test(cli): add command path coverage

tests/cli/cli-commands.test.ts

@@ -0,0 +1,74 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { spawnSync } from 'node:child_process';
+import { readFileSync } from 'node:fs';
+import * as path from 'node:path';
+
+const CLI_PATH = path.resolve(__dirname, '..', '..', '..', 'bin', 'opk');
+const PACKAGE_JSON_PATH = path.resolve(__dirname, '..', '..', '..', 'package.json');
+
+interface CliResult {
+  stdout: string;
+  stderr: string;
+  status: number | null;
+}
+
+interface PackageJson {
+  version: string;
+}
+
+function runCli(args: string[]): CliResult {
+  const result = spawnSync(process.execPath, [CLI_PATH, ...args], {
+    encoding: 'utf8',
+  });
+
+  return {
+    stdout: result.stdout,
+    stderr: result.stderr,
+    status: result.status,
+  };
+}
+
+function getPackageVersion(): string {
+  const packageJson = JSON.parse(readFileSync(PACKAGE_JSON_PATH, 'utf8')) as PackageJson;
+  return packageJson.version;
+}
+
+test('CLI commands', async (t) => {
+  await t.test('should print help and exit with 0 when no command is provided', () => {
+    const result = runCli([]);
+
+    assert.strictEqual(result.status, 0);
+    assert.match(result.stdout, /OpenPolicyKit v\d+\.\d+\.\d+/);
+    assert.match(result.stdout, /Usage:/);
+    assert.match(result.stdout, /opk scan \[path\]/);
+    assert.strictEqual(result.stderr, '');
+  });
+
+  await t.test('should print scan help and exit with 0', () => {
+    const result = runCli(['scan', '--help']);
+
+    assert.strictEqual(result.status, 0);
+    assert.match(result.stdout, /Scan options:/);
+    assert.match(result.stdout, /--json/);
+    assert.match(result.stdout, /--min-severity <level>/);
+    assert.strictEqual(result.stderr, '');
+  });
+
+  await t.test('should print the package version and exit with 0', () => {
+    const result = runCli(['--version']);
+
+    assert.strictEqual(result.status, 0);
+    assert.strictEqual(result.stdout.trim(), getPackageVersion());
+    assert.strictEqual(result.stderr, '');
+  });
+
+  await t.test('should exit with 2 for an unknown command', () => {
+    const result = runCli(['unknown']);
+
+    assert.strictEqual(result.status, 2);
+    assert.strictEqual(result.stdout, '');
+    assert.match(result.stderr, /Unknown command: unknown/);
+    assert.match(result.stderr, /Run "opk --help" for usage information\./);
+  });
+});