vscode/vscodium: Add integration test

nixos/tests/all-tests.nix

@@ -413,6 +413,7 @@ in
   vector = handleTest ./vector.nix {};
   victoriametrics = handleTest ./victoriametrics.nix {};
   virtualbox = handleTestOn ["x86_64-linux"] ./virtualbox.nix {};
+  vscodium = handleTest ./vscodium.nix {};
   wasabibackend = handleTest ./wasabibackend.nix {};
   wireguard = handleTest ./wireguard {};
   wordpress = handleTest ./wordpress.nix {};

nixos/tests/vscodium.nix

@@ -0,0 +1,62 @@
+import ./make-test-python.nix ({ pkgs, ...} :
+
+{
+  name = "vscodium";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ turion ];
+  };
+
+  machine = { ... }:
+
+  {
+    imports = [
+      ./common/user-account.nix
+      ./common/x11.nix
+    ];
+
+    virtualisation.memorySize = 2047;
+    services.xserver.enable = true;
+    test-support.displayManager.auto.user = "alice";
+    environment.systemPackages = with pkgs; [
+      vscodium
+    ];
+  };
+
+  enableOCR = true;
+
+  testScript = { nodes, ... }: ''
+    # Start up X
+    start_all()
+    machine.wait_for_x()
+
+    # Create a file that we'll open
+    machine.succeed("su - alice -c 'echo \"   Hello World\" > foo.txt'")
+
+    # It's one line long
+    assert "1 foo.txt" in machine.succeed(
+        "su - alice -c 'wc foo.txt -l'"
+    ), "File has wrong length"
+
+    # Start VSCodium with that file
+    machine.succeed("su - alice -c 'codium foo.txt' &")
+
+    # Wait for the window to appear
+    machine.wait_for_text("VSCodium")
+
+    # Add a line
+    machine.send_key("ret")
+
+    # Save file
+    machine.send_key("ctrl-s")
+
+    # Wait until the file has been saved
+    machine.sleep(1)
+
+    # Now the file is 2 lines long
+    assert "2 foo.txt" in machine.succeed(
+        "su - alice -c 'wc foo.txt -l'"
+    ), "File has wrong length"
+
+    machine.screenshot("VSCodium")
+  '';
+})

pkgs/applications/editors/vscode/generic.nix

@@ -3,6 +3,9 @@
 , gtk2, atomEnv, at-spi2-atk, autoPatchelfHook
 , systemd, fontconfig, libdbusmenu
 
+# Populate passthru.tests
+, tests
+
 # Attributes inherit from specific versions
 , version, src, meta, sourceRoot
 , executableName, longName, shortName, pname
@@ -16,7 +19,7 @@ in
     inherit pname version src sourceRoot;
 
     passthru = {
-      inherit executableName;
+      inherit executableName tests;
     };
 
     desktopItem = makeDesktopItem {

pkgs/applications/editors/vscode/vscodium.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, callPackage, fetchurl }:
+{ lib, stdenv, callPackage, fetchurl, nixosTests }:
 
 let
   inherit (stdenv.hostPlatform) system;
@@ -45,6 +45,8 @@ in
       inherit sha256;
     };
 
+    tests = nixosTests.vscodium;
+
     meta = with lib; {
       description = ''
         Open source source code editor developed by Microsoft for Windows,