improv: include example tests in make tests (#63)

* chore: add example/tests to test paths

* chore: update example tests to remove requirement to manually specify env vars

* chore: try to fix build for python3.6 (install dataclasses backport)

* chore: fix build for python 3.6

* chore: dont run example test on python3.6 since it requires asyncio

Author: Tom McCarthy

Diff for: example/README.md

@@ -1,6 +1,6 @@
 # Summary
 
-This example uses both [tracing](https://github.com/awslabs/aws-lambda-powertools/tree/develop/python#tracing) and [logging](https://github.com/awslabs/aws-lambda-powertools/tree/develop/python#logging) features, includes all environment variables that can be used, and demonstrates how to explicitly disable tracing while running unit tests - That is not necessary when running within SAM CLI as it detects the local env automatically.
+This example uses [tracer](https://awslabs.github.io/aws-lambda-powertools-python/core/tracer/), [metrics](https://awslabs.github.io/aws-lambda-powertools-python/core/metrics/),and [logger](https://awslabs.github.io/aws-lambda-powertools-python/core/logger/) features, includes all environment variables that can be used, and demonstrates how to explicitly disable tracing while running unit tests - That is not necessary when running within SAM CLI as it detects the local env automatically.
 
 **Quick commands**
 
@@ -118,7 +118,7 @@ Tests are defined in the `tests` folder in this project. Use PIP to install the
 ```bash
 example$ pip install -r hello_world/requirements.txt
 example$ pip install -r requirements-dev.txt
-example$ POWERTOOLS_TRACE_DISABLED=1 python -m pytest tests/ -v
+example$ pytest -v
 ```
 
 ## Cleanup

Diff for: example/tests/__init__.py

@@ -1,9 +1,24 @@
 import json
+import os
+import sys
 from dataclasses import dataclass
 
 import pytest
 
-from hello_world import app
+
+@pytest.fixture()
+def env_vars(monkeypatch):
+    monkeypatch.setenv("POWERTOOLS_METRICS_NAMESPACE", "example_namespace")
+    monkeypatch.setenv("POWERTOOLS_SERVICE_NAME", "example_service")
+    monkeypatch.setenv("POWERTOOLS_TRACE_DISABLED", "1")
+
+
+@pytest.fixture()
+def lambda_handler(env_vars):
+    from hello_world import app
+
+    return app.lambda_handler
+
 
 @pytest.fixture()
 def apigw_event():
@@ -61,30 +76,33 @@ def apigw_event():
         "path": "/examplepath",
     }
 
+
 @dataclass
 class Context:
     function_name: str = "test"
     memory_limit_in_mb: int = 128
     invoked_function_arn: str = "arn:aws:lambda:eu-west-1:298026489:function:test"
     aws_request_id: str = "5b441b59-a550-11c8-6564-f1c833cf438c"
 
-def test_lambda_handler(apigw_event, mocker, capsys):
-    ret = app.lambda_handler(apigw_event, Context())
+
+@pytest.mark.skipif(sys.version_info < (3, 7), reason="requires python3.7 or higher")
+def test_lambda_handler(lambda_handler, apigw_event, mocker, capsys):
+    ret = lambda_handler(apigw_event, Context())
     data = json.loads(ret["body"])
 
     output = capsys.readouterr()
-    output = output.out.split('\n')
-    stdout_one_string = '\t'.join(output)
+    output = output.out.split("\n")
+    stdout_one_string = "\t".join(output)
 
     assert ret["statusCode"] == 200
     assert data["message"] == "hello world"
     assert "location" in data
     assert "message" in ret["body"]
     assert "async_http" in data
-    
+
     # assess custom metric was flushed in stdout/logs
-    assert "SuccessfulLocations" in stdout_one_string 
-    assert "ColdStart" in stdout_one_string 
+    assert "SuccessfulLocations" in stdout_one_string
+    assert "ColdStart" in stdout_one_string
     assert "UniqueMetricDimension" in stdout_one_string
 
     # assess our custom middleware ran

Diff for: example/tests/test_handler.py

@@ -46,6 +46,7 @@ radon = "^4.1.0"
 xenon = "^0.7.0"
 flake8-bugbear = "^20.1.4"
 flake8-eradicate = "^0.3.0"
+dataclasses = {version = "*", python = "~3.6"}
 
 [tool.coverage.run]
 source = ["aws_lambda_powertools"]

Diff for: poetry.lock

@@ -1,3 +1,3 @@
 [pytest]
 addopts = -ra --cov --cov-config=.coveragerc
-testpaths = ./tests
+testpaths = ./tests ./example/tests