diff --git a/t/deps/broken.do b/t/deps/broken.do
new file mode 100644
index 0000000..c508d53
--- /dev/null
+++ b/t/deps/broken.do
@@ -0,0 +1 @@
+false
diff --git a/t/deps/ifchange-fail.do b/t/deps/ifchange-fail.do
new file mode 100644
index 0000000..82da2c0
--- /dev/null
+++ b/t/deps/ifchange-fail.do
@@ -0,0 +1,4 @@
+if redo-ifchange broken 2>/dev/null; then
+	echo "expected broken.do to fail, but it didn't" >&2
+	exit 44
+fi
diff --git a/t/deps/test.do b/t/deps/test.do
index 17d436e..e0df597 100644
--- a/t/deps/test.do
+++ b/t/deps/test.do
@@ -1,2 +1,3 @@
-redo test1 test2
+redo test1 test2 ifchange-fail
+