Allow rounding errors in Site Engagement tests

chrome/browser/engagement/site_engagement_score_unittest.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/engagement/site_engagement_score.h"
 
 #include <utility>
 
 #include "base/macros.h"
 #include "base/test/simple_test_clock.h"
 #include "base/values.h"
 #include "chrome/browser/engagement/site_engagement_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 const int kLessAccumulationsThanNeededToMaxDailyEngagement = 2;
 const int kMoreAccumulationsThanNeededToMaxDailyEngagement = 40;
 const int kMoreAccumulationsThanNeededToMaxTotalEngagement = 200;
 const int kLessDaysThanNeededToMaxTotalEngagement = 4;
 const int kMoreDaysThanNeededToMaxTotalEngagement = 40;
 const int kLessPeriodsThanNeededToDecayMaxScore = 2;
 const int kMorePeriodsThanNeededToDecayMaxScore = 40;
+const double kMaxRoundingDeviation = 0.0001;
 
 base::Time GetReferenceTime() {
   base::Time::Exploded exploded_reference_time;
   exploded_reference_time.year = 2015;
   exploded_reference_time.month = 1;
   exploded_reference_time.day_of_month = 30;
   exploded_reference_time.day_of_week = 5;
   exploded_reference_time.hour = 11;
   exploded_reference_time.minute = 0;
   exploded_reference_time.second = 0;
@@ skipping 402 matching lines @@
   current_day += base::TimeDelta::FromDays(21);
   test_clock_.SetNow(current_day);
   EXPECT_DOUBLE_EQ(2.0, score_.GetScore());
 
   // Ensure point removal happens after proportional decay.
   score_.AddPoints(4.0);
   EXPECT_DOUBLE_EQ(6.0, score_.GetScore());
   SetParamValue(SiteEngagementScore::DECAY_POINTS, 2.0);
   current_day += base::TimeDelta::FromDays(7);
   test_clock_.SetNow(current_day);
-  EXPECT_DOUBLE_EQ(1.0, score_.GetScore());
+  EXPECT_NEAR(1.0, score_.GetScore(), kMaxRoundingDeviation);
 }