Add lambda tests and ci cd

.github/workflows/frontend-cicd.yaml

@@ -6,6 +6,27 @@ on:
       - main
 
 jobs:
+  backend-testing:
+    runs-on: ubuntu-latest
+    name: Backend Testing
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+
+      - name: Set up python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11.9"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r infra/lambda/requirements.txt
+
+      - name: Run tests
+        run: |
+          pytest --cov=infra/lambda
+
   terraform:
     name: Terraform Infrastructure
     runs-on: ubuntu-latest

.gitignore

@@ -0,0 +1,2 @@
+.coverage
+.pytest_cache

infra/lambda/.gitignore

@@ -0,0 +1 @@
+__pycache__

infra/lambda/index.py

@@ -1,9 +1,10 @@
 import json
 import boto3
 
-dynamodb = boto3.resource('dynamodb')
+dynamodb = boto3.resource('dynamodb', region_name='ap-southeast-1')
 table = dynamodb.Table('cloud-resume')
 
+
 def lambda_handler(event, context):
     response = table.get_item(
         Key={
@@ -16,7 +17,7 @@ def lambda_handler(event, context):
         Item={
             'id': '1',
             'views': num_views
-        }    
+        }
     )
-    
+
     return num_views

infra/lambda/index_test.py

@@ -0,0 +1,69 @@
+import os
+import pytest
+import boto3
+from moto import mock_aws
+
+
+@pytest.fixture(scope="function")
+def aws_credentials():
+    """
+    Mocked AWS Credentials for moto.
+    """
+
+    os.environ["AWS_ACCESS_KEY_ID"] = "testing"
+    os.environ["AWS_SECRET_ACCESS_KEY"] = "testing"
+    os.environ["AWS_SECURITY_TOKEN"] = "testing"
+    os.environ["AWS_SESSION_TOKEN"] = "testing"
+    os.environ["AWS_DEFAULT_REGION"] = "ap-southeast-1"
+
+
+@pytest.fixture(scope="function")
+def table(aws_credentials):
+    with mock_aws():
+        dynamodb = boto3.resource('dynamodb', region_name='ap-southeast-1')
+        table = dynamodb.create_table(
+            TableName='cloud-resume',
+            KeySchema=[
+                {
+                    'AttributeName': 'id',
+                    'KeyType': 'HASH'
+                }
+            ],
+            AttributeDefinitions=[
+                {
+                    'AttributeName': 'id',
+                    'AttributeType': 'S'
+                }
+            ],
+            ProvisionedThroughput={
+                'ReadCapacityUnits': 1,
+                'WriteCapacityUnits': 1
+            }
+        )
+
+        yield table
+
+
+def test_lambda_increments_viewer_count(table):
+    """
+    Test that the lambda function increments the viewer count by 1
+    """
+
+    table.put_item(
+        Item={
+            'id': '1',
+            'views': 0
+        }
+    )
+
+    from index import lambda_handler
+    response = lambda_handler({}, {})
+    assert response == 1
+
+    # Check that the views have been incremented
+    response = table.get_item(
+        Key={
+            'id': '1'
+        }
+    )
+    assert response['Item']['views'] == 1

infra/lambda/requirements.txt

@@ -0,0 +1,27 @@
+boto3==1.34.151
+botocore==1.34.151
+certifi==2024.7.4
+cffi==1.16.0
+charset-normalizer==3.3.2
+coverage==7.6.0
+cryptography==43.0.0
+idna==3.7
+iniconfig==2.0.0
+Jinja2==3.1.4
+jmespath==1.0.1
+MarkupSafe==2.1.5
+moto==5.0.11
+packaging==24.1
+pluggy==1.5.0
+pycparser==2.22
+pytest==8.3.2
+pytest-cov==5.0.0
+python-dateutil==2.9.0.post0
+PyYAML==6.0.1
+requests==2.32.3
+responses==0.25.3
+s3transfer==0.10.2
+six==1.16.0
+urllib3==2.2.2
+Werkzeug==3.0.3
+xmltodict==0.13.0