Add integration test for Query database api

Author: KoditkarVedant

Test/Notion.IntegrationTests/DatabasesClientTests.cs

@@ -0,0 +1,86 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Notion.Client;
+using Xunit;
+
+namespace Notion.IntegrationTests;
+
+public class DatabasesClientTests : IntegrationTestBase, IDisposable
+{
+    private readonly Page _page;
+
+    public DatabasesClientTests()
+    {
+        _page = Client.Pages.CreateAsync(
+            PagesCreateParametersBuilder.Create(
+                new ParentPageInput { PageId = ParentPageId }
+            ).Build()
+        ).Result;
+    }
+
+    public void Dispose()
+    {
+        Client.Pages.UpdateAsync(_page.Id, new PagesUpdateParameters { Archived = true }).Wait();
+    }
+
+    [Fact]
+    public async Task QueryDatabase()
+    {
+        // Arrange
+        var createdDatabase = await CreateDatabaseWithAPageAsync();
+
+
+        // Act
+        var response = await Client.Databases.QueryAsync(createdDatabase.Id, new DatabasesQueryParameters());
+
+        // Assert
+        Assert.NotNull(response.Results);
+        Assert.Single(response.Results);
+        var page = response.Results.Cast<Page>().First();
+        var title = page.Properties["Name"] as TitlePropertyValue;
+        Assert.Equal("Test Title", (title!.Title.Cast<RichTextText>().First()).Text.Content);
+    }
+
+    private async Task<Database> CreateDatabaseWithAPageAsync()
+    {
+        var createDbRequest = new DatabasesCreateParameters
+        {
+            Title = new List<RichTextBaseInput>
+            {
+                new RichTextTextInput
+                {
+                    Text = new Text
+                    {
+                        Content = "Test List",
+                        Link = null
+                    }
+                }
+            },
+            Properties = new Dictionary<string, IPropertySchema>
+            {
+                { "Name", new TitlePropertySchema { Title = new Dictionary<string, object>() } },
+            },
+            Parent = new ParentPageInput { PageId = _page.Id }
+        };
+
+        var createdDatabase = await Client.Databases.CreateAsync(createDbRequest);
+
+        var pagesCreateParameters = PagesCreateParametersBuilder
+            .Create(new DatabaseParentInput { DatabaseId = createdDatabase.Id })
+            .AddProperty("Name",
+                new TitlePropertyValue
+                {
+                    Title = new List<RichTextBase>
+                    {
+                        new RichTextText { Text = new Text { Content = "Test Title" } }
+                    }
+                })
+            .Build();
+
+        await Client.Pages.CreateAsync(pagesCreateParameters);
+
+        return createdDatabase;
+    }
+}