Fix lint related to assigned but unused variables (#274)

Resolves F841.

Also improves several tests to assert on relevant behaviours.

Signed-off-by: Martin Packman <[email protected]>

Author: bz2

tests/test_core.py

@@ -53,7 +53,7 @@ def f(r):
         try:
             f(True)
         except ValueError:
-            raised = True
+            pass
         self.assertEqual(1, self.registry.get_sample_value('c'))
 
     def test_block_decorator(self):
@@ -315,7 +315,7 @@ def test_invalid_names_raise(self):
         self.assertRaises(ValueError, Summary, 'c', '', labelnames=['quantile'])
 
     def test_empty_labels_list(self):
-        h = Histogram('h', 'help', [], registry=self.registry)
+        Histogram('h', 'help', [], registry=self.registry)
         self.assertEqual(0, self.registry.get_sample_value('h_sum'))
 
     def test_wrapped_original_class(self):

tests/test_exposition.py

@@ -13,7 +13,6 @@
 from prometheus_client import CollectorRegistry, generate_latest
 from prometheus_client import push_to_gateway, pushadd_to_gateway, delete_from_gateway
 from prometheus_client import CONTENT_TYPE_LATEST, instance_ip_grouping_key
-from prometheus_client import core
 from prometheus_client.exposition import default_handler, basic_auth_handler, MetricsHandler
 
 try:
@@ -207,7 +206,8 @@ def test_instance_ip_grouping_key(self):
         self.assertTrue('' != instance_ip_grouping_key()['instance'])
 
     def test_metrics_handler(self):
-        MyHandler = MetricsHandler.factory(core.REGISTRY)
+        handler = MetricsHandler.factory(self.registry)
+        self.assertEqual(handler.registry, self.registry)
 
 
 if __name__ == '__main__':

tests/test_parser.py

@@ -47,6 +47,8 @@ def test_simple_summary(self):
 a_count 1
 a_sum 2
 """)
+        summary = SummaryMetricFamily("a", "help", count_value=1, sum_value=2)
+        self.assertEqual([summary], list(families))
 
     def test_summary_quantiles(self):
         families = text_string_to_metric_families("""# TYPE a summary

tox.ini

@@ -64,7 +64,6 @@ ignore =
     E501,
     E722,
     E741,
-    F841,
     W293,
 import-order-style = google
 application-import-names = prometheus_client