Add custom campaign roll composer

RpgRoller.Tests/Api/RollVisibilityApiTests.cs

@@ -75,6 +75,19 @@ public sealed class RollVisibilityApiTests : ApiTestBase
         var invalidVisibility = await playerClient.PostAsJsonAsync($"/api/skills/{skill.Id}/roll", new RollSkillRequest("hidden"));
         Assert.Equal(HttpStatusCode.BadRequest, invalidVisibility.StatusCode);
 
+        var customRoll = await PostAsync<CustomRollRequest, RollResult>(playerClient, $"/api/characters/{playerCharacter.Id}/custom-rolls", new("1D+2", "public"));
+        Assert.Equal(Guid.Empty, customRoll.SkillId);
+
+        var customRollLogPage = await GetAsync<CampaignLogPage>(observerClient, $"/api/campaigns/{campaign.Id}/log/page");
+        Assert.Equal(2, customRollLogPage.Entries.Length);
+        Assert.Equal("Custom roll", customRollLogPage.Entries[1].SkillName);
+
+        var invalidCustomRollResponse = await playerClient.PostAsJsonAsync($"/api/characters/{playerCharacter.Id}/custom-rolls", new CustomRollRequest("bad", "public"));
+        Assert.Equal(HttpStatusCode.BadRequest, invalidCustomRollResponse.StatusCode);
+        var invalidCustomRoll = await invalidCustomRollResponse.Content.ReadFromJsonAsync<ApiError>();
+        Assert.NotNull(invalidCustomRoll);
+        Assert.Equal("invalid_expression", invalidCustomRoll.Code);
+
         using var anonymousClient = factory.CreateClient(new() { AllowAutoRedirect = false });
         var unauthorizedCampaignCreate = await anonymousClient.PostAsJsonAsync("/api/campaigns", new CreateCampaignRequest("Nope", "d6"));
         Assert.Equal(HttpStatusCode.Unauthorized, unauthorizedCampaignCreate.StatusCode);