Increase OAS description

Parce docstring of http handlers to increase OAS
Remove the not expected definitions key in the OAS

tests/test_oas/test_cmd/oas_base.json

@@ -0,0 +1 @@
+{"info": {"title": "MyApp",  "version": "1.0.0"}}

tests/test_oas/test_cmd/test_cmd.py

@@ -1,10 +1,13 @@
 import argparse
 from textwrap import dedent
-
+from io import StringIO
+from pathlib import Path
 import pytest
 
 from aiohttp_pydantic.oas import cmd
 
+PATH_TO_BASE_JSON_FILE = str(Path(__file__).parent / "oas_base.json")
+
 
 @pytest.fixture
 def cmd_line():
@@ -13,10 +16,11 @@ def cmd_line():
     return parser
 
 
-def test_show_oad_of_app(cmd_line, capfd):
+def test_show_oas_of_app(cmd_line):
     args = cmd_line.parse_args(["tests.test_oas.test_cmd.sample"])
+    args.output = StringIO()
     args.func(args)
-    captured = capfd.readouterr()
+
     expected = dedent(
         """
         {
@@ -57,13 +61,13 @@ def test_show_oad_of_app(cmd_line, capfd):
     """
     )
 
-    assert captured.out.strip() == expected.strip()
+    assert args.output.getvalue().strip() == expected.strip()
 
 
-def test_show_oad_of_sub_app(cmd_line, capfd):
+def test_show_oas_of_sub_app(cmd_line):
     args = cmd_line.parse_args(["tests.test_oas.test_cmd.sample:sub_app"])
+    args.output = StringIO()
     args.func(args)
-    captured = capfd.readouterr()
     expected = dedent(
         """
         {
@@ -89,16 +93,26 @@ def test_show_oad_of_sub_app(cmd_line, capfd):
     """
     )
 
-    assert captured.out.strip() == expected.strip()
+    assert args.output.getvalue().strip() == expected.strip()
 
 
-def test_show_oad_of_a_callable(cmd_line, capfd):
-    args = cmd_line.parse_args(["tests.test_oas.test_cmd.sample:make_app()"])
+def test_show_oas_of_a_callable(cmd_line):
+    args = cmd_line.parse_args(
+        [
+            "tests.test_oas.test_cmd.sample:make_app()",
+            "--base-oas-file",
+            PATH_TO_BASE_JSON_FILE,
+        ]
+    )
+    args.output = StringIO()
     args.func(args)
-    captured = capfd.readouterr()
     expected = dedent(
         """
         {
+        "info": {
+            "title": "MyApp",
+            "version": "1.0.0"
+        },
         "openapi": "3.0.0",
         "paths": {
             "/route-3/{a}": {
@@ -121,4 +135,4 @@ def test_show_oad_of_a_callable(cmd_line, capfd):
     """
     )
 
-    assert captured.out.strip() == expected.strip()
+    assert args.output.getvalue().strip() == expected.strip()