CLI docs (#121)

* Start of cli docs

* Document the CLI

Also adds support for the `--config` option and `--port` option for the dev server.

* Add tests for --config and --port flags

* Add port to validateConfig

1 files changed, 9 insertions, 0 deletions

diff --git a/test/helpers.js b/test/helpers.js
index 8ca42ea11..eb7cabb0b 100644
--- a/test/helpers.js
+++ b/test/helpers.js
@@ -4,6 +4,8 @@ import { readFile } from 'fs/promises';
 import { createRuntime } from '../lib/runtime.js';
 import { loadConfig } from '../lib/config.js';
 import * as assert from 'uvu/assert';
+import execa from 'execa';
+
 /** setup fixtures for tests */
 export function setup(Suite, fixturePath) {
   let runtime, setupError;
@@ -62,3 +64,10 @@ export function setupBuild(Suite, fixturePath) {
     assert.equal(setupError, undefined);
   });
 }
+
+const cliURL = new URL('../astro.mjs', import.meta.url);
+export function runDevServer(root, additionalArgs = []) {
+  const args = [cliURL.pathname, 'dev', '--project-root', root.pathname].concat(additionalArgs);
+  const proc = execa('node', args);
+  return proc;
+}
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