Major restructuring to switch build system from old scripts to GNU Automake.

tests/Display_-_--average-rate.test

@@ -0,0 +1,31 @@
+#!/bin/sh
+#
+# Check that the average transfer rate counter changes, but not more than it
+# should.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"
+
+# Transfer 210 bytes as 100 bytes, a 1 second gap, 110 bytes, and another 1
+# second gap.
+#
+(dd if=/dev/zero bs=100 count=1 2>/dev/null;
+ sleep 1;
+ dd if=/dev/zero bs=110 count=1 2>/dev/null;
+ sleep 1;
+) | "${testSubject}" -f -i 0.5 -a >/dev/null 2>"${workFile1}"
+
+# Count the number of rates output that are below 80.
+#
+lineCount=$(tr '\r' '\n' < "${workFile1}" | tr -dc '0-9.\n' | sed '/^$/d' | awk '$1<80{print}' | wc -l | tr -dc '0-9')
+
+# Nearly all of the output rates should be above 80 since the average rate
+# will always be around 100 bytes per second, except for pauses.
+#
+test "${lineCount}" -lt 2 && exit 0
+
+echo "average rate varied more than expected"
+tr '\r' '\n' < "${workFile1}"
+exit 1
+
+# EOF