nixosTests.nixos-test-driver.node-name: init

nixos/tests/all-tests.nix

@@ -70,6 +70,7 @@ in {
   # Testing the test driver
   nixos-test-driver = {
     extra-python-packages = handleTest ./nixos-test-driver/extra-python-packages.nix {};
+    node-name = runTest ./nixos-test-driver/node-name.nix;
   };
 
   # NixOS vm tests and non-vm unit tests

nixos/tests/nixos-test-driver/node-name.nix

@@ -0,0 +1,33 @@
+{
+  name = "nixos-test-driver.node-name";
+  nodes = {
+    "ok" = { };
+
+    # Valid node name, but not a great host name.
+    "one_two" = { };
+
+    # Valid node name, good host name
+    "a-b" = { };
+
+    # TODO: would be nice to test these eval failures
+    # Not allowed by lib/testing/network.nix (yet?)
+    # "foo.bar" = { };
+    # Not allowed.
+    # "not ok" = { }; # not ok
+  };
+
+  testScript = ''
+    start_all()
+
+    with subtest("python vars exist and machines are reachable through test backdoor"):
+      ok.succeed("true")
+      one_two.succeed("true")
+      a_b.succeed("true")
+
+    with subtest("hostname is derived from the node name"):
+      ok.succeed("hostname | tee /dev/stderr | grep '^ok$'")
+      one_two.succeed("hostname | tee /dev/stderr | grep '^onetwo$'")
+      a_b.succeed("hostname | tee /dev/stderr | grep '^a-b$'")
+
+  '';
+}