mention the os-prober test in pkgs.os-prober.passthru.tests

nixos/tests/all-tests.nix

@@ -183,6 +183,7 @@ in
   # openstack-image-userdata doesn't work in a sandbox as the simulated openstack instance needs network access
   #openstack-image-userdata = (handleTestOn ["x86_64-linux"] ./openstack-image.nix {}).userdata or {};
   openstack-image-metadata = (handleTestOn ["x86_64-linux"] ./openstack-image.nix {}).metadata or {};
+  os-prober = handleTestOn ["x86_64-linux"] ./os-prober.nix {};
   osquery = handleTest ./osquery.nix {};
   osrm-backend = handleTest ./osrm-backend.nix {};
   ostree = handleTest ./ostree.nix {};

nixos/tests/os-prober.nix

@@ -1,4 +1,4 @@
-import ./make-test.nix ({pkgs, lib}:
+import ./make-test.nix ({pkgs, lib, ...}:
 let
   # A filesystem image with a (presumably) bootable debian
   debianImage = pkgs.vmTools.diskImageFuns.debian9i386 {

pkgs/tools/misc/os-prober/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitLab, makeWrapper,
+{ stdenv, fetchFromGitLab, makeWrapper, nixosTests,
 # optional dependencies, the command(s) they provide
 coreutils,  # mktemp
 grub2,      # grub-mount and grub-probe
@@ -59,6 +59,9 @@ stdenv.mkDerivation rec {
     done;
   '';
 
+  passthru.tests = {
+    os-prober = nixosTests.os-prober;
+  };
   meta = with stdenv.lib; {
     description = "Utility to detect other OSs on a set of drives";
     homepage = http://packages.debian.org/source/sid/os-prober;