Tested thrown exceptions values

djmoney_rates/backends.py

@@ -28,7 +28,7 @@ def get_source_name(self):
         Return the name that identifies the ratings source
         """
         if not self.source_name:
-            raise RateBackendError("'source_name' can't be empty or"
+            raise RateBackendError("'source_name' can't be empty or "
                                    "you should override 'get_source_name'")
 
         return self.source_name
@@ -38,7 +38,7 @@ def get_base_currency(self):
         Return the base currency to which the rates are referred
         """
         if not self.base_currency:
-            raise RateBackendError("'base_currency' can't be empty or"
+            raise RateBackendError("'base_currency' can't be empty or "
                                    "you should override 'get_base_currency'")
 
         return self.base_currency

tests/test_backends.py

@@ -31,9 +31,17 @@ def set_up():
     money_rates_settings.OPENEXCHANGE_APP_ID = "fake-app-id"
 
 def test_source_name_empty_is_invalid():
-    with pytest.raises(RateBackendError):
+    with pytest.raises(RateBackendError) as exc:
         BaseRateBackend().get_source_name()
 
+    assert "'source_name' can't be empty or you should override 'get_source_name'" in str(exc.value)
+
+def test_base_currency_empty_is_invalid():
+    with pytest.raises(RateBackendError) as exc:
+        BaseRateBackend().get_base_currency()
+
+    assert "'base_currency' can't be empty or you should override 'get_base_currency'" in str(exc.value)
+
 @pytest.mark.django_db(transaction=True)
 def test_update_rates():
     class RateBackend(BaseRateBackend):
@@ -51,15 +59,19 @@ def get_rates(self):
 def test_missing_url_error(set_up):
     money_rates_settings.OPENEXCHANGE_URL = ""
 
-    with pytest.raises(ImproperlyConfigured):
+    with pytest.raises(ImproperlyConfigured) as exc:
         OpenExchangeBackend()
 
+    assert "OPENEXCHANGE_URL setting should not be empty when using OpenExchangeBackend" in str(exc.value)
+
 def test_missing_app_id(set_up):
     money_rates_settings.OPENEXCHANGE_APP_ID = ""
 
-    with pytest.raises(ImproperlyConfigured):
+    with pytest.raises(ImproperlyConfigured) as exc:
         OpenExchangeBackend()
 
+    assert "OPENEXCHANGE_APP_ID setting should not be empty when using OpenExchangeBackend" in str(exc.value)
+
 def test_url_is_correct(set_up):
     backend = OpenExchangeBackend()
     assert backend.url == "http://openexchangerates.org/api/latest.json?app_id=fake-app-id&base=USD"

tests/test_commands.py

@@ -18,9 +18,11 @@ def get_rates(self):
 
 
 def test_fail_when_custom_backend_do_not_exists():
-    with pytest.raises(CommandError):
+    with pytest.raises(CommandError) as exc:
         call_command("update_rates", "fake.custom.Backend")
 
+    assert "Cannot find custom backend fake.custom.Backend. Is it correct" in str(exc.value)
+
 @pytest.mark.django_db(transaction=True)
 def test_custom_backend_used_when_specified():
     call_command("update_rates", "tests.test_commands.CustomBackend")