feat(docker): Gracefully reload Caddy configuration

CaddyManager.Tests/Services/Docker/DockerServiceTests.cs

@@ -1,5 +1,6 @@
 using CaddyManager.Contracts.Configurations.Docker;
 using CaddyManager.Contracts.Configurations;
+using CaddyManager.Contracts.Docker;
 using CaddyManager.Services.Docker;
 
 namespace CaddyManager.Tests.Services.Docker;
@@ -161,6 +162,63 @@ public class DockerServiceTests
         // Assert
         config.CaddyContainerName.Should().Be("caddy");
         config.DockerHost.Should().Be("unix:///var/run/docker.sock");
+        config.CaddyConfigPathInContainer.Should().Be("/etc/caddy/Caddyfile");
+    }
+
+    /// <summary>
+    /// Tests that a graceful reload against a container that does not exist reports a failure instead of throwing.
+    /// Setup: Points the service at a container name that is guaranteed not to be running.
+    /// Expectation: The service returns an unsuccessful <see cref="CaddyReloadResponse"/> carrying an explanatory
+    /// message, so the UI can surface the problem rather than the caller having to handle exceptions.
+    /// </summary>
+    [Fact]
+    public async Task ReloadCaddyContainerAsync_WithNonExistentContainer_ReturnsFailureResponse()
+    {
+        // Arrange
+        _mockConfigurationsService
+            .Setup(x => x.Get<DockerServiceConfiguration>())
+            .Returns(new DockerServiceConfiguration
+            {
+                CaddyContainerName = "non-existent-container",
+                DockerHost = "unix:///var/run/docker.sock"
+            });
+
+        var service = new DockerService(_mockConfigurationsService.Object);
+
+        // Act
+        var response = await service.ReloadCaddyContainerAsync();
+
+        // Assert
+        response.Success.Should().BeFalse();
+        response.Message.Should().NotBeNullOrWhiteSpace();
+    }
+
+    /// <summary>
+    /// Tests that a graceful reload against an unreachable Docker daemon reports a failure instead of throwing.
+    /// Setup: Points the service at a Docker host that cannot be contacted.
+    /// Expectation: The connection error is captured in the response message, keeping the failure handling uniform
+    /// regardless of whether Docker, the container, or Caddy itself is the cause.
+    /// </summary>
+    [Fact]
+    public async Task ReloadCaddyContainerAsync_WithUnreachableDockerHost_ReturnsFailureResponse()
+    {
+        // Arrange
+        _mockConfigurationsService
+            .Setup(x => x.Get<DockerServiceConfiguration>())
+            .Returns(new DockerServiceConfiguration
+            {
+                CaddyContainerName = "test-caddy",
+                DockerHost = "tcp://unreachable-host:2376"
+            });
+
+        var service = new DockerService(_mockConfigurationsService.Object);
+
+        // Act
+        var response = await service.ReloadCaddyContainerAsync();
+
+        // Assert
+        response.Success.Should().BeFalse();
+        response.Message.Should().NotBeNullOrWhiteSpace();
     }
 
     /// <summary>