add new tests

+ for code/input/output expected failures (#440)

S26-documentation/04a-input-output.t

@@ -0,0 +1,61 @@
+use v6;
+
+use lib $?FILE.IO.parent(2).add("packages");
+
+use Test;
+use Test::Util;
+
+plan 6;
+
+my $r;
+
+# Tests expected to fail:
+
+my $p1 = Q:to<--END-->;
+=begin code
+say 1;
+say 2;
+=end
+--END--
+
+my $p2 = Q:to<--END-->;
+=begin input
+say 1;
+say 2;
+=end
+--END--
+
+my $p3 = Q:to<--END-->;
+=begin output
+say 1;
+say 2;
+=end
+--END--
+
+my $p4 = Q:to<--END-->;
+=begin code
+say 1;
+say 2;
+=end input
+--END--
+
+my $p5 = Q:to<--END-->;
+=begin input
+say 1;
+say 2;
+=end output
+--END--
+
+my $p6 = Q:to<--END-->;
+=begin output
+say 1;
+say 2;
+=end code
+--END--
+
+for $p1, $p2, $p3, $p4, $p5, $p6 -> $POD {
+    is_run :compiler-args['--doc'], $POD, {
+        # the %wanted hash
+        status => 1,
+    }, 'expected fail of basic --doc check';
+}