vscode: add userTasks test

tests/modules/programs/vscode/default.nix

@@ -1,4 +1,5 @@
 {
   vscode-keybindings = ./keybindings.nix;
+  vscode-tasks = ./tasks.nix;
   vscode-update-checks = ./update-checks.nix;
 }

tests/modules/programs/vscode/tasks.nix

@@ -0,0 +1,43 @@
+{ pkgs, config, ... }:
+
+let
+
+  tasksFilePath = if pkgs.stdenv.hostPlatform.isDarwin then
+    "Library/Application Support/Code/User/tasks.json"
+  else
+    ".config/Code/User/tasks.json";
+
+  tasks = {
+    version = "2.0.0";
+    tasks = [{
+      type = "shell";
+      label = "Hello task";
+      command = "hello";
+    }];
+  };
+
+  expectedTasks = pkgs.writeText "tasks-expected.json" ''
+    {
+      "tasks": [
+        {
+          "command": "hello",
+          "label": "Hello task",
+          "type": "shell"
+        }
+      ],
+      "version": "2.0.0"
+    }
+  '';
+
+in {
+  programs.vscode = {
+    enable = true;
+    package = pkgs.writeScriptBin "vscode" "" // { pname = "vscode"; };
+    userTasks = tasks;
+  };
+
+  nmt.script = ''
+    assertFileExists "home-files/${tasksFilePath}"
+    assertFileContent "home-files/${tasksFilePath}" "${expectedTasks}"
+  '';
+}