Update to support cisagov/skeleton-python-library v0.1.0

Modify the Dockerfile to include new required arguments for the
`example` entrypoint. Update testing to check for the correct output
including new output since v0.0.1.

Dockerfile

@@ -38,4 +38,4 @@ USER cisa
 EXPOSE 8080/TCP
 VOLUME ["/var/log"]
 ENTRYPOINT ["example"]
-CMD ["--log-level", "DEBUG"]
+CMD ["--log-level", "DEBUG", "4", "2"]

tests/container_test.py

@@ -10,6 +10,7 @@
 
 ENV_VAR = "ECHO_MESSAGE"
 ENV_VAR_VAL = "Hello World from docker compose!"
+DIVISION_RESULT = "4 / 2 == 2.000000"
 READY_MESSAGE = "This is a debug message"
 SECRET_QUOTE = (
     "There are no secrets better kept than the secrets everybody guesses."  # nosec
@@ -52,6 +53,10 @@ def test_output(main_container):
     """Verify the container had the correct output."""
     main_container.wait()  # make sure container exited if running test isolated
     log_output = main_container.logs().decode("utf-8")
+    assert DIVISION_RESULT in log_output, "Division result not found in log output."
+    assert (
+        ENV_VAR_VAL in log_output
+    ), "Environment variable value not found in log output."
     assert SECRET_QUOTE in log_output, "Secret not found in log output."