check exceptions are raised (as for subprocess.run)

tests.py

@@ -45,6 +45,16 @@ def test_run_method(tmp_path):
             in run(["echo", "Hello, world!"], capture_output=True).stdout
         )
 
+    # check exceptions
+    with pytest.raises(FileNotFoundError):
+        run(["doesnotexistcommand"])
+
+    # check error code is checked
+    # 1. expect this to parse: return code is non-zero, but we don't check
+    run(["ls", "/doesnotexist"]),
+    # 2. expect this to fail:
+    with pytest.raises(subprocess.CalledProcessError):
+        run(["ls", "/doesnotexist"], check=True)
 
 
 def test_prepare_environment(tmp_path):