2 files changed, 22 insertions, 0 deletions
diff --git a/spec/ruby/library/irb/fixtures/irb.rb b/spec/ruby/library/irb/fixtures/irb.rb
new file mode 100644
index 0000000000..5f305f2d5d
--- /dev/null
+++ b/spec/ruby/library/irb/fixtures/irb.rb
@@ -0,0 +1,3 @@
+a = 10
+
+binding.irb
diff --git a/spec/ruby/library/irb/irb_spec.rb b/spec/ruby/library/irb/irb_spec.rb
new file mode 100644
index 0000000000..2607c7ef33
--- /dev/null
+++ b/spec/ruby/library/irb/irb_spec.rb
@@ -0,0 +1,19 @@
+require_relative '../../spec_helper'
+require 'tmpdir'
+
+describe "Binding#irb" do
+  it "creates an IRB session with the binding in scope" do
+    irb_fixture = fixture __FILE__, "irb.rb"
+    envs = %w[IRBRC HOME XDG_CONFIG_HOME].to_h {|e| [e, nil]}
+
+    out = Dir.mktmpdir do |dir|
+      IO.popen([envs, *ruby_exe, irb_fixture, chdir: dir], "r+") do |pipe|
+        pipe.puts "a ** 2"
+        pipe.puts "exit"
+        pipe.readlines.map(&:chomp).reject(&:empty?)
+      end
+    end
+
+    out.last(3).should == ["a ** 2", "100", "exit"]
+  end
+end