Add comments to the example tests

.github/workflows/run-calculator-ci.yaml

@@ -51,4 +51,4 @@ jobs:
           OUTPUT_RUNS=True python3 your_tests.py | tee ./output.txt \
             && grep -q "TEST RUN:" ./output.txt \
             && rm -f output.txt \
-          || echo "Either your tests failed or you didn't write any!"
+          || (echo "ERROR: Either your tests failed or you didn't write any!" && false)

calculator/tests/example_tests.py

@@ -1,9 +1,14 @@
 #!/usr/bin/env python3
 from calculator_adapter import run
 
+### EXAMPLE TESTS
+# Checks that the program outputs "3" for an input of "1 + 2"
 assert run("1 + 2").output == "3"
+# Checks that the program outputs "8" for an input of "2 * 4"
 assert run("2 * 4").output == "8"
+# Checks that the program exists successfully (no error) for input "2 * 4"
 assert run("2 * 4").exit_status == 0
+# Checks that the program fails (correctly errors) for input "2 @ 3"
 assert run("2 @ 3").exit_status != 0
 
 print("All tests passed!")