3 files changed, 13 insertions, 2 deletions
diff --git a/spec/ruby/core/warning/element_reference_spec.rb b/spec/ruby/core/warning/element_reference_spec.rb
index a346cf535b..f51cc87de5 100644
--- a/spec/ruby/core/warning/element_reference_spec.rb
+++ b/spec/ruby/core/warning/element_reference_spec.rb
@@ -12,5 +12,11 @@ ruby_version_is '2.7' do
     it "raises for unknown category" do
       -> { Warning[:noop] }.should raise_error(ArgumentError, /unknown category: noop/)
     end
+
+    it "raises for non-Symbol category" do
+      -> { Warning[42] }.should raise_error(TypeError)
+      -> { Warning[false] }.should raise_error(TypeError)
+      -> { Warning["noop"] }.should raise_error(TypeError)
+    end
   end
 end
diff --git a/spec/ruby/core/warning/element_set_spec.rb b/spec/ruby/core/warning/element_set_spec.rb
index 3b0ea45c9b..611060fb3a 100644
--- a/spec/ruby/core/warning/element_set_spec.rb
+++ b/spec/ruby/core/warning/element_set_spec.rb
@@ -27,5 +27,11 @@ ruby_version_is '2.7' do
     it "raises for unknown category" do
       -> { Warning[:noop] = false }.should raise_error(ArgumentError, /unknown category: noop/)
     end
+
+    it "raises for non-Symbol category" do
+      -> { Warning[42] = false }.should raise_error(TypeError)
+      -> { Warning[false] = false }.should raise_error(TypeError)
+      -> { Warning["noop"] = false }.should raise_error(TypeError)
+    end
   end
 end
diff --git a/spec/ruby/core/warning/warn_spec.rb b/spec/ruby/core/warning/warn_spec.rb
index 2ded6a109d..5ccff3aa2b 100644
--- a/spec/ruby/core/warning/warn_spec.rb
+++ b/spec/ruby/core/warning/warn_spec.rb
@@ -51,7 +51,6 @@ describe "Warning.warn" do
     end
   end
 
-
   ruby_version_is '3.0' do
     it "is called by Kernel.warn with nil category keyword" do
       Warning.should_receive(:warn).with("Chunky bacon!\n", category: nil)
@@ -69,7 +68,7 @@ describe "Warning.warn" do
       verbose = $VERBOSE
       $VERBOSE = false
       begin
-        Kernel.warn("Chunky bacon!", category: 'deprecated')
+        Kernel.warn("Chunky bacon!", category: "deprecated")
       ensure
         $VERBOSE = verbose
       end