patch: test that scanning file "-" reads from stdin

[Stephen Gildea]

The enclosed patch improves the test coverage of "scan",
enhancing the test I wrote last year.

 < Stephen


commit 23d5c90f38d573f3e88d08e09489ada3f731ef7a
Author: Stephen Gildea <stepheng+...@gildea.com>
Date:   Thu Feb 18 18:57:12 2021 -0800

    test-scan-file: test that scanning file "-" reads from stdin

diff --git a/test/scan/test-scan-file b/test/scan/test-scan-file
index daf3f3fb..8a53f56f 100755
--- a/test/scan/test-scan-file
+++ b/test/scan/test-scan-file
@@ -46,6 +46,13 @@ start_test 'scan file'
 run_prog scan -file "$MH_TEST_DIR/spoolfile" -width 80 >"$actual" || exit 1
 check "$expected" "$actual" 'keep first'
 
+## Test that scanning file "-" reads from stdin
+
+start_test 'scan file stdin'
+
+run_prog scan -file - <"$MH_TEST_DIR/spoolfile" -width 80 >"$actual" || exit 1
+check "$expected" "$actual" 'keep first'
+
 test -z "$MH_TEST_NOCLEANUP" && rm -f "$MH_TEST_DIR/spoolfile"
 
 ## Convert the test inbox folder into a Maildir directory