cli main help test

tests/test_cli_help.py

@@ -0,0 +1,63 @@
+import sys
+from contextlib import nullcontext
+
+import pytest
+
+from clifinance.main.app import main
+
+app = "src/clifinance/main/app.py"
+
+main_help_out = [
+    "usage:",
+    "app.py",
+    "[-h]",
+    "{balance,select,add}",
+    "...",
+    "Cli",
+    "finance",
+    "app",
+    "options:",
+    "-h,",
+    "--help",
+    "show",
+    "this",
+    "help",
+    "message",
+    "and",
+    "exit",
+    "Availeble",
+    "commands:",
+    "{balance,select,add}",
+    "balance",
+    "Get",
+    "balance",
+    "select",
+    "Get",
+    "expenses",
+    "by",
+    "filter",
+    "add",
+    "Add",
+    "new",
+    "expense",
+]
+
+main_help_testdata = [
+    (app, "-h", nullcontext(main_help_out)),
+    (app, "--help", nullcontext(main_help_out)),
+]
+
+
+@pytest.mark.parametrize("app, arg, expectation", main_help_testdata)
+def test_main_help(capsys, app, arg, expectation):
+    with expectation as e:
+        sys.argv = [app, arg]
+
+        with pytest.raises(SystemExit) as excinfo:
+            main()
+
+        out, err = capsys.readouterr()
+
+        assert excinfo.value.code == 0
+        assert err == ""
+        assert out.split() == e