Basic tests for sort. Needs more...

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+#!/bin/bash
+
+# SUSv3 compliant sort tests.
+# Copyright 2005 by Rob Landley <rob@landley.net>
+# Licensed under GPL v2, see file LICENSE for details.
+
+. testing.sh
+
+# The basic tests.  These should work even with the small config.
+
+testing "sort" "sort input" "a\nb\nc\n" "c\na\nb\n" ""
+testing "sort #2" "sort input" "010\n1\n3\n" "3\n1\n010\n" ""
+testing "sort stdin" "sort" "a\nb\nc\n" "" "b\na\nc\n"
+testing "sort numeric" "sort -n input" "1\n3\n010\n" "3\n1\n010\n" ""
+testing "sort reverse" "sort -r input" "wook\nwalrus\npoint\npabst\naargh\n" \
+	"point\nwook\npabst\naargh\nwalrus\n" ""
+
+# These tests require the full option set.
+
+optional SORT_BIG
+# Longish chunk of data re-used by the next few tests.  The expected output
+# varies, but the input (this) is the same.
+
+data="42	1	3	woot
+42	1	010	zoology
+egg	1	2	papyrus
+7	3	42	soup
+999	3	0	algebra
+"
+
+# Sorting with keys
+
+testing "sort one key" "sort -k4,4 input" \
+"999	3	0	algebra
+egg	1	2	papyrus
+7	3	42	soup
+42	1	3	woot
+42	1	010	zoology
+" "$data" ""
+
+# The numeric sort orders field 2, ignores field 3 (because numeric sort stops
+# at the whitespace), then the global fallback sort does an alpha sort on
+# the whole string (starting at the beginning of the line).
+
+testing "sort key range with numeric option" "sort -k2,3n input" \
+"42	1	010	zoology
+42	1	3	woot
+egg	1	2	papyrus
+7	3	42	soup
+999	3	0	algebra
+" "$data" ""
+
+# Numeric sort on field 2 (again, ignore field 3 because it's numeric),
+# then do a _reversed_ alpha sort on the whole line as a tiebreaker.
+
+testing "sort key range with numeric option and global reverse" \
+"sort -k2,3n -r input" \
+"egg	1	2	papyrus
+42	1	3	woot
+42	1	010	zoology
+999	3	0	algebra
+7	3	42	soup
+" "$data" ""
+
+# Reversed numeric sort on field 2 (numeric ignores field 3), then
+# break ties with alpha sort on whole line.
+
+testing "sort key range with multiple options" "sort -k2,3rn input" \
+"7	3	42	soup
+999	3	0	algebra
+42	1	010	zoology
+42	1	3	woot
+egg	1	2	papyrus
+" "$data" ""
+
+testing "sort key doesn't strip leading blanks, disables fallback global sort" \
+"sort -n -k2 -t ' '" " a \n 1 \n 2 \n" "" " 2 \n 1 \n a \n"
+
+# Test case contributed by Joey Hess:
+
+testing "sort key edge case with -t" "sort -n -k4 -t/" \
+"/usr/lib/finish-install.d/1
+/usr/lib/finish-install.d/4
+/usr/lib/prebaseconfig.d/2
+/usr/lib/prebaseconfig.d/6
+" "" "/usr/lib/finish-install.d/1
+/usr/lib/prebaseconfig.d/2
+/usr/lib/finish-install.d/4
+/usr/lib/prebaseconfig.d/6
+"
+
+exit $FAILCOUNT