1 files changed, 30 insertions, 22 deletions
diff --git a/spec/ruby/core/warning/element_set_spec.rb b/spec/ruby/core/warning/element_set_spec.rb
index b21436d3c7..3c8ceb721e 100644
--- a/spec/ruby/core/warning/element_set_spec.rb
+++ b/spec/ruby/core/warning/element_set_spec.rb
@@ -1,31 +1,39 @@
 require_relative '../../spec_helper'
 
-ruby_version_is '2.7' do
-  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
-        ruby_version_is ""..."3.0" do
-          @src = 'case [0, 1]; in [a, b]; end'
-        end
+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
 
-        ruby_version_is "3.0" do
-          @src = '[0, 1] => [a, b]'
-        end
-      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
+    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 "raises for unknown category" do
-      -> { Warning[:noop] = false }.should raise_error(ArgumentError, /unknown category: noop/)
+  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