Add more tests

tests/Display_-_--progress_-_increasing.sh

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+#!/bin/sh
+#
+# Check that the progress bar increases in size when data is coming in.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"
+
+dd if=/dev/zero bs=100 count=1 2>/dev/null \
+| "${testSubject}" -f -p -i 0.1 -L 50 -s 100 >/dev/null 2>"${workFile1}"
+
+# There should be more than 5 different lines of output.
+#
+lineCount=$(tr '\r' '\n' < "${workFile1}" | sort | uniq -u | wc -l | tr -dc '0-9')
+if ! test "${lineCount}" -gt 5; then
+	echo "fewer than 6 different progress lines (${lineCount})"
+	tr '\r' '\n' < "${workFile1}" | sort | uniq -u
+	exit 1
+fi
+
+# Counting the "=" characters in each line that make up the progress bar
+# should give at least 5 different line lengths.
+#
+differentBarLengthsCount=$(tr '\r' '\n' < "${workFile1}" | tr -dc '=\n' | awk '{print length($1)}' | sort | uniq -u | wc -l | tr -dc '0-9')
+if ! test "${differentBarLengthsCount}" -gt 5; then
+	echo "fewer than 6 different progress bar lengths detected (${differentBarLengthsCount})"
+	tr '\r' '\n' < "${workFile1}" | sort | uniq -u
+	exit 1
+fi
+
+exit 0
+
+# EOF

tests/General_-_--pidfile.sh

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+#!/bin/sh
+#
+# Check that process ID can be written to a file as described in the manual.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"
+
+# Check we can run "kill -s 0".
+if ! kill -s 0 $$ >/dev/null 2>&1; then
+	echo "cannot check process existence with \`kill -s 0'"
+	exit 2
+fi
+
+dd if=/dev/zero bs=150 count=1 2>/dev/null \
+| "${testSubject}" -q -L 50 -P "${workFile1}" >/dev/null 2>/dev/null \
+&
+
+testPid="$!"
+sleep 1
+
+storedPid=$(cat "${workFile1}" 2>/dev/null)
+
+pidValid="0"
+kill -s 0 "${storedPid}" 2>/dev/null && pidValid="1"
+
+wait
+
+sleep 1
+
+if test -s "${workFile1}"; then
+	echo "PID file was not removed on exit"
+	exit 1
+fi
+
+true > "${workFile1}"
+
+if ! test "${testPid}" = "${storedPid}"; then
+	echo "stored PID [${storedPid}] did not match actual PID [${testPid}]"
+	exit 1
+fi
+
+if ! test "${pidValid}" = "1"; then
+	echo "stored PID [${storedPid}] was not reachable"
+	exit 1
+fi
+
+exit 0
+
+# EOF

tests/Modifiers_-_--force.sh

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+#!/bin/sh
+#
+# Check that the progress bar is produced when "--force" is used, and is not
+# when it is not, providing stderr is a file.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}";
+
+dd if=/dev/zero bs=100 count=1 2>/dev/null \
+| "${testSubject}" -f -p -i 0.1 -L 100 >/dev/null 2>"${workFile1}"
+
+# There should be more than 2 different lines of output.
+#
+lineCount=$(tr '\r' '\n' < "${workFile1}" | sort | uniq -u | wc -l | tr -dc '0-9')
+if ! test "${lineCount}" -gt 2; then
+	echo "fewer than 3 different progress lines with \"--force\" (${lineCount})"
+	tr '\r' '\n' < "${workFile1}" | sort | uniq -u
+	exit 1
+fi
+
+# Now try again without "--force".
+
+dd if=/dev/zero bs=100 count=1 2>/dev/null \
+| "${testSubject}" -p -i 0.1 -L 100 >/dev/null 2>"${workFile1}"
+
+# There should be no output without "--force".
+#
+if test -s "${workFile1}"; then
+	echo "unexpected output when not using \"--force\""
+	tr '\r' '\n' < "${workFile1}" | sort | uniq -u
+	exit 1
+fi
+
+exit 0
+
+# EOF