StreamExtensions mit UnitTests versehen

2021-12-19 22:21:05 +01:00
parent 37650db1e1
commit e5b9959d8e
3 changed files with 172 additions and 15 deletions
--- a/AMWD.Common.Tests/Extensions/StreamExtensionsTests.cs
+++ b/AMWD.Common.Tests/Extensions/StreamExtensionsTests.cs
@@ -0,0 +1,138 @@
+using System;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AMWD.Common.Tests.Extensions
+{
+	[TestClass]
+	public class StreamExtensionsTests
+	{
+		[TestMethod]
+		public void ShouldReadLineFromStreamSynchronous()
+		{
+			// arrange
+			var sb = new StringBuilder();
+			sb.AppendLine("First Line");
+			sb.AppendLine("Second Line");
+			byte[] buffer = Encoding.UTF8.GetBytes(sb.ToString().Trim());
+			var stream = new MemoryStream(buffer);
+
+			// act
+			string line = stream.ReadLine();
+
+			// assert
+			Assert.AreEqual("First Line", line);
+
+			stream.Dispose();
+		}
+
+		[TestMethod]
+		public void ShouldReadUntilEndAsLineSynchronous()
+		{
+			// arrange
+			byte[] buffer = Encoding.UTF8.GetBytes("Single Line");
+			var stream = new MemoryStream(buffer);
+
+			// act
+			string line = stream.ReadLine();
+
+			// assert
+			Assert.AreEqual("Single Line", line);
+
+			stream.Dispose();
+		}
+
+		[TestMethod]
+		public void ShouldReturnNullWhenNotReadableSynchronous()
+		{
+			// arrange
+			var stream = new WriteOnlyStream();
+
+			// act
+			string line = stream.ReadLine();
+
+			// assert
+			Assert.IsNull(line);
+
+			stream.Dispose();
+		}
+
+		[TestMethod]
+		public async Task ShouldReadLineFromStreamAsynchronous()
+		{
+			// arrange
+			var sb = new StringBuilder();
+			sb.AppendLine("First Line");
+			sb.AppendLine("Second Line");
+			byte[] buffer = Encoding.UTF8.GetBytes(sb.ToString().Trim());
+			var stream = new MemoryStream(buffer);
+
+			// act
+			string line = await stream.ReadLineAsync();
+
+			// assert
+			Assert.AreEqual("First Line", line);
+
+			stream.Dispose();
+		}
+
+		[TestMethod]
+		public async Task ShouldReadUntilEndAsLineAsynchronous()
+		{
+			// arrange
+			byte[] buffer = Encoding.UTF8.GetBytes("Single Line");
+			var stream = new MemoryStream(buffer);
+
+			// act
+			string line = await stream.ReadLineAsync();
+
+			// assert
+			Assert.AreEqual("Single Line", line);
+
+			stream.Dispose();
+		}
+
+		[TestMethod]
+		public async Task ShouldReturnNullWhenNotReadableAsynchronous()
+		{
+			// arrange
+			var stream = new WriteOnlyStream();
+
+			// act
+			string line = await stream.ReadLineAsync();
+
+			// assert
+			Assert.IsNull(line);
+
+			stream.Dispose();
+		}
+
+		private class WriteOnlyStream : Stream
+		{
+			public override bool CanRead => false;
+
+			public override bool CanSeek => false;
+
+			public override bool CanWrite => true;
+
+			public override long Length => 0;
+
+			public override long Position { get => 0; set => throw new NotImplementedException(); }
+
+			public override void Flush()
+			{ }
+
+			public override int Read(byte[] buffer, int offset, int count) => 0;
+
+			public override long Seek(long offset, SeekOrigin origin) => 0;
+
+			public override void SetLength(long value)
+			{ }
+
+			public override void Write(byte[] buffer, int offset, int count)
+			{ }
+		}
+	}
+}