diff --git a/include/test/ni845x.h b/include/test/ni845x.h
new file mode 100644
index 0000000..cd6a56b
--- /dev/null
+++ b/include/test/ni845x.h
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2026 Nico Huber <nico.h@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * This file is merely mimicking the expected API, so we
+ * can build test the ni845x_spi driver. Everything in
+ * here is derived from the usage in `ni845x_spi.c`.
+ */
+
+#ifndef __NI845X_H__
+#define __NI845X_H__ 1
+
+#include <stdint.h>
+
+typedef uint8_t		uInt8;
+typedef uint16_t	uInt16;
+typedef uint32_t	uInt32;
+typedef int32_t		int32;
+typedef uInt32		NiHandle;
+
+enum {
+	kNi845x12Volts,
+	kNi845x15Volts,
+	kNi845x18Volts,
+	kNi845x25Volts,
+	kNi845x33Volts,
+};
+
+void ni845xStatusToString(int32 err, uInt32 buf_size, char *buf);
+
+int32 ni845xFindDevice(char *resource_name, NiHandle *, uInt32 *found_devices_count);
+int32 ni845xFindDeviceNext(NiHandle, char *resource_name);
+int32 ni845xCloseFindDeviceHandle(NiHandle);
+
+int32 ni845xOpen(char *resource_name, uInt32 *opened_handle);
+int32 ni845xSetIoVoltageLevel(uInt32 device_handle, uInt8 selected_voltage_100mV);
+int32 ni845xClose(uInt32 device_handle);
+
+int32 ni845xSpiConfigurationOpen(NiHandle *);
+int32 ni845xSpiConfigurationSetClockRate(NiHandle, uInt16 SCK_freq_in_KHz);
+int32 ni845xSpiConfigurationGetClockRate(NiHandle, uInt16 *clock_freq_read_KHz);
+int32 ni845xSpiWriteRead(uInt32 device_handle, NiHandle, uInt32 write_size, const uInt8 *write_buf, uInt32 *read_size, uInt8 *read_buf);
+int32 ni845xSpiConfigurationClose(NiHandle);
+
+#endif				/* !__NI845X_H__ */