test(system): test generic shell calls

tests/test_system.py

@@ -0,0 +1,22 @@
+import pytest
+from selfprivacy_api.actions.system import run_blocking, ShellException
+
+# uname is just an arbitrary command expected to be everywhere we care
+
+
+def test_uname():
+    output = run_blocking(["uname"])
+    assert output is not None
+
+
+def test_uname_new_session():
+    output = run_blocking(["uname"], new_session=True)
+    assert output is not None
+
+
+def test_uname_nonexistent_args():
+    with pytest.raises(ShellException) as exception_info:
+        # uname: extra operand ‘sldfkjsljf’
+        # Try 'uname --help' for more information
+        run_blocking(["uname", "isdyfhishfaisljhkeysmash"], new_session=True)
+    assert "extra operand" in exception_info.value.args[0]