nl: ensure '-b n' option displays file content

The command 'nl -b n' should output no line numbers, just some
spaces as a placeholder followed by the actual file content.

Add tests for line numbering by cat and nl.  The correct results
were obtained from coreutils.

function                                             old     new   delta
print_numbered_lines                                 152     157      +5
.rodata                                           182456  182453      -3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 5/-3)                Total: 2 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 63 insertions, 0 deletions

diff --git a/testsuite/cat.tests b/testsuite/cat.tests
index 10970dc90..cf924ab5b 100755
--- a/testsuite/cat.tests
+++ b/testsuite/cat.tests
@@ -22,4 +22,28 @@ testing 'cat -v' \
         'foo\n'
 SKIP=
 
+optional FEATURE_CATN
+testing 'cat -n' \
+        'cat -n' \
+"\
+     1  line 1
+     2  
+     3  line 3
+" \
+        '' \
+        'line 1\n\nline 3\n'
+SKIP=
+
+optional FEATURE_CATN
+testing 'cat -b' \
+        'cat -b' \
+"\
+     1  line 1
+
+     2  line 3
+" \
+        '' \
+        'line 1\n\nline 3\n'
+SKIP=
+
 exit $FAILCOUNT
diff --git a/testsuite/nl.tests b/testsuite/nl.tests
new file mode 100755
index 000000000..95e7abb58
--- /dev/null
+++ b/testsuite/nl.tests
@@ -0,0 +1,39 @@
+#!/bin/sh
+# Copyright 2021 by Ron Yorston
+# Licensed under GPLv2, see file LICENSE in this source tree.
+
+. ./testing.sh
+
+# testing "test name" "commands" "expected result" "file input" "stdin"
+
+testing "nl numbers all lines" \
+        "nl -b a input" \
+"\
+     1  line 1
+     2  
+     3  line 3
+" \
+        "line 1\n\nline 3\n" \
+        ""
+
+testing "nl numbers non-empty lines" \
+        "nl -b t input" \
+"\
+     1  line 1
+       
+     2  line 3
+" \
+        "line 1\n\nline 3\n" \
+        ""
+
+testing "nl numbers no lines" \
+        "nl -b n input" \
+"\
+       line 1
+       
+       line 3
+" \
+        "line 1\n\nline 3\n" \
+        ""
+
+exit $FAILCOUNT