1 files changed, 73 insertions, 0 deletions
diff --git a/tests/misc/shuf-reservoir.sh b/tests/misc/shuf-reservoir.sh
new file mode 100755
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+++ b/tests/misc/shuf-reservoir.sh
@@ -0,0 +1,73 @@
+#!/bin/sh
+# Exercise shuf's reservoir-sampling code
+# NOTE:
+#  These tests do not check valid randomness,
+#  they just check memory allocation related code.
+
+# Copyright (C) 2013-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ shuf
+expensive_
+require_valgrind_
+
+# Only exit with error for leaks when in development mode
+# in which case we enable code to suppress inconsequential leaks.
+grep '^#define lint 1' "$CONFIG_HEADER" && leaklevel=full || leaklevel=summary
+
+# Run "shuf" with specific number of input lines and output lines
+# Check the output for expected number of lines.
+run_shuf_n()
+{
+  INPUT_LINES="$1"
+  OUTPUT_LINES="$2"
+
+  # Critical memory-related bugs will cause a segfault here
+  # (with varying numbers of input/output lines)
+  seq "$INPUT_LINES" | valgrind --leak-check=$leaklevel --error-exitcode=1 \
+  shuf -n "$OUTPUT_LINES" -o "out_${INPUT_LINES}_${OUTPUT_LINES}" || return 1
+
+  EXPECTED_LINES="$OUTPUT_LINES"
+  test "$INPUT_LINES" -lt "$OUTPUT_LINES" && EXPECTED_LINES="$INPUT_LINES"
+
+  # There is no sure way to verify shuffled output (as it is random).
+  # Ensure we have the correct number of all numeric lines non duplicated lines.
+  GOOD_LINES=$(grep '^[0-9][0-9]*$' "out_${INPUT_LINES}_${OUTPUT_LINES}" |
+               sort -un | wc -l) || framework_failure_
+  LINES=$(wc -l < "out_${INPUT_LINES}_${OUTPUT_LINES}") || framework_failure_
+
+  test "$EXPECTED_LINES" -eq "$GOOD_LINES" || return 1
+  test "$EXPECTED_LINES" -eq "$LINES" || return 1
+
+  return 0
+}
+
+# Test multiple combinations of input lines and output lines.
+# (e.g. small number of input lines and large number of output lines,
+#  and vice-versa. Also, each reservoir allocation uses a 1024-lines batch,
+#  so test 1023/1024/1025 and related values).
+TEST_LINES="0 1 5 1023 1024 1025 3071 3072 3073"
+
+for IN_N in $TEST_LINES; do
+  for OUT_N in $TEST_LINES; do
+    run_shuf_n "$IN_N" "$OUT_N" || {
+      fail=1
+      echo "shuf-reservoir-sampling failed with IN_N=$IN_N OUT_N=$OUT_N" >&2;
+    }
+  done
+done
+
+Exit $fail