first commit

tests/App.Core.Tests/Licensing/TrialStateTests.cs

@@ -0,0 +1,55 @@
+using App.Core.Services.Licensing;
+
+namespace App.Core.Tests.Licensing;
+
+public class TrialStateTests
+{
+    [Fact]
+    public void GetDaysRemaining_OnInstallDay_Returns30()
+    {
+        var installDate = new DateTime(2026, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+        var state = new TrialState(installDate, "hash", installDate);
+
+        Assert.Equal(30, state.GetDaysRemaining(installDate));
+    }
+
+    [Fact]
+    public void GetDaysRemaining_AfterFifteenDays_Returns15()
+    {
+        var installDate = new DateTime(2026, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+        var state = new TrialState(installDate, "hash", installDate);
+
+        Assert.Equal(15, state.GetDaysRemaining(installDate.AddDays(15)));
+    }
+
+    [Fact]
+    public void GetDaysRemaining_NeverGoesNegative()
+    {
+        var installDate = new DateTime(2026, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+        var state = new TrialState(installDate, "hash", installDate);
+
+        Assert.Equal(0, state.GetDaysRemaining(installDate.AddDays(90)));
+    }
+
+    [Fact]
+    public void IsExpired_ExactlyOnDay30_IsTrue()
+    {
+        var installDate = new DateTime(2026, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+        var state = new TrialState(installDate, "hash", installDate);
+
+        Assert.True(state.IsExpired(installDate.AddDays(30)));
+        Assert.False(state.IsExpired(installDate.AddDays(29)));
+    }
+
+    [Fact]
+    public void WithUpdatedLastRun_DoesNotChangeInstallDate()
+    {
+        var installDate = new DateTime(2026, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+        var state = new TrialState(installDate, "hash", installDate);
+
+        var updated = state.WithUpdatedLastRun(installDate.AddDays(5));
+
+        Assert.Equal(installDate, updated.InstallDateUtc);
+        Assert.Equal(installDate.AddDays(5), updated.LastRunTimestampUtc);
+    }
+}