Practracker: add an integration test.

This test runs practracker with a set of 0 thresholds, to make sure
that it enumerates all its values right.  It tries running with an
empty exceptions file, and with an exceptions file that covers
_some_ of the data, and it makes sure that the outputs are as expected.

scripts/maint/practracker/test_practracker.sh

@@ -0,0 +1,50 @@
+#!/bin/sh
+
+umask 077
+
+TMPDIR=""
+clean () {
+  if [ -n "$TMPDIR" ] && [ -d "$TMPDIR" ]; then
+    rm -rf "$TMPDIR"
+  fi
+}
+trap clean EXIT HUP INT TERM
+
+if test "${PRACTRACKER_DIR}" = "" ||
+        test ! -e "${PRACTRACKER_DIR}/practracker.py" ; then
+    PRACTRACKER_DIR=$(dirname "$0")
+fi
+
+TMPDIR="$(mktemp -d -t pracktracker.test.XXXXXX)"
+if test -z "${TMPDIR}" || test ! -d "${TMPDIR}" ; then
+    echo >&2 "mktemp failed."
+    exit 1;
+fi
+
+DATA="${PRACTRACKER_DIR}/testdata"
+
+run_practracker() {
+    "${PYTHON:-python}" "${PRACTRACKER_DIR}/practracker.py" \
+        --max-include-count=0 --max-file-size=0 --max-function-size=0 --terse \
+        "${DATA}/" "$@";
+}
+
+echo "ex0:"
+
+run_practracker --exceptions "${DATA}/ex0.txt" > "${TMPDIR}/ex0-received.txt"
+
+if cmp "${TMPDIR}/ex0-received.txt" "${DATA}/ex0-expected.txt" ; then
+    echo "  OK"
+else
+    exit 1
+fi
+
+echo "ex1:"
+
+run_practracker --exceptions "${DATA}/ex1.txt" > "${TMPDIR}/ex1-received.txt"
+
+if cmp "${TMPDIR}/ex1-received.txt" "${DATA}/ex1-expected.txt" ;then
+    echo "  OK"
+else
+    exit 1
+fi