diff --git a/test/options.test.js b/test/options.test.js
index cd73993..027a9ae 100644
--- a/test/options.test.js
+++ b/test/options.test.js
@@ -35,3 +35,32 @@ test("rejects unknown cache types and unsafe depth values", () => {
   assert.throws(() => parseOptions(["--type", "unknown"]), /Unknown cache type/);
   assert.throws(() => parseOptions(["--max-depth", "0"]), /between 1 and 100/);
 });
+
+test("parses help and version flags without changing the default root", () => {
+  const helpOptions = parseOptions(["--help"], "/workspace");
+  const versionOptions = parseOptions(["--version"], "/workspace");
+
+  assert.equal(helpOptions.root, path.resolve("/workspace"));
+  assert.equal(helpOptions.help, true);
+  assert.equal(helpOptions.version, false);
+  assert.equal(versionOptions.root, path.resolve("/workspace"));
+  assert.equal(versionOptions.help, false);
+  assert.equal(versionOptions.version, true);
+});
+
+test("rejects options with missing values", () => {
+  assert.throws(() => parseOptions(["--format"]), /--format requires a value/);
+  assert.throws(
+    () => parseOptions(["--min-size", "--apply"]),
+    /--min-size requires a value/,
+  );
+});
+
+test("rejects invalid output formats and extra positional arguments", () => {
+  assert.throws(() => parseOptions(["--format", "xml"]), /Unsupported format/);
+  assert.throws(() => parseOptions(["--verbose"]), /Unknown option: --verbose/);
+  assert.throws(
+    () => parseOptions(["workspace", "other"]),
+    /Unexpected argument: other/,
+  );
+});