10)
+    numba_ret = interp_fix.interp1d(newx, oldx, oldy)
+    for i in range(5):
+        for j in range(10):
+            np_ret    = np.interp(newx, oldx, oldy[:,i, j])
+            assert np.allclose(np_ret, numba_ret[:,i, j])
+
+# def testgap():
+#     newx = np.arange(200)
+#     oldx = np.array(sorted(np.random.choice(np.arange(200), 100, replace=False)))
+#     oldy = oldy = np.random.rand(100, 5, 10)
+#     for i in range(5):
+#         for j in range(10):
+#             bad_pix = np.random.choice(range(100), 100)
+#             gap_oldy = oldy[:,i, j].copy()
+#             gap_oldy[bad_pix] = np.nan
+#             numba_ret = interp_fix.interp1d(newx, oldx, gap_oldy)
+#             np_ret = np.interp(newx, oldx, gap_oldy)
+#             diff    = numba_ret - np_ret
+#             if not np.nansum(diff)<1e-10:
+#                 raise
+#     print('Same result achieved and filled gaps')
\ No newline at end of file