diff --git a/tests/test_LoaderChain.py b/tests/test_LoaderChain.py
index 13279341e65e01eb6e04e68e11dcfc0b1e28377c..5f3fa218afa032b32fbde8be94722f3fd320a478 100644
--- a/tests/test_LoaderChain.py
+++ b/tests/test_LoaderChain.py
@@ -11,8 +11,9 @@ SUCCESS_S = '"success"\n'
 ERROR = oxrlib.errors.LoaderNoDataError("test")
 
 class FakeLoader:
-    def __init__(self, result):
+    def __init__(self, result, *, is_cache=False):
         self.result = result
+        self._is_cache = is_cache
 
     def _respond(self, *args, **kwargs):
         return io.StringIO(self.result)
@@ -20,13 +21,13 @@ class FakeLoader:
     def __getattr__(self, name):
         return self._respond
 
+    def is_cache(self):
+        return self._is_cache
 
-class FakeErrorLoader(FakeLoader):
-    def __init__(self, error):
-        self.error = error
 
+class FakeErrorLoader(FakeLoader):
     def _respond(self, *args, **kwargs):
-        raise self.error
+        raise self.result
 
 
 @pytest.fixture
@@ -70,3 +71,21 @@ def test_no_success(lchain, any_date, error_loader, count):
         assert error is ERROR
     else:
         assert False, "{} not raised".format(type(ERROR).__name__)
+
+def test_should_cache(lchain, any_date, good_loader):
+    cache_loader = FakeErrorLoader(ERROR, is_cache=True)
+    lchain.add_loader(cache_loader)
+    lchain.add_loader(good_loader)
+    lchain.historical(any_date, 'USD')
+    assert lchain.should_cache()
+
+def test_should_cache_unable(lchain, any_date, good_loader):
+    lchain.add_loader(good_loader)
+    lchain.historical(any_date, 'USD')
+    assert not lchain.should_cache(), "suggested using unavailable cache"
+
+def test_should_cache_unneeded(lchain, any_date):
+    loader = FakeLoader(SUCCESS_S, is_cache=True)
+    lchain.add_loader(loader)
+    lchain.historical(any_date, 'USD')
+    assert not lchain.should_cache(), "suggested rewriting cache"