Fix test_import.py

Closes #57

tests/test_import.py

@@ -1,31 +1,11 @@
-# Author: Chunyang Wang
-# GitHub Username: acse-cw1722
-
-from pytest import fixture
-
-
-@fixture(scope="module")
-def UM2N():
+def test_import_um2n():
     import UM2N
+    assert UM2N
 
-    return UM2N
-
-
-@fixture(scope="module")
-def firedrake():
+def test_import_firedrake():
     import firedrake
+    assert firedrake
 
-    return firedrake
-
-
-@fixture(scope="module")
-def movement():
+def test_import_movement():
     import movement
-
-    return movement
-
-
-def test_import(UM2N, firedrake, movement):
-    assert UM2N
-    assert firedrake
     assert movement