Create test for accessing many to many data through id. ie articles/…

src/Examples/JsonApiDotNetCoreExample/Controllers/TagsController.cs

@@ -0,0 +1,15 @@
+using JsonApiDotNetCore.Controllers;
+using JsonApiDotNetCore.Services;
+using JsonApiDotNetCoreExample.Models;
+
+namespace JsonApiDotNetCoreExample.Controllers
+{
+    public class TagsController : JsonApiController<Tag>
+    {
+        public TagsController(
+            IJsonApiContext jsonApiContext,
+            IResourceService<Tag> resourceService)
+            : base(jsonApiContext, resourceService)
+        { }
+    }
+}

test/JsonApiDotNetCoreExampleTests/Acceptance/ManyToManyTests.cs

@@ -30,7 +30,38 @@ public ManyToManyTests(TestFixture<TestStartup> fixture)
         {
             _fixture = fixture;
         }
+        [Fact]
+        public async Task Can_Fetch_Many_To_Many_Through_Id()
+        {
+            // arrange
+            var context = _fixture.GetService<AppDbContext>();
+            var article = _articleFaker.Generate();
+            var tag = _tagFaker.Generate();
+            var articleTag = new ArticleTag
+            {
+                Article = article,
+                Tag = tag
+            };
+            context.ArticleTags.Add(articleTag);
+            await context.SaveChangesAsync();
 
+            var route = $"/api/v1/articles/{article.Id}/tags";
+            // act
+            var response = await _fixture.Client.GetAsync(route);
+
+            // assert
+            var body = await response.Content.ReadAsStringAsync();
+            Assert.True(HttpStatusCode.OK == response.StatusCode, $"{route} returned {response.StatusCode} status code with payload: {body}");
+
+            var document = JsonConvert.DeserializeObject<Document>(body);
+            Assert.NotNull(document.Data);
+
+            var tagResponse = _fixture.GetService<IJsonApiDeSerializer>().Deserialize<Tag>(body);
+            Assert.NotNull(tagResponse);
+            Assert.Equal(tag.Id, tagResponse.Id);
+            Assert.Equal(tag.Name, tagResponse.Name);
+
+        }
         [Fact]
         public async Task Can_Fetch_Many_To_Many_Through_All()
         {