Add tests for azure blob stream

ManagedCode.Storage.Azure/BlobStream.cs

@@ -37,18 +37,19 @@ public override long Length
     {
         get
         {
-            var realLength = 0L;
-            var metadata = _pageBlob.GetProperties().Value.Metadata;
+            var properties = _pageBlob.GetProperties();
+            var metadata = properties.Value.Metadata;
             if (metadata.TryGetValue(MetadataLengthKey, out var length))
             {
-                if (long.TryParse(length, out realLength))
+                if (long.TryParse(length, out var realLength))
                 {
                     return realLength;
                 }
             }
-
-            SetLengthInternal(realLength);
-            return realLength;
+
+            var contentLenght = properties.Value.ContentLength;
+            SetLengthInternal(contentLenght);
+            return contentLenght;
         }
     }
 

ManagedCode.Storage.Tests/Common/FileHelper.cs

@@ -25,6 +25,34 @@ public static LocalFile GenerateLocalFile(string fileName, int byteSize)
         return localFile;
     }
 
+    public static LocalFile GenerateLocalFileWithData(LocalFile file, int sizeInBytes)
+    {
+        using (var fileStream = file.FileStream)
+        {
+            Random random = new Random();
+            byte[] buffer = new byte[1024]; // Buffer for writing in chunks
+
+            while (sizeInBytes > 0)
+            {
+                int bytesToWrite = (int) Math.Min(sizeInBytes, buffer.Length);
+
+                for (int i = 0; i < bytesToWrite; i++)
+                {
+                    buffer[i] = (byte) random.Next(65, 91); // 'A' to 'Z'
+                    if (random.Next(2) == 0)
+                    {
+                        buffer[i] = (byte) random.Next(97, 123); // 'a' to 'z'
+                    }
+                }
+
+                fileStream.Write(buffer, 0, bytesToWrite);
+                sizeInBytes -= bytesToWrite;
+            }
+        }
+
+        return file;
+    }
+
     public static IFormFile GenerateFormFile(string fileName, int byteSize)
     {
         var localFile = GenerateLocalFile(fileName, byteSize);

ManagedCode.Storage.Tests/Storages/Azure/AzureBlobStreamTests.cs

@@ -0,0 +1,175 @@
+using System;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+using FluentAssertions;
+using ManagedCode.Storage.Azure;
+using ManagedCode.Storage.Core.Models;
+using ManagedCode.Storage.Tests.Common;
+using Microsoft.Extensions.DependencyInjection;
+using Testcontainers.Azurite;
+using Xunit;
+
+namespace ManagedCode.Storage.Tests.Storages.Azure;
+
+public class AzureBlobStreamTests : StreamTests<AzuriteContainer>
+{
+    protected override AzuriteContainer Build()
+    {
+        return new AzuriteBuilder()
+            .WithImage("mcr.microsoft.com/azure-storage/azurite:3.26.0")
+            .Build();
+    }
+
+    protected override ServiceProvider ConfigureServices()
+    {
+        return AzureConfigurator.ConfigureServices(Container.GetConnectionString());
+    }
+
+    [Fact]
+    public async Task ReadStreamWithStreamReader_WhenFileExists_ReturnData()
+    {
+        // Arrange
+        var directory = "test-directory";
+        var fileSizeInBytes = 10;
+        await using var localFile = LocalFile.FromRandomNameWithExtension(".txt");
+        FileHelper.GenerateLocalFileWithData(localFile, fileSizeInBytes);
+        var storage = (IAzureStorage) Storage;
+
+        UploadOptions options = new() { FileName = localFile.Name, Directory = directory };
+        await using var localFileStream = localFile.FileInfo.OpenRead();
+        var result = await storage.UploadAsync(localFileStream, options);
+
+        await using var blobStream = storage.GetBlobStream(result.Value.FullName);
+
+        // Act
+        using var streamReader = new StreamReader(blobStream);
+        var content = await streamReader.ReadToEndAsync();
+
+        // Assert
+        await using var fileStream = localFile.FileInfo.OpenRead();
+        using var fileReader = new StreamReader(fileStream);
+        var fileContent = await fileReader.ReadToEndAsync();
+        content.Should().NotBeNullOrEmpty();
+        fileContent.Should().NotBeNullOrEmpty();
+        content.Should().Be(fileContent);
+    }
+
+    [Fact]
+    public async Task ReadStream_WhenFileExists_ReturnData()
+    {
+        // Arrange
+        var directory = "test-directory";
+        var fileSizeInBytes = 10;
+        await using var localFile = LocalFile.FromRandomNameWithExtension(".txt");
+        FileHelper.GenerateLocalFileWithData(localFile, fileSizeInBytes);
+        var storage = (IAzureStorage) Storage;
+
+        UploadOptions options = new() { FileName = localFile.Name, Directory = directory };
+        await using var fileStream = localFile.FileInfo.OpenRead();
+        var result = await storage.UploadAsync(fileStream, options);
+
+        await using var blobStream = storage.GetBlobStream(result.Value.FullName);
+
+        var chunkSize = (int) blobStream.Length / 2;
+        var chunk1 = new byte[chunkSize];
+        var chunk2 = new byte[chunkSize];
+
+        // Act
+        var bytesReadForChunk1 = await blobStream.ReadAsync(chunk1, 0, chunkSize);
+        var bytesReadForChunk2 = await blobStream.ReadAsync(chunk2, 0, chunkSize);
+
+        // Assert
+        bytesReadForChunk1.Should().Be(chunkSize);
+        bytesReadForChunk2.Should().Be(chunkSize);
+        chunk1.Should().NotBeNullOrEmpty().And.HaveCount(chunkSize);
+        chunk2.Should().NotBeNullOrEmpty().And.HaveCount(chunkSize);
+    }
+
+    [Fact]
+    public async Task ReadStream_WhenFileDoesNotExists_ReturnNoData()
+    {
+        // Arrange
+        var directory = "test-directory";
+        var storage = (IAzureStorage) Storage;
+        await storage.CreateContainerAsync();
+        var fullFileName = $"{directory}/{Guid.NewGuid()}.txt";
+
+        await using var blobStream = storage.GetBlobStream(fullFileName);
+        var chunk = new byte[4];
+
+        // Act
+        var bytesRead = await blobStream.ReadAsync(chunk, 0, 4);
+
+        // Assert
+        bytesRead.Should().Be(0);
+        chunk.Should().NotBeNullOrEmpty();
+        chunk.Should().AllBeEquivalentTo(0);
+    }
+
+    [Fact]
+    public async Task WriteStreamWithStreamWriter_SaveData()
+    {
+        // Arrange
+        var directory = "test-directory";
+        await using var localFile = LocalFile.FromRandomNameWithExtension(".txt");
+        var fileSizeInBytes = 10;
+        FileHelper.GenerateLocalFileWithData(localFile, fileSizeInBytes);
+        var fullFileName = $"{directory}/{localFile.FileInfo.FullName}";
+
+        var storage = (IAzureStorage) Storage;
+
+        await storage.CreateContainerAsync();
+
+        // Act
+        await using (var blobStream = storage.GetBlobStream(fullFileName))
+        {
+            await using (var localFileStream = localFile.FileStream)
+            {
+                await localFileStream.CopyToAsync(blobStream);
+            }    
+        }
+
+        // Assert
+        var fileResult = await storage.DownloadAsync(fullFileName);
+        fileResult.IsSuccess.Should().BeTrue();
+        fileResult.Value.Should().NotBeNull();
+        await using var fileStream = fileResult.Value.FileStream;
+        using var streamReader = new StreamReader(fileStream);
+        var fileContent = await streamReader.ReadLineAsync();
+        fileContent.Should().NotBeNullOrEmpty();
+    }
+
+    [Fact]
+    public async Task Seek_WhenFileExists_ReturnData()
+    {
+        // Arrange
+        var directory = "test-directory";
+        var fileSizeInBytes = 10;
+        await using var localFile = LocalFile.FromRandomNameWithExtension(".txt");
+        FileHelper.GenerateLocalFileWithData(localFile, fileSizeInBytes);
+        var storage = (IAzureStorage) Storage;
+
+        UploadOptions options = new() { FileName = localFile.Name, Directory = directory };
+        await using var localFileStream = localFile.FileInfo.OpenRead();
+        var result = await storage.UploadAsync(localFileStream, options);
+
+        await using var blobStream = storage.GetBlobStream(result.Value.FullName);
+
+        // Act
+        var seekInPosition = fileSizeInBytes / 2;
+        blobStream.Seek(seekInPosition, SeekOrigin.Current);
+        var buffer = new byte[seekInPosition];
+        var bytesRead = await blobStream.ReadAsync(buffer);
+
+        // Assert
+        bytesRead.Should().Be(seekInPosition);
+        await using var fileStream = localFile.FileInfo.OpenRead();
+        using var fileReader = new StreamReader(fileStream);
+        var fileContent = await fileReader.ReadToEndAsync();
+        var content = Encoding.UTF8.GetString(buffer);
+        content.Should().NotBeNullOrEmpty();
+        var trimmedFileContent = fileContent.Remove(0, seekInPosition); 
+        content.Should().Be(trimmedFileContent);
+    }
+}

ManagedCode.Storage.Tests/Storages/StreamTests.cs

@@ -0,0 +1,12 @@
+using System.Threading.Tasks;
+using DotNet.Testcontainers.Containers;
+using ManagedCode.Storage.Tests.Common;
+using Xunit;
+
+namespace ManagedCode.Storage.Tests.Storages;
+
+public abstract class StreamTests<T> : BaseContainer<T>
+    where T : IContainer
+{
+
+}