test: dedupe and optimize test suites

src/test-utils/command-runner.ts

@@ -0,0 +1,10 @@
+import { Command } from "commander";
+
+export async function runRegisteredCli(params: {
+  register: (program: Command) => void;
+  argv: string[];
+}): Promise<void> {
+  const program = new Command();
+  params.register(program);
+  await program.parseAsync(params.argv, { from: "user" });
+}