Move bare source test to expect

This previously used /dev/tty to make sure we have `source` connected
to a terminal. Only as it turns out, FreeBSD doesn't have that (https://builds.sr.ht/~faho/job/15308).

So instead, let's just use the expect tests since stdin there is by
definition a terminal.

tests/generic.expect

@@ -56,3 +56,8 @@ send_line "echo hoge >|  \n cat"
 expect_prompt "hoge" {} unmatched {
     puts stderr "Error with a pipe with redirection at the end of the line"
 }
+
+send_line "source; or echo failed"
+expect_prompt "failed" {} unmatched {
+    puts stderr "Error with sourcing from the terminal"
+}

tests/test1.in

@@ -213,9 +213,6 @@ echo 'echo "source argv {$argv}"' | source
 echo 'echo "source argv {$argv}"' | source -
 echo 'echo "source argv {$argv}"' | source - abc
 echo 'echo "source argv {$argv}"' | source - abc def
-# This hangs if it fails!
-source </dev/tty
-echo $status
 
 always_fails
 echo $status

tests/test1.out

@@ -140,4 +140,3 @@ source argv {}
 source argv {abc}
 source argv {abc def}
 1
-1