From 1d28da18cec51a6f6a0946c6347b4c406b78392d Mon Sep 17 00:00:00 2001
From: Andrew Wood <andrew.wood@ivarch.com>
Date: Sun, 19 Apr 2026 23:12:10 +0100
Subject: [PATCH] Add a basic test for monitoring, each of the "in" and "out"
 sides.

---
 Makefile.am                |  1 +
 tests/Monitor_-_Basic.test | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100755 tests/Monitor_-_Basic.test

diff --git a/Makefile.am b/Makefile.am
index 486b230..3a873e9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -97,6 +97,7 @@ tests/Modifiers_-_--size_from_file_size.test \
 tests/Modifiers_-_--size_from_dir_size.test \
 tests/Modifiers_-_--size.test \
 tests/Modifiers_-_--sync.test \
+tests/Monitor_-_Basic.test \
 tests/Sparse_-_Basic.test \
 tests/Terminal_-_Detect_width.test \
 tests/Transfer_-_--rate-limit.test \
diff --git a/tests/Monitor_-_Basic.test b/tests/Monitor_-_Basic.test
new file mode 100755
index 0000000..8a26eec
--- /dev/null
+++ b/tests/Monitor_-_Basic.test
@@ -0,0 +1,27 @@
+#!/bin/sh
+#
+# Check that monitoring of a simple command works.
+
+# Allow all tests to be skipped, e.g. during a release build
+test "${SKIP_ALL_TESTS}" = "1" && exit 77
+
+true "${testSubject:?not set - call this from 'make check'}"
+true "${workFile1:?not set - call this from 'make check'}"
+
+seq 1 100 | "${testSubject}" -M in -f -l -b -- sed '1~2d' >/dev/null 2>"${workFile1}"
+
+counterValue=$(tr '\r' '\n' < "${workFile1}" | awk '/[0-9]/{print int($1)}' | sed -n '$p')
+if ! test "${counterValue}" = "100"; then
+	echo "in monitor: unexpected byte counter value: ${counterValue}"
+	exit 1
+fi
+
+seq 1 100 | "${testSubject}" -M out -f -l -b -- sed '1~2d' >/dev/null 2>"${workFile1}"
+
+counterValue=$(tr '\r' '\n' < "${workFile1}" | awk '/[0-9]/{print int($1)}' | sed -n '$p')
+if ! test "${counterValue}" = "50"; then
+	echo "out monitor: unexpected byte counter value: ${counterValue}"
+	exit 1
+fi
+
+exit 0