Merge pull request #724 from hypothesis/fix-commander-error

Set allowExcessArguments in commander used in runTests

Author: acelaya

lib/tests.js

@@ -32,6 +32,7 @@ export async function runTests({
 }) {
   // Parse command-line options for test execution.
   program
+    .allowExcessArguments()
     .option(
       '--grep <pattern>',
       'Run only tests where filename matches a regex pattern',