Build the C program and add tests

.gitlab-ci.yml

+stages:
+  - Build
+  - Test
+
 # Define environment variables for all stages
 #variables:
 #  # Tell docker images where the host docker daemon is
@@ -26,10 +30,25 @@
 #    - if: $BUILD_CI_IMAGE
 #      when: always
 
+build_hello_world:
+  stage: Build
+#  image: gcc:9
+  script:
+    - gcc -o hello src/hello_world.c
+  artifacts:
+    paths:
+      - hello
+
 # Define stage that builds HTML and uploads the website
-python_tests:
+tests:
+  stage: Test
   image: python:3.8-alpine
   tags:
     - ssec_shared
   script:
-    - python my_utils.py
+    - pip install -y pytest pytest-cov
+    - pytest .
+  needs:
+    - job: build_hello_world
+      artifacts: true
+

my_utils.py

+#!/usr/bin/env python
 """Helper methods that aren't actually that helpful.
 
 Just an example.

src/hello_world.c

 #include <stdio.h>
 int main() {
-   printf("Hello, World!");
+   printf("Hello, World!\n");
    return 0;
 }

test.py

+#!/usr/bin/env python
+"""Basic tests using pytest."""
+
+
+def test_hello_world_c():
+    import subprocess
+    bytes_out = subprocess.check_output(['./hello'])
+    assert bytes_out == b'Hello World!\n'
+
+
+def test_hello_world_py():
+    import my_utils
+    my_utils.print_hello()