Setup vscode-test and deprecate Mocha

Author: andyleejordan

.mocharc.json

@@ -0,0 +1,20 @@
+import { defineConfig } from "@vscode/test-cli";
+import os from "os";
+import path from "path";
+
+export default defineConfig({
+    files: "test/**/*.test.ts",
+    // The default user data directory had too many characters for the IPC connection on macOS in CI.
+    launchArgs: [
+        "--profile-temp",
+        "--user-data-dir",
+        path.join(os.tmpdir(), "vscode-user-data"),
+    ],
+    workspaceFolder: "test/TestEnvironment.code-workspace",
+    mocha: {
+        ui: "bdd", // describe, it, etc.
+        require: ["esbuild-register"], // transpile TypeScript on-the-fly
+        slow: 2000, // 2 seconds for slow test
+        timeout: 60 * 1000, // 10 minutes to allow for debugging
+    },
+});