diff --git a/Makefile b/Makefile
index c7f3840..194d9e5 100644
--- a/Makefile
+++ b/Makefile
@@ -55,6 +55,7 @@ test: clean
 	$(MAKE) -f copyfile.mk
 	$(MAKE) -f dir.mk
 	$(MAKE) -f fexist.mk
+	$(MAKE) -f fisdir.mk
 	$(MAKE) -f fsendfile.mk
 	$(MAKE) -f makepath.mk
 	$(MAKE) -f pidfilefn.mk
diff --git a/fisdir.c b/fisdir.c
index 2eeb98b..3b3eb95 100644
--- a/fisdir.c
+++ b/fisdir.c
@@ -42,8 +42,37 @@ int fisdir(char *file)
 	return 0;
 }
 
+#ifdef UNITTEST
+#include "lite.h"
+
+int main(void)
+{
+	int i = 0;
+	struct { char *file; int exist; } arr[] = {
+		{ "/etc/passwd", 0 },
+		{ "/etc/",       1 },
+		{ "/sbin/init",  0 },
+		{ "/dev/null",   0 },
+		{ "/dev/",       1 },
+		{ NULL,  0 },
+	};
+	FILE *src, *dst;
+
+	for (i = 0; i < NELEMS(arr); i++) {
+		if (fisdir(arr[i].file) != arr[i].exist)
+			err(1, "Failed fisdir(%s)", arr[i].file ?: "NULL");
+		else
+			printf("fisdir() %-11s %-18s => OK!\n", arr[i].file ?: "NULL",
+			       arr[i].exist ? "is a directory" : "is NOT a directory");
+	}
+
+	return 0;
+}
+#endif /* UNITTEST */
+
 /**
  * Local Variables:
+ *  compile-command: "make V=1 -f fisdir.mk"
  *  version-control: t
  *  indent-tabs-mode: t
  *  c-file-style: "linux"
diff --git a/fisdir.mk b/fisdir.mk
new file mode 100644
index 0000000..32d486d
--- /dev/null
+++ b/fisdir.mk
@@ -0,0 +1,4 @@
+OBJS        = 
+TARGET      = fisdir.test clean
+
+include rules.mk