feat: allow players to leave sessions

tests/GmRelay.Bot.Tests/Features/Sessions/CreateSession/SessionCapacityRulesTests.cs

@@ -28,4 +28,26 @@ public sealed class SessionCapacityRulesTests
         Assert.False(SessionCapacityRules.CanPromoteWaitlistedPlayer(maxPlayers: 3, activeParticipants: 3, waitlistedParticipants: 1));
         Assert.False(SessionCapacityRules.CanPromoteWaitlistedPlayer(maxPlayers: 3, activeParticipants: 2, waitlistedParticipants: 0));
     }
+
+    [Fact]
+    public void ShouldPromoteAfterParticipantLeaves_ShouldOnlyPromoteAfterActiveParticipantLeaves()
+    {
+        Assert.True(SessionCapacityRules.ShouldPromoteAfterParticipantLeaves(
+            removedRegistrationStatus: ParticipantRegistrationStatus.Active,
+            maxPlayers: 2,
+            activeParticipantsAfterLeave: 1,
+            waitlistedParticipants: 1));
+
+        Assert.False(SessionCapacityRules.ShouldPromoteAfterParticipantLeaves(
+            removedRegistrationStatus: ParticipantRegistrationStatus.Waitlisted,
+            maxPlayers: 2,
+            activeParticipantsAfterLeave: 1,
+            waitlistedParticipants: 1));
+
+        Assert.False(SessionCapacityRules.ShouldPromoteAfterParticipantLeaves(
+            removedRegistrationStatus: ParticipantRegistrationStatus.Active,
+            maxPlayers: 2,
+            activeParticipantsAfterLeave: 1,
+            waitlistedParticipants: 0));
+    }
 }

tests/GmRelay.Bot.Tests/Rendering/SessionBatchRendererTests.cs

@@ -42,13 +42,15 @@ public sealed class SessionBatchRendererTests
         Assert.Contains("Лист ожидания (1)", text);
         Assert.Contains("Charlie", text);
         Assert.Contains("Bob", text);
-        Assert.Equal(2, result.Markup.InlineKeyboard.Count());
+        Assert.Equal(4, result.Markup.InlineKeyboard.Count());
         Assert.Collection(
             buttons.Select(button => button.CallbackData),
             callbackData => Assert.Equal($"join_session:{firstSessionId}", callbackData),
+            callbackData => Assert.Equal($"leave_session:{firstSessionId}", callbackData),
             callbackData => Assert.Equal($"cancel_session:{firstSessionId}", callbackData),
             callbackData => Assert.Equal($"reschedule_session:{firstSessionId}", callbackData),
             callbackData => Assert.Equal($"join_session:{secondSessionId}", callbackData),
+            callbackData => Assert.Equal($"leave_session:{secondSessionId}", callbackData),
             callbackData => Assert.Equal($"cancel_session:{secondSessionId}", callbackData),
             callbackData => Assert.Equal($"reschedule_session:{secondSessionId}", callbackData),
             callbackData => Assert.Equal($"promote_waitlist:{secondSessionId}", callbackData));