1 files changed, 20 insertions, 0 deletions
diff --git a/spec/ruby/core/env/clear_spec.rb b/spec/ruby/core/env/clear_spec.rb
new file mode 100644
index 0000000000..c0d20193ad
--- /dev/null
+++ b/spec/ruby/core/env/clear_spec.rb
@@ -0,0 +1,20 @@
+require_relative '../../spec_helper'
+
+describe "ENV.clear" do
+  it "deletes all environment variables" do
+    orig = ENV.to_hash
+    begin
+      ENV.clear.should.equal?(ENV)
+
+      # This used 'env' the helper before. That shells out to 'env' which
+      # itself sets up certain environment variables before it runs, because
+      # the shell sets them up before it runs any command.
+      #
+      # Thusly, you can ONLY test this by asking through ENV itself.
+      ENV.size.should == 0
+    ensure
+      ENV.replace orig
+    end
+  end
+
+end