Expose macros from base/metrics/histogram_macros.h as functions

base/test/histogram_tester.h

 // 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.
 
 #ifndef BASE_TEST_HISTOGRAM_TESTER_H_
 #define BASE_TEST_HISTOGRAM_TESTER_H_
 
 #include <map>
 #include <memory>
 #include <ostream>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_base.h"
+#include "base/time/time.h"
 
 namespace base {
 
 struct Bucket;
 class HistogramSamples;
 
 // HistogramTester provides a simple interface for examining histograms, UMA
 // or otherwise. Tests can use this interface to verify that histogram data is
 // getting logged as intended.
 class HistogramTester {
@@ skipping 18 matching lines @@
   void ExpectBucketCount(const std::string& name,
                          base::HistogramBase::Sample sample,
                          base::HistogramBase::Count expected_count) const;
 
   // We don't know the values of the samples, but we know how many there are.
   // This measures the diff from the snapshot taken when this object was
   // constructed.
   void ExpectTotalCount(const std::string& name,
                         base::HistogramBase::Count count) const;
 
+  // We know exact number of samples for buckets corresponding to a
+  // time interval. Other intervals may have samples too.
+  void ExpectTimeBucketCount(const std::string& name,
+                             const base::TimeDelta& sample,

[Alexei Svitkine (slow), 2016/11/12 00:51:14]

Nit: I think base::TimeDelta should be passed by value. See its header.

[nikunjb, 2016/11/12 01:35:15]

Done. Also fixed the TimeDelta used in histogram_functions

+                             base::HistogramBase::Count count) const;
+
   // Returns a list of all of the buckets recorded since creation of this
   // object, as vector<Bucket>, where the Bucket represents the min boundary of
   // the bucket and the count of samples recorded to that bucket since creation.
   //
   // Example usage, using gMock:
   //   EXPECT_THAT(histogram_tester.GetAllSamples("HistogramName"),
   //               ElementsAre(Bucket(1, 5), Bucket(2, 10), Bucket(3, 5)));
   //
   // If you build the expected list programmatically, you can use ContainerEq:
   //   EXPECT_THAT(histogram_tester.GetAllSamples("HistogramName"),
@@ skipping 61 matching lines @@
 
   base::HistogramBase::Sample min;
   base::HistogramBase::Count count;
 };
 
 void PrintTo(const Bucket& value, std::ostream* os);
 
 }  // namespace base
 
 #endif  // BASE_TEST_HISTOGRAM_TESTER_H_