Add automatic cargo testing script (python) for all exercises

rust/test.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+
+from pathlib import Path
+import re
+from subprocess import Popen, PIPE
+from typing import List, Tuple
+
+CURRENT_DIR = Path(__file__).parent
+
+
+def main() -> None:
+    # Find all tests
+    test_directories: List[Path] = [x for x in CURRENT_DIR.iterdir(
+    ) if x.is_dir() and x.joinpath("Cargo.toml").exists()]
+
+    for directory_path in test_directories:
+        passed, total = test_directory(directory_path)
+
+        print(f"{directory_path.name}: {passed}/{total}")
+
+
+def test_directory(path: Path) -> Tuple[int, int]:
+    targets = list(
+        filter(
+            lambda target: target.suffix == ".rs",
+            path.joinpath("tests").iterdir()
+        )
+    )
+
+    passed, total = 0, 0
+
+    for target in targets:
+        results = test_target(path, target)
+        passed += results[0]
+        total += results[1]
+
+    return passed, total
+
+
+def test_target(base_directory: Path, target: Path) -> Tuple[int, int]:
+    process = Popen(["cargo", "test", "--no-fail-fast", "--test", target.stem, "--", "--include-ignored"], cwd=base_directory, stdout=PIPE, stderr=PIPE)
+    process.wait()
+
+    stdout = process.stdout.read().decode("utf-8").strip().split("\n")
+    
+    total_tests = int(re.match(r"running (\d+) tests?", stdout[0]).group(1))
+    results_match = re.search(r"test result: (.+). (\d+) passed;", stdout[-1])
+    passed_tests = int(results_match.group(2))
+    test_status = results_match.group(1)
+
+    # Unstable
+    if total_tests == passed_tests:
+        assert test_status == "ok"
+    else:
+        assert test_status != "ok"
+
+    return passed_tests, total_tests
+
+
+if __name__ == "__main__":
+    main()