update MockingPatching

Author: rambasnet

notebooks/TestingMockingPatching.ipynb

@@ -9,16 +9,16 @@
     "\n",
     "### Topics\n",
     "\n",
-    "- What is Mock?\n",
+    "- the motivation behind mocking/facking/patching objects\n",
+    "- What is a Magic Mock?\n",
     "- use Mock to imitate objects in your tests\n",
     "- check usage data to understand how you use your objects\n",
     "- customize your mock objects' return values and side effects\n",
     "- patch() objects throughout your codebase\n",
     "- common mock problems and avoiding them\n",
     "\n",
-    "## Imitating objects using Mocks\n",
+    "## Motivation\n",
     "\n",
-    "- based on: [https://realpython.com/python-mock-library/](https://realpython.com/python-mock-library/) and [https://docs.python.org/3/library/unittest.mock.html](https://docs.python.org/3/library/unittest.mock.html)\n",
     "- isolated problems are easier to diagnose and solve\n",
     "- if a test fails, diagnosing/debugging many interrelated components can be very difficult\n",
     "    - e.g., why the engine of a gasoline car not firing\n",
@@ -27,15 +27,12 @@
     "    1. isolate a unit under test - create collaborating classes and functions so we can test one unknown component\n",
     "    2. test code that requires an object that is either expensive or risky to use;\n",
     "       - things like shared databases, filesystems, and cloud infrastructures can be very expensive to setup and tear down for testing\n",
-    "- `unittest.mock` module provides Mock base class for mocking objects\n",
-    "- you can pass mock objects as arguments to functions\n",
-    "- assign/patch other objects\n",
-    "- when substituting an object in your code, the Mock must look like the real object it is replacing\n",
-    "    - mock objects must have the same members (attributes and methods) that are being tested\n",
-    "    - e.g., if you're mocking `json` library and your program calls `dumps()`, then the mock object must also contain `dumps()` \n",
-    "- Mock must simulate any object that it replaces\n",
-    "    - Mock creates attributes/members when you access them dynamically!\n",
-    "- Mock methods can take whatever arguments you provide but always return Mock object"
+    "\n",
+    "### Problems\n",
+    "\n",
+    "- two immediate problems we've been facing in solving Kattis problems are:\n",
+    "1. how can we programmatically assert what result the function printed to standard output?\n",
+    "2. how to automate data from standard input with out manually entering the input?"
    ]
   },
   {
@@ -92,6 +89,24 @@
     "stdout.close()"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "bb11055d",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "This is a log file\r\n"
+     ]
+    }
+   ],
+   "source": [
+    "! cat log.txt"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 12,
@@ -121,6 +136,25 @@
     "stdout.write('Back to the console\\n')"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "4e856508",
+   "metadata": {},
+   "source": [
+    "## Imitating objects using Mocks\n",
+    "\n",
+    "- based on: [https://realpython.com/python-mock-library/](https://realpython.com/python-mock-library/) and [https://docs.python.org/3/library/unittest.mock.html](https://docs.python.org/3/library/unittest.mock.html)\n",
+    "- `unittest.mock` module provides Mock base class for mocking objects\n",
+    "- you can pass mock objects as arguments to functions\n",
+    "- assign/patch other objects\n",
+    "- when substituting an object in your code, the Mock must look like the real object it is replacing\n",
+    "    - mock objects must have the same members (attributes and methods) that are being tested\n",
+    "    - e.g., if you're mocking `json` library and your program calls `dumps()`, then the mock object must also contain `dumps()` \n",
+    "- Mock must simulate any object that it replaces\n",
+    "    - Mock creates attributes/members when you access them dynamically!\n",
+    "- Mock methods can take whatever arguments you provide but always return Mock object"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -1807,7 +1841,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -1821,7 +1855,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.1"
+   "version": "3.10.8"
   }
  },
  "nbformat": 4,