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

tests/Display_-_--last-written.test

@@ -0,0 +1,34 @@
+#!/bin/sh
+#
+# Check that "--last-written" works.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"
+
+# Slowly write a sequence of numbers (rate-limited by another `pv' instance)
+# and watch the "--last-written" output of a second `pv' instance to make
+# sure the buffer contents are visible (we use "-B" to disable splice mode).
+seq -w 3 1 100 \
+| "${testSubject}" -qL 200 \
+| "${testSubject}" -f -B 1024 -A 16 -i 0.2 >/dev/null 2>"${workFile1}"
+
+differentLines=$(tr '\r' '\n' < "${workFile1}" | sed '/^ *$/d' | sort | uniq | wc -l | tr -dc '0-9')
+lastLine=$(tr '\r' '\n' < "${workFile1}" | sed '/^ *$/d' | sed -n '$p')
+
+if ! test "${differentLines}" -gt 5; then
+	echo "fewer than 6 different outputs seen"
+	tr '\r' '\n' < "${workFile1}" | sed '/^ *$/d' | sort | uniq
+	exit 1
+fi
+
+expectedLastLine="097.098.099.100."
+if ! test "${lastLine}" = "${expectedLastLine}"; then
+	echo "final output differs from expected value"
+	echo "expected value: [${expectedLastLine}]"
+	echo "observed value: [${lastLine}]"
+	exit 1
+fi
+
+exit 0
+
+# EOF