[Telemetry] AddIsEventInInteractions helper method

tools/telemetry/telemetry/web_perf/metrics/timeline_based_metric_unittest.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import unittest
 
 import telemetry.web_perf.metrics.timeline_based_metric as tbm_module
 
 
+class FakeEvent(object):
+  def __init__(self, start, end):
+    self.start = start
+    self.end = end
+
+
+class FakeRecord(object):
+  def __init__(self, start, end):
+    self.start = start
+    self.end = end
+
+
 class TimelineBasedMetricTest(unittest.TestCase):
 
   # pylint: disable=W0212
   def testTimeRangesHasOverlap(self):
     # Test cases with overlap on one side
     self.assertTrue(tbm_module._TimeRangesHasOverlap([(10, 20), (5, 15)]))
     self.assertTrue(tbm_module._TimeRangesHasOverlap([(5, 15), (10, 20)]))
     self.assertTrue(tbm_module._TimeRangesHasOverlap(
         [(5, 15), (25, 30), (10, 20)]))
 
     # Test cases with one range fall in the middle of other
     self.assertTrue(tbm_module._TimeRangesHasOverlap([(10, 20), (15, 18)]))
     self.assertTrue(tbm_module._TimeRangesHasOverlap([(15, 18), (10, 20)]))
     self.assertTrue(tbm_module._TimeRangesHasOverlap(
         [(15, 18), (40, 50), (10, 20)]))
 
     self.assertFalse(tbm_module._TimeRangesHasOverlap([(15, 18), (20, 25)]))
     self.assertFalse(tbm_module._TimeRangesHasOverlap(
         [(1, 2), (2, 3), (0, 1)]))
+
+  def testIsEventInInteractions(self):
+    self.assertFalse(
+        tbm_module.IsEventInInteractions(
+        FakeEvent(0, 100),
+        [FakeRecord(5, 105), FakeRecord(50, 200), FakeRecord(300, 400)]))
+    self.assertFalse(
+        tbm_module.IsEventInInteractions(
+        FakeEvent(50, 100),
+        [FakeRecord(105, 205), FakeRecord(0, 45), FakeRecord(0, 90)]))
+    self.assertTrue(
+        tbm_module.IsEventInInteractions(
+        FakeEvent(50, 100),
+        [FakeRecord(5, 105), FakeRecord(0, 45), FakeRecord(0, 90)]))
+    self.assertTrue(
+        tbm_module.IsEventInInteractions(
+        FakeEvent(50, 100),
+        [FakeRecord(5, 45), FakeRecord(0, 45), FakeRecord(0, 100)]))