1 files changed, 39 insertions, 0 deletions
diff --git a/spec/ruby/core/warning/element_set_spec.rb b/spec/ruby/core/warning/element_set_spec.rb
new file mode 100644
index 0000000000..3c8ceb721e
--- /dev/null
+++ b/spec/ruby/core/warning/element_set_spec.rb
@@ -0,0 +1,39 @@
+require_relative '../../spec_helper'
+
+describe "Warning.[]=" do
+  it "emits and suppresses warnings for :deprecated" do
+    ruby_exe('Warning[:deprecated] = true; $; = ""', args: "2>&1").should =~ /is deprecated/
+    ruby_exe('Warning[:deprecated] = false; $; = ""', args: "2>&1").should == ""
+  end
+
+  describe ":experimental" do
+    before do
+      @src = 'warn "This is experimental warning.", category: :experimental'
+    end
+
+    it "emits and suppresses warnings for :experimental" do
+      ruby_exe("Warning[:experimental] = true; eval('#{@src}')", args: "2>&1").should =~ /is experimental/
+      ruby_exe("Warning[:experimental] = false; eval('#{@src}')", args: "2>&1").should == ""
+    end
+  end
+
+  it "enables or disables performance warnings" do
+    original = Warning[:performance]
+    begin
+      Warning[:performance] = !original
+      Warning[:performance].should == !original
+    ensure
+      Warning[:performance] = original
+    end
+  end
+
+  it "raises for unknown category" do
+    -> { Warning[:noop] = false }.should.raise(ArgumentError, /unknown category: noop/)
+  end
+
+  it "raises for non-Symbol category" do
+    -> { Warning[42] = false }.should.raise(TypeError)
+    -> { Warning[false] = false }.should.raise(TypeError)
+    -> { Warning["noop"] = false }.should.raise(TypeError)
+  end
+end