Allow adding story keys to values with existing tir labels

telemetry/telemetry/internal/results/page_test_results_unittest.py

Index: telemetry/telemetry/internal/results/page_test_results_unittest.py
diff --git a/telemetry/telemetry/internal/results/page_test_results_unittest.py b/telemetry/telemetry/internal/results/page_test_results_unittest.py
index c929815fe5edb01d85ae59b6edd6b8cff6526aa9..efad8dba4b1f8c8d259d1a1d7f64a42a1a20aa05 100644
--- a/telemetry/telemetry/internal/results/page_test_results_unittest.py
+++ b/telemetry/telemetry/internal/results/page_test_results_unittest.py
@@ -107,6 +107,25 @@ class PageTestResultsTest(base_test_results_unittest.BaseTestResultsUnittest):
     self.assertEquals(v.grouping_keys['answer'], '42')
     self.assertEquals(v.tir_label, '42_bar')
 
+  def testAddValueWithStoryGroupingKeysAndExistingTirLabel(self):
+    results = page_test_results.PageTestResults()
+    self.pages[0].grouping_keys['foo'] = 'bar'
+    self.pages[0].grouping_keys['answer'] = '42'
+    results.WillRunPage(self.pages[0])
+    results.AddValue(scalar.ScalarValue(
+        self.pages[0], 'a', 'seconds', 3,
+        improvement_direction=improvement_direction.UP,
+        tir_label='existing_label'))
+    results.DidRunPage(self.pages[0])
+
+    results.PrintSummary()
+
+    values = results.FindPageSpecificValuesForPage(self.pages[0], 'a')
+    v = values[0]
+    self.assertEquals(v.grouping_keys['foo'], 'bar')
+    self.assertEquals(v.grouping_keys['answer'], '42')
+    self.assertEquals(v.tir_label, 'existing_label')
+
   def testAddValueWithDuplicateStoryGroupingKeyFails(self):
     results = page_test_results.PageTestResults()
     self.pages[0].grouping_keys['foo'] = 'bar'