diff --git a/tests/local.mk b/tests/local.mk
index bba6ad9c9..2489baecf 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -92,6 +92,7 @@ nix_tests = \
   fmt.sh \
   eval-store.sh \
   why-depends.sh \
+  ca/why-depends.sh \
   import-derivation.sh \
   ca/import-derivation.sh \
   nix_path.sh \
diff --git a/tests/why-depends.sh b/tests/why-depends.sh
index c12941e76..a04d529b5 100644
--- a/tests/why-depends.sh
+++ b/tests/why-depends.sh
@@ -6,6 +6,9 @@ cp ./dependencies.nix ./dependencies.builder0.sh ./config.nix $TEST_HOME
 
 cd $TEST_HOME
 
+nix why-depends --derivation --file ./dependencies.nix input2_drv input1_drv
+nix why-depends --file ./dependencies.nix input2_drv input1_drv
+
 nix-build ./dependencies.nix -A input0_drv -o dep
 nix-build ./dependencies.nix -o toplevel