Add regression test for the previous commit

The issue was that https.cc never called URIStart(), one way to
detect this is that no download progress is generated without
this call. The test now checks for this and as a side-effect will
also ensure that we do not break download progress reporting and
Acquire::{http,https}::Dl-Limit accidently.

diff --git a/test/integration/test-apt-download-progress b/test/integration/test-apt-download-progress
new file mode 100755 (executable)
index 0000000..0a9020b
--- /dev/null
+++ b/test/integration/test-apt-download-progress
@@ -0,0 +1,43 @@
+#!/bin/sh
+#
+# ensure downloading sends progress as a regression test for commit 9127d7ae
+#
+set -e
+
+TESTDIR=$(readlink -f $(dirname $0))
+. $TESTDIR/framework
+
+setupenvironment
+changetohttpswebserver
+
+assertprogress() {
+    T="$1"
+    testsuccess grep "dlstatus:1:0:Retrieving file 1 of 1" "$T"
+    if ! egrep -q "dlstatus:1:[0-9]{1,2}\.(.*):Retrieving file 1 of 1" "$T"; then
+        cat "$T"
+        msgfail "Failed to detect download progress"
+    fi
+    testsuccess grep "dlstatus:1:100:Retrieving file 1 of 1" "$T"
+    #cat $T
+}
+
+# we need to ensure the file is reasonable big so that apt has a chance to
+# actually report progress - but not too big to ensure its not delaying the
+# test too much
+TESTFILE=testfile.big
+testsuccess dd if=/dev/zero of=./aptarchive/$TESTFILE bs=800k count=1 
+
+msgtest 'download progress works via' 'http'
+printf '\n'
+exec 3> apt-progress.log
+testsuccess apthelper download-file "http://localhost:8080/$TESTFILE" http-$TESTFILE -o APT::Status-Fd=3 -o Acquire::http::Dl-Limit=800
+assertprogress apt-progress.log
+
+msgtest 'download progress works via' 'https'
+printf '\n'
+exec 3> apt-progress.log
+testsuccess apthelper download-file "https://localhost:4433/$TESTFILE" https-$TESTFILE -o APT::Status-Fd=3 -o Acquire::https::Dl-Limit=800
+assertprogress apt-progress.log
+
+# cleanup
+rm -f apt-progress*.log