From 33aaa2aa15980f8ac0f330fc817f179e46daed55 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 16 Apr 2020 18:47:04 +0900
Subject: [PATCH] Added test for invalid env exec option

---
 test/ruby/test_process.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/ruby/test_process.rb b/test/ruby/test_process.rb
index a5eb0a5844..e9c7ee62b2 100644
--- a/test/ruby/test_process.rb
+++ b/test/ruby/test_process.rb
@@ -338,6 +338,10 @@ class TestProcess < Test::Unit::TestCase
     ensure
       ENV["hmm"] = old
     end
+
+    assert_raise_with_message(ArgumentError, /fo=fo/) {
+      system({"fo=fo"=>"ha"}, *ENVCOMMAND)
+    }
   end
 
   def test_execopt_env_path