feat(configmanager): add ConfigFileService with tests

Add config file loading and saving service following TDD approach: - IConfigFileService interface for loading/saving config files - ConfigLoadException for descriptive error handling - ConfigFileService implementation with JSON serialization - Unit tests with mocked IFileSystem dependency
2026-01-19 17:38:20 -05:00
parent 4335286560
commit 54620ccb2e
4 changed files with 158 additions and 0 deletions
@@ -0,0 +1,54 @@
+using JdeScoping.ConfigManager.Models;
+using JdeScoping.ConfigManager.Services;
+
+namespace JdeScoping.ConfigManager.Tests.Services;
+
+public class ConfigFileServiceTests
+{
+    private readonly IFileSystem _fileSystem;
+    private readonly ConfigFileService _sut;
+
+    public ConfigFileServiceTests()
+    {
+        _fileSystem = Substitute.For<IFileSystem>();
+        _sut = new ConfigFileService(_fileSystem);
+    }
+
+    [Fact]
+    public async Task LoadAppSettingsAsync_WithValidJson_ReturnsConfigModel()
+    {
+        // Arrange
+        var json = """
+        {
+            "DataSync": {
+                "Enabled": true,
+                "MaxDegreeOfParallelism": 8
+            }
+        }
+        """;
+        _fileSystem.ReadAllTextAsync(Arg.Any<string>(), Arg.Any<CancellationToken>())
+            .Returns(Task.FromResult(json));
+
+        // Act
+        var result = await _sut.LoadAppSettingsAsync("/config/appsettings.json");
+
+        // Assert
+        result.ShouldNotBeNull();
+        result.DataSync.Enabled.ShouldBeTrue();
+        result.DataSync.MaxDegreeOfParallelism.ShouldBe(8);
+    }
+
+    [Fact]
+    public async Task LoadAppSettingsAsync_WithInvalidJson_ThrowsWithHelpfulMessage()
+    {
+        // Arrange
+        var json = "{ invalid json }";
+        _fileSystem.ReadAllTextAsync(Arg.Any<string>(), Arg.Any<CancellationToken>())
+            .Returns(Task.FromResult(json));
+
+        // Act & Assert
+        var ex = await Should.ThrowAsync<ConfigLoadException>(
+            () => _sut.LoadAppSettingsAsync("/config/appsettings.json"));
+        ex.Message.ShouldContain("parse");
+    }
+}