diff --git a/tests/dependencies.nix b/tests/dependencies.nix
index e320d81c9..45aca1793 100644
--- a/tests/dependencies.nix
+++ b/tests/dependencies.nix
@@ -27,6 +27,8 @@ let {
     input1 = input1 + "/.";
     input2 = "${input2}/.";
     input1_drv = input1;
+    input2_drv = input2;
+    input0_drv = input0;
     meta.description = "Random test package";
   };
 
diff --git a/tests/local.mk b/tests/local.mk
index 8580ecac9..93cf20d43 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -61,7 +61,8 @@ nix_tests = \
   ca/concurrent-builds.sh \
   ca/nix-copy.sh \
   eval-store.sh \
-  readfile-context.sh
+  readfile-context.sh \
+  why-depends.sh
   # parallel.sh
 
 ifeq ($(HAVE_LIBCPUID), 1)
diff --git a/tests/why-depends.sh b/tests/why-depends.sh
new file mode 100644
index 000000000..11b54b5b6
--- /dev/null
+++ b/tests/why-depends.sh
@@ -0,0 +1,13 @@
+source common.sh
+
+clearStore
+
+cp ./dependencies.nix ./dependencies.builder0.sh ./config.nix $TEST_HOME
+
+cd $TEST_HOME
+
+nix-build ./dependencies.nix -A input0_drv -o dep
+nix-build ./dependencies.nix -o toplevel
+
+nix why-depends ./toplevel ./dep |
+    grep input-2