Added ref cache length check

Author: seanlaw

tests/test_cache.py

@@ -1,3 +1,4 @@
+import numba
 import numpy as np
 
 from stumpy import cache, stump
@@ -9,23 +10,25 @@ def test_cache_get_njit_funcs():
 
 
 def test_cache_save_after_clear():
-    cache.save()
-
     T = np.random.rand(10)
     m = 3
-    stump(T, m)
 
+    cache.save()
+    stump(T, m)
     ref_cache = cache._get_cache()
 
+    if numba.config.DISABLE_JIT:
+        assert len(ref_cache) == 0
+    else:
+        assert len(ref_cache) > 0
+
     cache.clear()
-    # testing cache._clear()
     assert len(cache._get_cache()) == 0
 
     cache.save()
     stump(T, m)
     comp_cache = cache._get_cache()
 
-    # testing cache._save() after cache._clear()
     assert sorted(ref_cache) == sorted(comp_cache)
 
     cache.clear()