Add script to create Python virtual environment

the current file.

.gitea/workflows/unit-tests.yml

@@ -0,0 +1,41 @@
+on:
+  push:
+    branches:
+      - main
+    paths:
+      # Run tests only if Python files change or this workflow file changes
+      - '.gitea/workflows/run-unit-tests.yml'
+      - '**/*.py'
+
+jobs:
+  unit-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.12'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: Run tests
+        run: |
+          ./tests.py
+        env:
+          AZURE_CLIENT_ID: ${{ vars.AZURE_CLIENT_ID }}
+          AZURE_TENANT_ID: ${{ vars.AZURE_TENANT_ID }}
+          AZURE_CLIENT_SECRET: ${{ secrets.AZURE_CLIENT_SECRET }}
+
+      # AI: generated... check validity
+      # - name: Upload test results
+      #   if: always()
+      #   uses: actions/upload-artifact@v2
+      #   with:
+      #     name: test-results
+      #     path: tests/test_results.xml

.gitignore

@@ -4,3 +4,14 @@ __pycache__/
 
 # Ignore sample JSON files
 *.sample.json
+
+# Ignore prototype scripts
+prototype_*.py
+
+# Shell secrets
+*.secret
+
+# Certificate files
+*.pem
+*.key
+*.crt

.vscode/launch.json

@@ -10,6 +10,13 @@
             "request": "launch",
             "program": "${workspaceFolder}/harvester.py",
             "console": "integratedTerminal"
+        },
+        {
+            "name": "Python Debugger: Current File",
+            "type": "debugpy",
+            "request": "launch",
+            "program": "${file}",
+            "console": "integratedTerminal"
         }
     ]
 }

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Slawomir Koszewski (slawek@koszewscy.waw.pl)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,3 +1,5 @@
 # Markdown Docs Harvester
 
+[![Unit Tests](https://gitea.koszewscy.waw.pl/slawek/docs-harvester/actions/workflows/unit-tests.yml/badge.svg)](https://gitea.koszewscy.waw.pl/slawek/docs-harvester/actions?workflow=unit-tests.yml)
+
 This project is designed to harvest and process Markdown documentation files from Git repositories.

harvester.py

@@ -1,7 +1,8 @@
 #!/usr/bin/env python3
 
-from devops import Organization, Project, Repository, Item, DEVOPS_SCOPE
-from azure.identity import DefaultAzureCredential
-from json import dumps
-import tests
+from sk.devops import Organization
+org = Organization("https://dev.azure.com/mcovsandbox")
 
+# print(org.projects["bafe0cf1-6c97-4088-864a-ea6dc02b2727"].repositories["feac266f-84d2-41bc-839b-736925a85eaa"].items["/generate-pat.py"])
+print(org["ADO Sandbox"]["ado-auth-lab"]["/container"].url)
+print(org["ADO Sandbox"]["ado-auth-lab"]["/generate-pat.py"].url)

make-venv.sh

@@ -0,0 +1,8 @@
+#! /usr/bin/env bash
+
+python3 -m venv .venv
+./.venv/bin/pip install --upgrade pip
+./.venv/bin/pip install -r requirements.txt
+
+echo "Add the following alias to your shell configuration file (e.g., .bashrc or .zshrc):"
+echo "alias v_env='test -d $(pwd)/.venv && . $(pwd)/.venv/bin/activate'"

sk/azure.py

@@ -0,0 +1,130 @@
+"""
+Minimal Authentication package for Azure.
+
+Uses client credentials - a secret or a certificate.
+"""
+
+import os, requests
+import re
+import jwt, uuid, time
+from cryptography.hazmat.primitives import serialization
+from cryptography import x509
+import hashlib
+import base64
+
+DEVOPS_SCOPE = "https://app.vssps.visualstudio.com/.default"
+
+def get_token(
+        tenant_id: str | None = None,
+        client_id: str | None = None,
+        client_secret: str | None = None,
+        pem_path: str | None = None
+    ) -> str:
+    """
+    Obtain a token for DevOps using DefaultAzureCredential.
+    """
+    try:
+        if tenant_id and client_id and client_secret:
+            from azure.identity import ClientSecretCredential
+            return ClientSecretCredential(
+                tenant_id=tenant_id,
+                client_id=client_id,
+                client_secret=client_secret
+            ).get_token(DEVOPS_SCOPE).token
+        elif tenant_id and client_id and pem_path:
+            from azure.identity import CertificateCredential
+            return CertificateCredential(
+                tenant_id=tenant_id,
+                client_id=client_id,
+                certificate_path=pem_path
+            ).get_token(DEVOPS_SCOPE).token
+        else:
+            from azure.identity import DefaultAzureCredential
+            return DefaultAzureCredential().get_token(DEVOPS_SCOPE).token
+    except ImportError:
+        if tenant_id and client_id and client_secret:
+            return secret_credentials_auth(
+                tenant_id=tenant_id,
+                client_id=client_id,
+                client_secret=client_secret
+            )
+        elif tenant_id and client_id and pem_path:
+            return certificate_credentials_auth(
+                tenant_id=tenant_id,
+                client_id=client_id,
+                pem_path=pem_path
+            )
+        else:
+            raise ValueError("Either client_secret or pem_path must be provided, if no azure-identity package is installed.")
+
+def secret_credentials_auth(
+        scope: str = DEVOPS_SCOPE,
+        tenant_id: str = os.environ.get("AZURE_TENANT_ID", ""),
+        client_id: str = os.environ.get("AZURE_CLIENT_ID", ""),
+        client_secret: str = os.environ.get("AZURE_CLIENT_SECRET")
+        ) -> str:
+    """
+    Authenticate using client credentials. Pass credentials via environment variables,
+    or directly as function parameters.
+    """
+    token_url = f"https://login.microsoftonline.com/{tenant_id}/oauth2/v2.0/token"
+    r = requests.get(token_url, data={
+        "grant_type": "client_credentials",
+        "client_id": client_id,
+        "client_secret": client_secret,
+        "scope": scope
+    })
+    r.raise_for_status()
+    return r.json().get("access_token", "")
+
+def certificate_credentials_auth(
+        scope: str = DEVOPS_SCOPE,
+        tenant_id: str = os.environ.get("AZURE_TENANT_ID", ""),
+        client_id: str = os.environ.get("AZURE_CLIENT_ID", ""),
+        pem_path: str = os.environ.get("AZURE_CLIENT_CERTIFICATE_PATH", "")
+        ) -> str:
+    """
+    Authenticate using client credentials with a certificate.
+    Pass credentials via environment variables, or directly as function parameters.
+    """
+    token_url = f"https://login.microsoftonline.com/{tenant_id}/oauth2/v2.0/token"
+
+    # Wczytaj klucz prywatny (RSA)
+    with open(pem_path, "rb") as f:
+        pem = f.read()
+        key_pem  = re.search(b"-----BEGIN (?:RSA )?PRIVATE KEY-----.*?END (?:RSA )?PRIVATE KEY-----", pem, re.S).group(0)
+        cert_pem = re.search(b"-----BEGIN CERTIFICATE-----.*?END CERTIFICATE-----", pem, re.S).group(0)
+
+        private_key = serialization.load_pem_private_key(key_pem, password=None)
+        cert = x509.load_pem_x509_certificate(cert_pem)
+
+        der = cert.public_bytes(serialization.Encoding.DER)
+        sha1 = hashlib.sha1(der).digest()
+        x5t  = base64.urlsafe_b64encode(sha1).rstrip(b"=").decode("ascii")
+
+    # Stwórz client_assertion JWT
+    now = int(time.time())
+    claims = {
+        "iss": client_id,
+        "sub": client_id,
+        "aud": token_url,
+        "jti": str(uuid.uuid4()),
+        "iat": now,
+        "exp": now + 600,
+    }
+
+    headers = {"x5t": x5t, "kid": x5t}
+
+    assertion = jwt.encode(claims, private_key, algorithm="RS256", headers=headers)
+
+    data = {
+        "grant_type": "client_credentials",
+        "client_id": client_id,
+        "scope": scope,
+        "client_assertion_type": "urn:ietf:params:oauth:client-assertion-type:jwt-bearer",
+        "client_assertion": assertion,
+    }
+
+    r = requests.post(token_url, data=data)
+    r.raise_for_status()
+    return r.json().get("access_token")

sk/certificates.py

@@ -0,0 +1,161 @@
+import datetime
+from io import BufferedWriter
+import re
+import cryptography.x509 as x509
+from cryptography.hazmat.primitives import hashes, serialization
+from cryptography.hazmat.primitives.asymmetric import rsa
+from cryptography.hazmat.primitives.asymmetric.types import PrivateKeyTypes
+import pathlib
+
+def read_private_key(pem_path: str) -> PrivateKeyTypes:
+    """
+    Read a PEM file and extract the private key in bytes.
+    """
+    with open(pem_path, "rb") as f:
+        pem = f.read()
+        key_pem = re.search(b"-----BEGIN (?:RSA )?PRIVATE KEY-----.*?END (?:RSA )?PRIVATE KEY-----", pem, re.S).group(0)
+        key = serialization.load_pem_private_key(key_pem, password=None)
+        return key
+
+def read_public_certificate(pem_path: str) -> any:
+    """
+    Read a PEM file and extract the public certificate.
+    """
+    with open(pem_path, "rb") as f:
+        pem = f.read()
+        cert_pem = re.search(b"-----BEGIN CERTIFICATE-----.*?END CERTIFICATE-----", pem, re.S).group(0)
+        cert = x509.load_pem_x509_certificate(cert_pem)
+        return cert
+
+def _write_pem_key(
+        writer: BufferedWriter,
+        key: PrivateKeyTypes,
+        encoding: serialization.Encoding = serialization.Encoding.PEM,
+        format: serialization.PrivateFormat = serialization.PrivateFormat.PKCS8,
+        password: str | None = None
+):
+    """
+    Write a PEM encoded private key to the given writer.
+    Allows optional password protection.
+    """
+    if password:
+        encryption_algorithm = serialization.BestAvailableEncryption(password.encode())
+    else:
+        encryption_algorithm = serialization.NoEncryption()
+
+    key_pem = key.private_bytes(
+        encoding=encoding,
+        format=format,
+        encryption_algorithm=encryption_algorithm,
+    )
+    writer.write(key_pem)
+
+def _write_pem_cert(
+        writer: BufferedWriter,
+        cert: x509.Certificate,
+        encoding: serialization.Encoding = serialization.Encoding.PEM
+        ):
+    cert_pem = cert.public_bytes(encoding=encoding)
+    writer.write(cert_pem)
+
+def write_pem_file(
+        pem_file: pathlib.Path,
+        cert: x509.Certificate | None = None,
+        key: PrivateKeyTypes | None = None,
+        encoding: serialization.Encoding = serialization.Encoding.PEM,
+        key_serialization_format: serialization.PrivateFormat = serialization.PrivateFormat.PKCS8,
+        password: str | None = None
+        ):
+    """
+    Write the certificate and/or private key to a PEM file.
+    """
+    with open(pem_file, "wb") as f:
+        if cert:
+            _write_pem_cert(
+                f,
+                cert,
+                encoding=encoding
+                )
+        if key:
+            _write_pem_key(
+                f,
+                key,
+                encoding=encoding,
+                password=password,
+                format=key_serialization_format
+                )
+
+def create_self_signed_certificate(
+        file_path: str,
+        subject_name: str,
+        organization_name: str,
+        country_name: str,
+        valid_days: int = 365,
+        key_size: int = 2048
+):
+    """
+    Create a self-signed certificate. It saves the certificate and private key
+    in PEM format to the specified file path. Three files are created:
+
+    - <file_path>.crt : The public certificate
+    - <file_path>.key : The private key
+    - <file_path>.pem : The certificate and private key combined in one file
+
+    :param file_path: Base file path to save the certificate and key.
+    :param subject_name: Common Name (CN) for the certificate.
+    :param organization_name: Organization Name (O) for the certificate.
+    :param country_name: Country Name (C) for the certificate.
+    :param valid_days: Number of days the certificate is valid for.
+    :param key_size: Size of the RSA key.
+
+    Use the following command to replace any credentials already defined for the 
+    App Registration with that certificate:
+    
+    az ad app credential reset --id <CLIENT_ID> --cert @<file_path>.crt
+
+    Use --append to add the certificate without removing existing credentials.
+
+    > Note: Do not upload the private key file (.key) nor the combined PEM file (.pem).
+    """
+    key = rsa.generate_private_key(public_exponent=65537, key_size=key_size)
+
+    subject = issuer = x509.Name([
+        x509.oid.NameAttribute(x509.oid.NameOID.COUNTRY_NAME, country_name),
+        x509.oid.NameAttribute(x509.oid.NameOID.ORGANIZATION_NAME, organization_name),
+        x509.oid.NameAttribute(x509.oid.NameOID.COMMON_NAME, subject_name),
+    ])
+
+    cert = (
+        x509.CertificateBuilder()
+        .subject_name(subject)
+        .issuer_name(issuer)
+        .public_key(key.public_key())
+        .serial_number(x509.random_serial_number())
+        .not_valid_before(datetime.datetime.now(datetime.timezone.utc) - datetime.timedelta(days=1))
+        .not_valid_after(datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(days=valid_days))
+        .add_extension(x509.BasicConstraints(ca=True, path_length=None), critical=True)
+        .sign(key, hashes.SHA256())
+    )
+
+    crt_path = pathlib.Path(file_path).with_suffix('.crt')
+    key_path = pathlib.Path(file_path).with_suffix('.key')
+    pem_path = pathlib.Path(file_path).with_suffix('.pem')
+
+    public_key = cert.public_bytes(serialization.Encoding.PEM)
+    private_key = key.private_bytes(
+        encoding=serialization.Encoding.PEM,
+        format=serialization.PrivateFormat.TraditionalOpenSSL,
+        encryption_algorithm=serialization.NoEncryption(),
+    )
+
+    # Write the certificate
+    write_pem_file(crt_path, cert=cert)
+    # Write the private key
+    write_pem_file(key_path, key=key)
+    # Write both to a combined PEM file
+    write_pem_file(pem_path, cert=cert, key=key)
+
+    print(f"Certificate created and saved.")
+    print(f" - Certificate: {crt_path}")
+    print(f" - Private Key: {key_path}")
+    print(f" - PEM File: {pem_path}")

sk/devops.py

@@ -1,13 +1,14 @@
+from __future__ import annotations
 import requests
 import urllib.parse
 from uuid import UUID
-from azure.identity import DefaultAzureCredential
+from string import Template
 
 DEVOPS_SCOPE = "https://app.vssps.visualstudio.com/.default"
 DEVOPS_API_VERSION = "7.1"
 
 # Define a class decorator
-def auto_properties(mapping: dict[str,str] | None = None):
+def auto_properties(mapping: dict[str,str]):
 
     def make_property(name: str):
         private_var = f"_{name}"
@@ -53,6 +54,15 @@ def auto_properties(mapping: dict[str,str] | None = None):
         return cls
     return decorator
 
+def devops(key: str, get_url: str, list_url: str = None, params: dict = {}):
+    def decorator(cls):
+        cls.__entity_key__ = key
+        cls.__entity_get_url__ = get_url # Use $key in the URL
+        cls.__entity_list_url__ = list_url # Use $key in the URL
+        cls.__entity_params__ = params
+        return cls
+    return decorator
+
 class DevOps():
     """Base class for DevOps entities."""
 
@@ -77,7 +87,24 @@ class DevOps():
         r.raise_for_status() # Ensure we raise an error for bad responses
         return r
 
-    def _get_entity(self, key_name: str, get_url: str, params: dict = {}) -> object:
+    def _get(self, key: str):
+        if not hasattr(self.__class__, "__entity_key__") or not hasattr(self.__class__, "__entity_get_url__"):
+            raise NotImplementedError("Called _get on a class that has not been decorated with @devops.")
+        setattr(self, f"_{self.__class__.__entity_key__}", key) # Set the entity key
+        # Build the URL
+        url = Template(self.__class__.__entity_get_url__).substitute(key=key)
+        # Build parameters with key substituted
+        params = {}
+        if hasattr(self.__class__, "__entity_params__"):
+            params = {k: Template(v).substitute(key=key) for k, v in self.__class__.__entity_params__.items()}
+
+        # Fetch the object data from the URL
+        r = self._get_url_path(url, params=params)
+
+        # Populate attributes
+        self.from_json(r.json())
+
+    def _get_entity(self, key_name: str, get_url: str, params: dict = {}):
         """
         Each entity class can use this method to populate its attributes, by defining
         its own _get method that calls this one with the key name,
@@ -107,22 +134,29 @@ class DevOps():
 
 class Organization(DevOps):
     def __init__(self, org_url: str, token: str | None = None, api_version: str = DEVOPS_API_VERSION):
-        if token is None:
-            token = DefaultAzureCredential().get_token(DEVOPS_SCOPE).token
         super().__init__(org_url, token, api_version)
 
     @property
     def projects(self):
-        return self._entities(
-            entity_class=Project,
-            key_name="id",
-            list_url="_apis/projects")
+        if not hasattr(self, "_projects"):
+            self._projects = self._entities(
+                entity_class=Project,
+                key_name="id",
+                list_url="_apis/projects")
+        return self._projects
+
+    def __getitem__(self, key: str) -> Project:
+        for project in self.projects:
+            if project.id == key or project.name == key:
+                return project
+        raise KeyError(f"Project with ID or name '{key}' not found.")
 
 @auto_properties({
     "name":        "name",
     "url":         "url",
     "description": "description"
     })
+@devops("id", "_apis/projects/$key", "_apis/projects")
 class Project(DevOps):
     def _get(self):
         self._get_entity(
@@ -149,10 +183,18 @@ class Project(DevOps):
 
     @property
     def repositories(self):
-        return self._entities(
-            entity_class=Repository,
-            key_name="id",
-            list_url=f"{self._id}/_apis/git/repositories")
+        if not hasattr(self, "_repositories"):
+            self._repositories = self._entities(
+                entity_class=Repository,
+                key_name="id",
+                list_url=f"{self._id}/_apis/git/repositories")
+        return self._repositories
+
+    def __getitem__(self, key: str) -> Repository:
+        for repo in self.repositories:
+            if repo.id == key or repo.name == key:
+                return repo
+        raise KeyError(f"Repository with ID or name '{key}' not found.")
 
 @auto_properties({
     "name": "name",
@@ -201,16 +243,23 @@ class Repository(DevOps):
 
     @property
     def items(self):
-        # GET https://dev.azure.com/{organization}/{project}/_apis/git/repositories/{repositoryId}/items?api-version=7.1
-        return self._entities(
-            entity_class=Item,
-            key_name="path",
-            list_url=f"{self._project.id}/_apis/git/repositories/{self._id}/items",
-            params={
-                "scopePath": "/",
-                "recursionLevel": "oneLevel"
-            }
-        )
+        if not hasattr(self, "_items"):
+            self._items = self._entities(
+                entity_class=Item,
+                key_name="path",
+                list_url=f"{self._project.id}/_apis/git/repositories/{self._id}/items",
+                params={
+                    "scopePath": "/",
+                    "recursionLevel": "oneLevel"
+                }
+            )
+        return self._items
+
+    def __getitem__(self, key: str) -> Item:
+        for item in self.items:
+            if item.path == key:
+                return item
+        raise KeyError(f"Item with path '{key}' not found.")
 
 @auto_properties({
     "object_id":       "objectId",

tests.py

@@ -1,51 +1,127 @@
 #!/usr/bin/env python3
 import unittest
-from devops import Organization, Repository, Project, Item
+import requests
+from sk.devops import Organization, Repository, Project, Item
+from sk.azure import get_token
 
-# Setup the Organization object outside the test class to speed up tests.
+# Get the token outside the test class to speed up tests.
 # Each Unit test instantinates the class, so doing it here avoids repeated authentication.
-org = Organization("https://dev.azure.com/mcovsandbox")
+token = get_token()
 
-class TestDevOps(unittest.TestCase):
+class Test01(unittest.TestCase):
     def setUp(self):
-        self.org = org
+        self.org = Organization("https://dev.azure.com/mcovsandbox", token=token)
 
-    def test_listing_projects_in_organization(self):
-        org = self.org
-        projects = list(org.projects)
-        self.assertGreater(len(projects), 0)
+    def test_01(self):
+        """Listing projects in the organization"""
+        self.assertGreater(len(list(self.org.projects)), 0)
+    def test_02(self):
+        """Getting a specific project by ID (object instantiation)"""
+        project = Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727")
+        self.assertEqual(project.id, "bafe0cf1-6c97-4088-864a-ea6dc02b2727")
+        self.assertEqual(project.name, "ADO Sandbox")
+    def test_03(self):
+        """Getting a specific project by name using org indexing (object retrieval)"""
+        project = self.org["ADO Sandbox"]
+        self.assertEqual(project.id, "bafe0cf1-6c97-4088-864a-ea6dc02b2727")
+        self.assertEqual(project.name, "ADO Sandbox")
+    def test_04(self):
+        """Getting a specific project by ID using org indexing (object retrieval)"""
+        project = self.org["bafe0cf1-6c97-4088-864a-ea6dc02b2727"]
+        self.assertEqual(project.id, "bafe0cf1-6c97-4088-864a-ea6dc02b2727")
+        self.assertEqual(project.name, "ADO Sandbox")
 
-    def test_listing_repositories_in_project(self):
+class Test02(unittest.TestCase):
+    def setUp(self):
+        self.org = Organization("https://dev.azure.com/mcovsandbox", token=token)
+
+    def test_01(self):
+        """Listing repositories in a project"""
         project = Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727")
         repos = list(project.repositories)
         self.assertGreater(len(repos), 0)
 
-    def test_fetching_repository_by_name_or_id(self):
-        project = Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727")
-        self.assertIsNotNone(project)
-        repo_by_name = Repository(project, id="ado-auth-lab")
-        self.assertIsNotNone(repo_by_name)
-        self.assertEqual(repo_by_name.name, "ado-auth-lab")
-        self.assertEqual(repo_by_name.id, "feac266f-84d2-41bc-839b-736925a85eaa")
-        repo_by_id = Repository(project, id="feac266f-84d2-41bc-839b-736925a85eaa")
-        self.assertEqual(repo_by_id.name, "ado-auth-lab")
-        self.assertEqual(repo_by_id.id, "feac266f-84d2-41bc-839b-736925a85eaa")
-
-    def test_listing_items_in_repository(self):
+    def test_02(self):
+        """Getting a specific repository by ID (object instantiation)"""
         repo = Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa")
-        items = list(repo.items)
-        self.assertGreater(len(items), 0)
+        self.assertEqual(repo.id, "feac266f-84d2-41bc-839b-736925a85eaa")
+        self.assertEqual(repo.name, "ado-auth-lab")
 
-    def test_getting_specific_item_details(self):
+    def test_03(self):
+        """Getting a specific repository by name using project indexing (object retrieval)"""
+        project = Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727")
+        repo = project["ado-auth-lab"]
+        self.assertEqual(repo.id, "feac266f-84d2-41bc-839b-736925a85eaa")
+        self.assertEqual(repo.name, "ado-auth-lab")
+
+    def test_04(self):
+        """Getting a specific repository by ID using project indexing (object retrieval)"""
+        project = Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727")
+        repo = project["feac266f-84d2-41bc-839b-736925a85eaa"]
+        self.assertEqual(repo.id, "feac266f-84d2-41bc-839b-736925a85eaa")
+        self.assertEqual(repo.name, "ado-auth-lab")
+
+class Test03(unittest.TestCase):
+    def setUp(self):
+        self.org = Organization("https://dev.azure.com/mcovsandbox", token=token)
+
+    def test_01(self):
+        """Getting details of a specific item in a repository"""
         item = Item(Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa"), path="/generate-pat.py")
         self.assertEqual(item.path, "/generate-pat.py")
         self.assertIsNotNone(item.commit_id)
 
-    def test_listing_descendant_items_in_folder(self):
+    def test_02(self):
+        """Listing items in a folder within a repository"""
         repo = Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa")
         docs_item = Item(repo, path="/container")
         children = list(docs_item.children)
         self.assertGreater(len(children), 0)
 
+    def test_03(self):
+        """Getting a specific item from a repository using indexing"""
+        repo = Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa")
+        item = repo["/container"]
+        self.assertEqual(item.path, "/container")
+        self.assertTrue(item.is_folder)
+
+    def test_04(self):
+        """Getting a specific item from a repository using indexing"""
+        repo = Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa")
+        item = repo["/generate-pat.py"]
+        self.assertEqual(item.path, "/generate-pat.py")
+        self.assertFalse(item.is_folder)
+
+    def test_05(self):
+        """Attempting to get a non-existent item from a repository using indexing"""
+        repo = Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa")
+        with self.assertRaises(KeyError):
+            repo["/non-existent-file.txt"] # This file does not exist
+
+class Test04(unittest.TestCase):
+    def setUp(self):
+        self.org = Organization("https://dev.azure.com/mcovsandbox", token=token)
+
+    def test_01(self):
+        """Getting details of a specific item in a repository"""
+        item = Item(Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa"), path="/generate-pat.py")
+        self.assertEqual(item.path, "/generate-pat.py")
+        self.assertIsNotNone(item.commit_id)
+
+    def test_02(self):
+        """Trying to instantiate Item for a item that does not exist"""
+        repo = Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa")
+        with self.assertRaises(requests.exceptions.HTTPError):
+            item = Item(repo, path="/non-existent-file.txt")
+            self.assertEqual(item.path, "/non-existent-file.txt")
+            commit_id = item.commit_id # This will raise HTTPError when trying to fetch details of a non-existent item
+
+    def test_03(self):
+        """Listing items in a folder within a repository"""
+        repo = Repository(Project(self.org, id="bafe0cf1-6c97-4088-864a-ea6dc02b2727"), id="feac266f-84d2-41bc-839b-736925a85eaa")
+        item = Item(repo, path="/container")
+        children = list(item.children)
+        self.assertGreater(len(children), 0)
+
 if __name__ == "__main__":
     unittest.main()