fix(host): resolve Host-005..011 — async startup, HOCON escaping, port-conflict check, dead-config cleanup, migration retry, log-level wiring; Host-002 flagged

tests/ScadaLink.Host.Tests/LoggerConfigurationTests.cs

@@ -0,0 +1,67 @@
+using Microsoft.Extensions.Configuration;
+using Serilog.Events;
+
+namespace ScadaLink.Host.Tests;
+
+/// <summary>
+/// Host-011: <c>ScadaLink:Logging:MinimumLevel</c> must actually drive the Serilog
+/// minimum level. Previously the value was bound into <see cref="LoggingOptions"/>
+/// but never read, so editing it had no effect.
+/// </summary>
+public class LoggerConfigurationTests
+{
+    private static IConfiguration BuildConfig(string? minimumLevel)
+    {
+        var values = new Dictionary<string, string?>();
+        if (minimumLevel != null)
+            values["ScadaLink:Logging:MinimumLevel"] = minimumLevel;
+        return new ConfigurationBuilder().AddInMemoryCollection(values).Build();
+    }
+
+    [Fact]
+    public void MinimumLevel_Warning_SuppressesInformationLogs()
+    {
+        var sink = new InMemorySink();
+        var logger = LoggerConfigurationFactory
+            .Build(BuildConfig("Warning"), "Central", "central", "node1")
+            .WriteTo.Sink(sink)
+            .CreateLogger();
+
+        logger.Information("info message");
+        logger.Warning("warning message");
+
+        Assert.Single(sink.LogEvents);
+        Assert.Equal(LogEventLevel.Warning, sink.LogEvents[0].Level);
+    }
+
+    [Fact]
+    public void MinimumLevel_Debug_AllowsDebugLogs()
+    {
+        var sink = new InMemorySink();
+        var logger = LoggerConfigurationFactory
+            .Build(BuildConfig("Debug"), "Site", "site-a", "node1")
+            .WriteTo.Sink(sink)
+            .CreateLogger();
+
+        logger.Debug("debug message");
+
+        Assert.Single(sink.LogEvents);
+        Assert.Equal(LogEventLevel.Debug, sink.LogEvents[0].Level);
+    }
+
+    [Fact]
+    public void MinimumLevel_Absent_DefaultsToInformation()
+    {
+        var sink = new InMemorySink();
+        var logger = LoggerConfigurationFactory
+            .Build(BuildConfig(null), "Central", "central", "node1")
+            .WriteTo.Sink(sink)
+            .CreateLogger();
+
+        logger.Debug("debug message");
+        logger.Information("info message");
+
+        Assert.Single(sink.LogEvents);
+        Assert.Equal(LogEventLevel.Information, sink.LogEvents[0].Level);
+    }
+}