Add test/include.mk
diff --git a/test/include.mk b/test/include.mk
new file mode 100644
index 0000000..9ac8f5b
--- /dev/null
+++ b/test/include.mk
@@ -0,0 +1,9 @@
+test1:
+	echo "foo: bar" > foo.d
+
+test2: foo
+
+bar:
+	echo OK
+
+-include foo.d missing.d