Test the basic block layer error injection functionality.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 tests/block/044     | 71 +++++++++++++++++++++++++++++++++++++++++++++
 tests/block/044.out |  9 ++++++
 2 files changed, 80 insertions(+)
 create mode 100755 tests/block/044
 create mode 100644 tests/block/044.out

diff --git a/tests/block/044 b/tests/block/044
new file mode 100755
index 000000000000..8baf9fa59c68
--- /dev/null
+++ b/tests/block/044
@@ -0,0 +1,71 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Christoph Hellwig.
+#
+# Basic block error injection test.
+
+. tests/block/rc
+. common/scsi_debug
+
+DESCRIPTION="basic block error injection test"
+QUICK=1
+
+requires()
+{	
+	_have_loadable_scsi_debug
+	_have_program xfs_io
+}
+
+# load and remove scsi_debug once to test the static_key bug in the
+# initial commit
+_test_load_unload()
+{
+	if ! _init_scsi_debug dev_size_mb=500; then
+		return 1
+	fi
+
+	local dev=${SCSI_DEBUG_DEVICES[0]}
+	local debugfs_file="/sys/kernel/debug/block/$dev/error_injection"
+	if [[ ! -f "${debugfs_file}" ]]; then
+		SKIP_REASONS+=("error injection not supported")
+		_exit_scsi_debug
+		return 1
+	fi
+	echo "Testing unload without rules"
+	_exit_scsi_debug
+}
+
+_test_rules()
+{
+	if ! _init_scsi_debug dev_size_mb=500; then
+		return 1
+	fi
+
+	local dev=${SCSI_DEBUG_DEVICES[0]}
+	local debugfs_file="/sys/kernel/debug/block/$dev/error_injection"
+
+	echo "Testing valid rules"
+	echo "add,op=WRITE,status=RESOURCE,start=0,nr_sectors=8" > $debugfs_file
+	echo "add,op=READ,status=IOERR,start=16,nr_sectors=8" > $debugfs_file
+	xfs_io -d -c 'pwrite -q 0 4096' /dev/$dev
+	xfs_io -d -c 'pread -q 0 4096' /dev/$dev
+	xfs_io -d -c 'pwrite -q 4096 4096' /dev/$dev
+	xfs_io -d -c 'pread -q 8192 8192' /dev/$dev
+
+	echo "Testing invalid rules"
+	echo "op=READ,status=IOERR" > $debugfs_file
+	echo "add,op=READ,status=EIO,start=32" > $debugfs_file
+	_exit_scsi_debug
+}
+
+test()
+{
+	echo "Running ${TEST_NAME}"
+
+	local ret
+
+	_test_load_unload
+	_test_rules
+
+	echo "Test complete"
+}
diff --git a/tests/block/044.out b/tests/block/044.out
new file mode 100644
index 000000000000..92efcddf7c8e
--- /dev/null
+++ b/tests/block/044.out
@@ -0,0 +1,9 @@
+Running block/044
+Testing unload without rules
+Testing valid rules
+pwrite: Cannot allocate memory
+pread: Input/output error
+Testing invalid rules
+tests/block/044: line 56: echo: write error: Invalid argument
+tests/block/044: line 57: echo: write error: Invalid argument
+Test complete
-- 
2.53.0