diff --git a/tests/Display_-_--bits.sh b/tests/Display_-_--bits.sh
new file mode 100644
index 0000000..b7db80f
--- /dev/null
+++ b/tests/Display_-_--bits.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+#
+# Check that the byte counter counts in bits when --bits is selected.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"
+
+dd if=/dev/zero bs=100 count=1 2>/dev/null \
+| "${testSubject}" -f -b -8 >/dev/null 2>"${workFile1}"
+
+counterValue=$(tr '\r' '\n' < "${workFile1}" | tr -d ' ')
+test "${counterValue}" = "800b" && exit 0
+
+echo "unexpected bit counter value: ${counterValue}"
+exit 1
+
+# EOF
diff --git a/tests/Display_-_--buffer-percent.sh b/tests/Display_-_--buffer-percent.sh
new file mode 100644
index 0000000..819d708
--- /dev/null
+++ b/tests/Display_-_--buffer-percent.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# Check that "--buffer-percent" displays correctly.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"
+
+# The output should show 100% and 0% as the buffer initially fills up due to
+# there being nowhere to write it to, and then empties.
+( dd if=/dev/zero bs=1024 count=1024; sleep 2; ) 2>/dev/null \
+| "${testSubject}" -f -T -i 0.5 -B 1024 2>"${workFile1}" \
+| (sleep 1; dd bs=1024 count=512; sleep 1; cat; ) >/dev/null 2>&1
+
+differentLines=$(tr '\r' '\n' < "${workFile1}" | sed '/^ *$/d' | sort | uniq | wc -l | tr -dc '0-9')
+test "${differentLines}" -gt 1 && exit 0
+
+echo "expected output changes not seen"
+tr '\r' '\n' < "${workFile1}" | sed 's/^ *$/d' | sort | uniq
+exit 1
+
+# EOF
diff --git a/tests/Display_-_--last-written.sh b/tests/Display_-_--last-written.sh
new file mode 100644
index 0000000..3a97daf
--- /dev/null
+++ b/tests/Display_-_--last-written.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+#
+# Check that "--last-written" works.
+
+# Dummy assignments for "shellcheck".
+testSubject="${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
diff --git a/tests/Display_-_--numeric_--bytes_--line-mode.sh b/tests/Display_-_--numeric_--bytes_--line-mode.sh
new file mode 100644
index 0000000..283f2ba
--- /dev/null
+++ b/tests/Display_-_--numeric_--bytes_--line-mode.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+#
+# Check that numeric output shows line counts instead of percentages, when
+# used in line mode together with bytes mode.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"; workFile2="${workFile2:-.tmp2}"
+
+# Pass through 100 lines.
+#
+seq -w 3 1 100 \
+| "${testSubject}" -bnl -i 0.2 -f -L 100 2>"${workFile1}" > "${workFile2}"
+
+lineCount=$(wc -l < "${workFile1}" | tr -dc '0-9')
+finalStdoutLine=$(sed -n '$p' < "${workFile2}")
+
+# The number of output lines should be >3 and <10, and the final line of
+# transferred data on stdout should be 100.
+#
+if ! test "${lineCount}" -gt 3; then
+	echo "fewer than 4 output lines (${lineCount})"
+	cat "${workFile1}"
+	exit 1
+fi
+if ! test "${lineCount}" -lt 10; then
+	echo "more than 9 output lines (${lineCount})"
+	cat "${workFile1}"
+	exit 1
+fi
+if ! test "${finalStdoutLine}" = "100"; then
+	echo "final transferred line was not 100 (${finalStdoutLine})"
+	exit 1
+fi
+
+exit 0
+
+# EOF