Make internal

Author: YegorStepanov

src/BenchmarkDotNet/Reports/Summary.cs

@@ -80,8 +80,8 @@ public Summary(
 
         public int GetNumberOfExecutedBenchmarks() => Reports.Count(report => report.ExecuteResults.Any(result => result.FoundExecutable));
 
-        public bool IsMultipleRuntimes
-            => isMultipleRuntimes ??= BenchmarksCases.Length > 1 ? BenchmarksCases.Select(benchmark => benchmark.GetRuntime()).Distinct().Count() > 1 : false;
+        internal bool IsMultipleRuntimes
+            => isMultipleRuntimes ??= BenchmarksCases.Length > 1 && BenchmarksCases.Select(benchmark => benchmark.GetRuntime()).Distinct().Count() > 1;
 
         internal static Summary NothingToRun(string title, string resultsDirectoryPath, string logFilePath)
             => new Summary(title, ImmutableArray<BenchmarkReport>.Empty, HostEnvironmentInfo.GetCurrent(), resultsDirectoryPath, logFilePath, TimeSpan.Zero, DefaultCultureInfo.Instance, ImmutableArray<ValidationError>.Empty, ImmutableArray<IColumnHidingRule>.Empty);