Make _required_arguments required

test/test-arguments

@@ -38,4 +38,23 @@ testArgumentsNotDeclaredDoNot() {
   assertEquals "" "$STDOUT"
 }
 
+testRequiredArgumentsAreRequired() {
+  echo '
+  #!/usr/bin/env bash
+
+  ⚡banana() {
+    _required_argument hello
+    echo "$_arg_hello"
+  }
+  ' > go
+
+  echo "source $REPO_ROOT/⚡" >> go
+  chmod +x go
+
+  try ./go banana
+  assertContains "$STDERR" "'hello' is a required argument"
+  assertEquals 1 "$EXIT_CODE"
+}
+
+
 source $(dirname $0)/runner

⚡

@@ -66,7 +66,10 @@ _argument() {
 
 _required_argument() {
   _argument "$@"
-
+  if [[ ! -v "_arg_$1" ]]; then
+    _bad-message "'hello' is a required argument" >&2
+    exit 1
+  fi
 }
 
 _good-message() {