feat: implement read and write methods for json file storage provider

tests/StevanFreeborn.Extensions.Configuration.Secure.Tests/Unit/Storage/JsonFileStorageProviderTests.cs

@@ -0,0 +1,44 @@
+using StevanFreeborn.Extensions.Configuration.Secure.Storage;
+
+namespace StevanFreeborn.Extensions.Configuration.Secure.Tests.Unit.Storage;
+
+public class JsonFileStorageProviderTests
+{
+  private readonly string _tmpDirectory;
+  private readonly JsonStorageOptions _options;
+  private readonly JsonFileStorageProvider _sut;
+
+  public JsonFileStorageProviderTests()
+  {
+    _tmpDirectory = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
+    Directory.CreateDirectory(_tmpDirectory);
+
+    _options = new()
+    {
+      FileName = "testsettings.json"
+    };
+
+    _sut = new(_options);
+  }
+
+  [Fact]
+  public void Constructor_WhenCalledWithNullOptions_ItShouldThrowArgumentNullException()
+  {
+    var act = static () => new JsonFileStorageProvider(null!);
+
+    act.Should().Throw<ArgumentNullException>();
+  }
+
+  [Fact]
+  public async Task WriteAsync_And_ReadAsync_WhenCalled_ItShouldBeAbleToPersistAndRetrieveValues()
+  {
+    var configKey = "Key";
+    var configValue = "Value";
+
+    await _sut.WriteAsync(configKey, configValue);
+    var result = await _sut.ReadAsync(configKey);
+
+    result.Should().Be(configValue);
+    File.Exists(_options.FullPath).Should().BeTrue();
+  }
+}

tests/StevanFreeborn.Extensions.Configuration.Secure.Tests/Unit/Storage/JsonStorageOptionsTests.cs

@@ -0,0 +1,36 @@
+using StevanFreeborn.Extensions.Configuration.Secure.Storage;
+
+namespace StevanFreeborn.Extensions.Configuration.Secure.Tests.Unit.Storage;
+
+public class JsonStorageOptionsTests
+{
+  [Fact]
+  public void Path_WhenCalledWithFileNameSet_ItShouldReturnExpectedPath()
+  {
+    var fileName = "appsettings.json";
+    var expectedPath = Path.Combine(AppContext.BaseDirectory, fileName);
+
+    var opts = new JsonStorageOptions()
+    {
+      FileName = fileName,
+    };
+
+    opts.FullPath.Should().Be(expectedPath);
+  }
+
+  [Fact]
+  public void Path_WhenCalledWithFileNameAndDirectoryPathSet_ItShouldReturnExpectedPath()
+  {
+    var fileName = "appsettings.json";
+    var directoryPath = @"C:\Path\To\Some\Directory";
+    var expectedPath = Path.Combine(directoryPath, fileName);
+
+    var opts = new JsonStorageOptions()
+    {
+      FileName = fileName,
+      DirectoryPath = directoryPath,
+    };
+
+    opts.FullPath.Should().Be(expectedPath);
+  }
+}