Improve some comments.

test/output_test.h

@@ -78,18 +78,15 @@ void RunOutputTests(int argc, char* argv[]);
 struct Results;
 typedef std::function< void(Results const&) > ResultsCheckFn;
 
-// Add a function to check the (CSV) results of a benchmark. These
-// functions will be called only after the output was successfully
-// checked.
-// bm_name_pattern: a name or a regex which will be matched agains
-//                  all the benchmark names. Matching benchmarks
-//                  will be the subject of a call to fn
 size_t AddChecker(const char* bm_name_pattern, ResultsCheckFn fn);
 
-// Class to hold the (CSV!) results of a benchmark.
+// Class holding the results of a benchmark.
 // It is passed in calls to checker functions.
 struct Results {
-  std::string name; // the benchmark name
+
+  // the benchmark name
+  std::string name;
+  // the benchmark fields
   std::map< std::string, std::string > values;
 
   Results(const std::string& n) : name(n) {}

test/output_test_helper.cc

@@ -247,11 +247,11 @@ void ResultsChecker::SetHeader_(const std::string& csv_header) {
   field_names = SplitCsv_(csv_header);
 }
 
-// set the values for subscribed benchmarks, and silently ignore all others
+// set the values for a benchmark
 void ResultsChecker::SetValues_(const std::string& entry_csv_line) {
+  if(entry_csv_line.empty()) return; // some lines are empty
   CHECK(!field_names.empty());
   auto vals = SplitCsv_(entry_csv_line);
-  if(vals.empty()) return;
   CHECK_EQ(vals.size(), field_names.size());
   results.emplace_back(vals[0]); // vals[0] is the benchmark name
   auto &entry = results.back();