Add StreamReaderReadLineTests and base TextReaderReadLineTests (#2170)

* Add StreamReaderReadLineTests and base TextReaderReadLineTests

* change to create memorystream on each invocation instead

Author: nietras

src/benchmarks/micro/libraries/System.IO/StreamReaderReadLineTests.cs

@@ -0,0 +1,39 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text;
+using System.Threading.Tasks;
+using BenchmarkDotNet.Attributes;
+using MicroBenchmarks;
+
+namespace System.IO.Tests
+{
+    [BenchmarkCategory(Categories.Libraries)]
+    public class StreamReaderReadLineTests : TextReaderReadLineTests
+    {
+        private byte[] _bytes;
+
+        [GlobalSetup]
+        public void GlobalSetup()
+        {
+            _text = GenerateLinesText(LineLengthRange, 16 * 1024);
+            _bytes = Encoding.UTF8.GetBytes(_text);
+        }
+
+        [Benchmark]
+        public void ReadLine()
+        {
+            using StreamReader reader = new (new MemoryStream(_bytes));
+            while (reader.ReadLine() != null) ;
+        }
+
+        [Benchmark]
+        [BenchmarkCategory(Categories.NoWASM)]
+        public async Task ReadLineAsync()
+        {
+            using StreamReader reader = new(new MemoryStream(_bytes));
+            while (await reader.ReadLineAsync() != null) ;
+        }
+    }
+}

src/benchmarks/micro/libraries/System.IO/StringReaderReadLineTests.cs

@@ -12,32 +12,8 @@
 namespace System.IO.Tests
 {
     [BenchmarkCategory(Categories.Libraries)]
-    public class StringReaderReadLineTests
+    public class StringReaderReadLineTests : TextReaderReadLineTests
     {
-        private string _text;
-
-        [ParamsSource(nameof(GetLineLengthRanges))]
-        public Range LineLengthRange { get; set; }
-
-        public static IEnumerable<Range> GetLineLengthRanges()
-        {
-            yield return new() { Min = 0, Max = 0 };
-            yield return new() { Min = 1, Max = 1 };
-            yield return new() { Min = 1, Max = 8 };
-            yield return new() { Min = 9, Max = 32 };
-            yield return new() { Min = 33, Max = 128 };
-            yield return new() { Min = 129, Max = 1024 };
-            yield return new() { Min = 0, Max = 1024 };
-        }
-
-        public class Range
-        {
-            public int Min { get; set; }
-            public int Max { get; set; }
-
-            public override string ToString() => $"[{Min,4}, {Max,4}]";
-        }
-
         [GlobalSetup]
         public void GlobalSetup() => _text = GenerateLinesText(LineLengthRange, 16 * 1024);
 
@@ -55,36 +31,5 @@ public async Task ReadLineAsync()
             using StringReader reader = new(_text);
             while (await reader.ReadLineAsync() != null) ;
         }
-
-        private static string GenerateLinesText(Range lineLengthRange, int textTargetLength)
-        {
-            var min = lineLengthRange.Min;
-            var max = lineLengthRange.Max;
-
-            var newLine = Environment.NewLine;
-
-            var capacity = textTargetLength + max + newLine.Length;
-            var sb = new StringBuilder(capacity);
-
-            var random = new Random(42);
-            int lineCount = 0;
-            while(sb.Length < textTargetLength)
-            {
-                var charsCount = random.Next(min, max);
-                for (int c = 0; c < charsCount; c++)
-                {
-                    var ch = (char)random.Next('0', 'z');
-                    sb.Append(ch);
-                }
-                sb.Append(newLine);
-                ++lineCount;
-            }
-            var text = sb.ToString();
-
-            Console.WriteLine($"// Generated lines {lineCount} and " +
-                $"text length {text.Length} out of capacity {capacity}");
-
-            return text;
-        }
     }
 }

src/benchmarks/micro/libraries/System.IO/TextReaderReadLineTests.cs

@@ -0,0 +1,71 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Generic;
+using System.Text;
+using BenchmarkDotNet.Attributes;
+using MicroBenchmarks;
+
+namespace System.IO.Tests
+{
+    [BenchmarkCategory(Categories.Libraries)]
+    public abstract class TextReaderReadLineTests
+    {
+        protected string _text;
+
+        [ParamsSource(nameof(GetLineLengthRanges))]
+        public Range LineLengthRange { get; set; }
+
+        public static IEnumerable<Range> GetLineLengthRanges()
+        {
+            yield return new() { Min = 0, Max = 0 };
+            yield return new() { Min = 1, Max = 1 };
+            yield return new() { Min = 1, Max = 8 };
+            yield return new() { Min = 9, Max = 32 };
+            yield return new() { Min = 33, Max = 128 };
+            yield return new() { Min = 129, Max = 1024 };
+            yield return new() { Min = 1025, Max = 2048 };
+            yield return new() { Min = 0, Max = 1024 };
+        }
+
+        public class Range
+        {
+            public int Min { get; set; }
+            public int Max { get; set; }
+
+            public override string ToString() => $"[{Min,4}, {Max,4}]";
+        }
+
+        protected static string GenerateLinesText(Range lineLengthRange, int textTargetLength)
+        {
+            var min = lineLengthRange.Min;
+            var max = lineLengthRange.Max;
+
+            var newLine = Environment.NewLine;
+
+            var capacity = textTargetLength + max + newLine.Length;
+            var sb = new StringBuilder(capacity);
+
+            var random = new Random(42);
+            int lineCount = 0;
+            while (sb.Length < textTargetLength)
+            {
+                var charsCount = random.Next(min, max);
+                for (int c = 0; c < charsCount; c++)
+                {
+                    var ch = (char)random.Next('0', 'z');
+                    sb.Append(ch);
+                }
+                sb.Append(newLine);
+                ++lineCount;
+            }
+            var text = sb.ToString();
+
+            Console.WriteLine($"// Generated lines {lineCount} and " +
+                $"text length {text.Length} out of capacity {capacity}");
+
+            return text;
+        }
+    }
+}