diff --git a/nixos/tests.nix b/nixos/tests.nix
new file mode 100644
index 0000000000000000000000000000000000000000..f424434d5fbde88b90588b25ecef9ef851d453bf
--- /dev/null
+++ b/nixos/tests.nix
@@ -0,0 +1,35 @@
+# The overall test suite for PrivateStorageio NixOS configuration.
+let
+  pkgs = import <nixpkgs> { };
+
+  # A helper for loading tests.
+  loadTest = moduleUnderTest: testModule:
+    (import testModule (pkgs.callPackage moduleUnderTest { }));
+
+  # A list of tests to run.  Manually updated for now, alas.  Only tests in
+  # this list will be run!
+  testModules =
+  [ (loadTest ./lib/ini.nix ./lib/tests/test_ini.nix)
+  ];
+
+  # Run the tests and collect the failures.
+  failures = map pkgs.lib.runTests testModules;
+
+  # Count the number of failures in each module.
+  numFailures = builtins.foldl' (a: b: a + b) 0 (map builtins.length failures);
+
+  # Convert the total into a string for easy interpolation into the shell script.
+  numFailuresStr = builtins.toString (numFailures);
+
+  # Convert the failure information to a string for reporting.
+  failuresStr = builtins.toJSON failures;
+in
+pkgs.runCommand "test-results" {} ''
+if [ ${numFailuresStr} -gt 0 ]; then
+  echo "Failed ${numFailuresStr} tests"
+  echo '${failuresStr}'
+  exit 1
+else
+  echo 'OK' > $out
+fi
+''