Add venue service and tests for it

backend/LeedsBeerQuest.API/LeedsBeerQuest.API.Tests/Data/Services/TestData.cs

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+using System;
+using System.Collections.Generic;
+using LeedsBeerQuest.API.Data.Models;
+
+namespace LeedsBeerQuest.API.Tests.Data.Services;
+
+public static class TestData
+{
+    public static IEnumerable<Venue> VenueTestData = new[]
+    {
+        new Venue
+        {
+            Id = 1,
+            Name = "Venue 1",
+            CategoryId = 1,
+            Category = new Category
+                {
+                    Id = 1,
+                    Name = "Category 1"
+                },
+            Url = "Venue URL",
+            DateAttended = new DateTime(),
+            Excerpt = "Venue Excerpt",
+            Thumbnail = "Venue Thumbnail",
+            Latitude = 1.23456m,
+            Longitude = -4.27384m,
+            Address = "Venue 1 Address",
+            Phone = "07777777777",
+            Twitter = "Venue Twitter",
+            StarsBeer = 1.5m,
+            StarsAtmosphere = 3,
+            StarsAmenities = 4.5m,
+            StarsValue = 4,
+            Tags = new List<Tag>()
+        }
+    };
+}

backend/LeedsBeerQuest.API/LeedsBeerQuest.API.Tests/Data/Services/VenueServiceTests.cs

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+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using LeedsBeerQuest.API.Data.Contexts;
+using LeedsBeerQuest.API.Data.Services;
+using Microsoft.EntityFrameworkCore;
+using NUnit.Framework;
+
+namespace LeedsBeerQuest.API.Tests.Data.Services;
+
+[TestFixture]
+public class VenueServiceTests
+{
+    private LeedsBeerQuestDbContext _context;
+    private VenueService _venueService;
+    
+    [SetUp]
+    public void Setup()
+    {
+        var builder = new DbContextOptionsBuilder<LeedsBeerQuestDbContext>()
+            .UseInMemoryDatabase($"VenueServiceTests.{Guid.NewGuid().ToString()}");
+        _context = new LeedsBeerQuestDbContext(builder.Options);
+
+        _venueService = new VenueService(_context);
+    }
+
+    [Test]
+    public async Task GetAllVenues_ReturnsAllVenues_WhenAllVenuesArePresentInDatabase()
+    {
+        var venueTestData = TestData.VenueTestData.ToArray();
+        _context.Venues.AddRange(venueTestData);
+        await _context.SaveChangesAsync();
+
+        var result = await _venueService.GetAllVenues();
+        var resultArray = result.ToArray();
+        
+        Assert.AreEqual(1, resultArray.Length);
+        
+        Assert.AreEqual(venueTestData[0].Id, resultArray[0].Id);
+        Assert.AreEqual(venueTestData[0].Name, resultArray[0].Name);
+    }
+
+    [Test]
+    public async Task GetAllVenues_ReturnsNoVenues_WhenNoVenuesArePresentInDatabase()
+    {
+        var result = await _venueService.GetAllVenues();
+        
+        Assert.AreEqual(0, result.Count());
+    }
+}