Add E2E test for incorrect CLI usage

Changes

1 changed files (+20/-0)

• tests/e2e/help.zig
  • @@ -31,3 +31,23 @@ try std.testing.expectEqual(0, result.term.Exited);
    try std.testing.expectEqual(0, result.stderr.len); try std.testing.expect(result.stdout.len > 0); } + + test "should print help to stderr on incorrect usage" { + const normal = try std.process.Child.run(.{ + .allocator = std.testing.allocator, + .argv = &.{ config.bin, "--help" }, + }); + defer std.testing.allocator.free(normal.stderr); + defer std.testing.allocator.free(normal.stdout); + + const incorrect_usage = try std.process.Child.run(.{ + .allocator = std.testing.allocator, + .argv = &.{ config.bin, "--invalid-option" }, + }); + defer std.testing.allocator.free(incorrect_usage.stderr); + defer std.testing.allocator.free(incorrect_usage.stdout); + + try std.testing.expectEqual(15, incorrect_usage.term.Exited); + try std.testing.expectStringEndsWith(incorrect_usage.stderr, normal.stdout); + try std.testing.expectEqualStrings("", incorrect_usage.stdout); + }