1 files changed, 34 insertions, 0 deletions
diff --git a/spec/ruby/language/predefined/toplevel_binding_spec.rb b/spec/ruby/language/predefined/toplevel_binding_spec.rb
new file mode 100644
index 0000000000..69ac28618c
--- /dev/null
+++ b/spec/ruby/language/predefined/toplevel_binding_spec.rb
@@ -0,0 +1,34 @@
+require_relative '../../spec_helper'
+
+describe "The TOPLEVEL_BINDING constant" do
+  it "only includes local variables defined in the main script, not in required files or eval" do
+    binding_toplevel_variables = ruby_exe(fixture(__FILE__, "toplevel_binding_variables.rb"))
+    binding_toplevel_variables.should == "[:required_after, [:main_script]]\n[:main_script]\n"
+  end
+
+  it "has no local variables in files required before the main script" do
+    required = fixture(__FILE__, 'toplevel_binding_required_before.rb')
+    out = ruby_exe("a=1; p TOPLEVEL_BINDING.local_variables.sort; b=2", options: "-r#{required}")
+    out.should == "[:required_before, []]\n[:a, :b]\n"
+  end
+
+  it "merges local variables of the main script with dynamically-defined Binding variables" do
+    required = fixture(__FILE__, 'toplevel_binding_dynamic_required.rb')
+    out = ruby_exe(fixture(__FILE__, 'toplevel_binding_dynamic.rb'), options: "-r#{required}")
+    out.should == <<EOS
+[:dynamic_set_required]
+[:dynamic_set_required, :main_script]
+[:dynamic_set_main, :dynamic_set_required, :main_script]
+EOS
+  end
+
+  it "gets updated variables values as they are defined and set" do
+    out = ruby_exe(fixture(__FILE__, "toplevel_binding_values.rb"))
+    out.should == "nil\nnil\n1\nnil\n3\n2\n"
+  end
+
+  it "is always the same object for all top levels" do
+    binding_toplevel_id = ruby_exe(fixture(__FILE__, "toplevel_binding_id.rb"))
+    binding_toplevel_id.should == "1\n"
+  end
+end