Initial commit (history squashed)

src/StellaOps.Feedser.Source.CertCc.Tests/Internal/CertCcSummaryPlannerTests.cs

@@ -0,0 +1,95 @@
+using System;
+using System.Linq;
+using Microsoft.Extensions.Options;
+using StellaOps.Feedser.Source.CertCc.Configuration;
+using StellaOps.Feedser.Source.CertCc.Internal;
+using StellaOps.Feedser.Source.Common.Cursors;
+using Xunit;
+
+namespace StellaOps.Feedser.Source.CertCc.Tests.Internal;
+
+public sealed class CertCcSummaryPlannerTests
+{
+    [Fact]
+    public void CreatePlan_UsesInitialBackfillWindow()
+    {
+        var options = Options.Create(new CertCcOptions
+        {
+            SummaryWindow = new TimeWindowCursorOptions
+            {
+                WindowSize = TimeSpan.FromDays(30),
+                Overlap = TimeSpan.FromDays(3),
+                InitialBackfill = TimeSpan.FromDays(120),
+                MinimumWindowSize = TimeSpan.FromDays(1),
+            },
+        });
+
+        var timeProvider = new TestTimeProvider(DateTimeOffset.Parse("2025-10-10T12:00:00Z"));
+        var planner = new CertCcSummaryPlanner(options, timeProvider);
+
+        var plan = planner.CreatePlan(state: null);
+
+        Assert.Equal(DateTimeOffset.Parse("2025-06-12T12:00:00Z"), plan.Window.Start);
+        Assert.Equal(DateTimeOffset.Parse("2025-07-12T12:00:00Z"), plan.Window.End);
+
+        Assert.Equal(3, plan.Requests.Count);
+
+        var monthly = plan.Requests.Where(r => r.Scope == CertCcSummaryScope.Monthly).ToArray();
+        Assert.Collection(monthly,
+            request =>
+            {
+                Assert.Equal(2025, request.Year);
+                Assert.Equal(6, request.Month);
+                Assert.Equal("https://www.kb.cert.org/vuls/api/2025/06/summary/", request.Uri.AbsoluteUri);
+            },
+            request =>
+            {
+                Assert.Equal(2025, request.Year);
+                Assert.Equal(7, request.Month);
+                Assert.Equal("https://www.kb.cert.org/vuls/api/2025/07/summary/", request.Uri.AbsoluteUri);
+            });
+
+        var yearly = plan.Requests.Where(r => r.Scope == CertCcSummaryScope.Yearly).ToArray();
+        Assert.Single(yearly);
+        Assert.Equal(2025, yearly[0].Year);
+        Assert.Null(yearly[0].Month);
+        Assert.Equal("https://www.kb.cert.org/vuls/api/2025/summary/", yearly[0].Uri.AbsoluteUri);
+
+        Assert.Equal(plan.Window.End, plan.NextState.LastWindowEnd);
+    }
+
+    [Fact]
+    public void CreatePlan_AdvancesWindowRespectingOverlap()
+    {
+        var options = Options.Create(new CertCcOptions
+        {
+            SummaryWindow = new TimeWindowCursorOptions
+            {
+                WindowSize = TimeSpan.FromDays(30),
+                Overlap = TimeSpan.FromDays(10),
+                InitialBackfill = TimeSpan.FromDays(90),
+                MinimumWindowSize = TimeSpan.FromDays(1),
+            },
+        });
+
+        var timeProvider = new TestTimeProvider(DateTimeOffset.Parse("2025-12-01T00:00:00Z"));
+        var planner = new CertCcSummaryPlanner(options, timeProvider);
+
+        var first = planner.CreatePlan(null);
+        var second = planner.CreatePlan(first.NextState);
+
+        Assert.True(second.Window.Start < second.Window.End);
+        Assert.Equal(first.Window.End - options.Value.SummaryWindow.Overlap, second.Window.Start);
+    }
+
+    private sealed class TestTimeProvider : TimeProvider
+    {
+        private DateTimeOffset _now;
+
+        public TestTimeProvider(DateTimeOffset now) => _now = now;
+
+        public override DateTimeOffset GetUtcNow() => _now;
+
+        public void Advance(TimeSpan delta) => _now = _now.Add(delta);
+    }
+}