Adding comments tests

--- 
+++ 
@@ -15,16 +15,24 @@
     return await create_post("Test Post", async_client)


+@pytest.fixture()
+async def created_comment(async_client: AsyncClient, created_post: dict):
+    response = await async_client.post(
+        "/comment",
+        json={"body": "Test Comment", "post_id": created_post["id"]},
+    )
+    return response.json()
+
+
 @pytest.mark.anyio
 async def test_create_post(async_client: AsyncClient):
     body = "Test Post"
-
     response = await async_client.post(
         "/post",
         json={"body": body},
     )
     assert response.status_code == 201
-    assert {"id": 0, "body": body}.items() <= response.json().items()
+    assert {"id": 0, "body": "Test Post"}.items() <= response.json().items()


 @pytest.mark.anyio
@@ -41,3 +49,51 @@
     response = await async_client.get("/post")
     assert response.status_code == 200
     assert response.json() == [created_post]
+
+
+@pytest.mark.anyio
+async def test_create_comment(
+    async_client: AsyncClient,
+    created_post: dict,
+):
+    body = "Test Comment"
+
+    response = await async_client.post(
+        "/comment",
+        json={"body": body, "post_id": created_post["id"]},
+    )
+    assert response.status_code == 201
+    assert {
+        "id": 0,
+        "body": body,
+        "post_id": created_post["id"],
+    }.items() <= response.json().items()
+
+
+@pytest.mark.anyio
+async def test_get_comments_on_post(
+    async_client: AsyncClient, created_post: dict, created_comment: dict
+):
+    response = await async_client.get(f"/post/{created_post['id']}/comment")
+    assert response.status_code == 200
+    assert response.json() == [created_comment]
+
+
+@pytest.mark.anyio
+async def test_get_post_with_comments(
+    async_client: AsyncClient, created_post: dict, created_comment: dict
+):
+    response = await async_client.get(f"/post/{created_post['id']}")
+    assert response.status_code == 200
+    assert response.json() == {
+        "post": created_post,
+        "comments": [created_comment],
+    }
+
+
+@pytest.mark.anyio
+async def test_get_missing_post_with_comments(
+    async_client: AsyncClient, created_post: dict, created_comment: dict
+):
+    response = await async_client.get("/post/2")
+    assert response.status_code == 404