1 files changed, 44 insertions, 33 deletions
diff --git a/spec/ruby/core/fiber/blocking_spec.rb b/spec/ruby/core/fiber/blocking_spec.rb
index 5ae5fbd577..d5caf81fbe 100644
--- a/spec/ruby/core/fiber/blocking_spec.rb
+++ b/spec/ruby/core/fiber/blocking_spec.rb
@@ -1,62 +1,73 @@
 require_relative '../../spec_helper'
 require_relative 'shared/blocking'
 
-ruby_version_is "3.0" do
-  require "fiber"
+describe "Fiber.blocking?" do
+  it_behaves_like :non_blocking_fiber, -> { Fiber.blocking? }
 
-  describe "Fiber.blocking?" do
-    it_behaves_like :non_blocking_fiber, -> { Fiber.blocking? }
+  context "when fiber is blocking" do
+    context "root Fiber of the main thread" do
+      it "returns 1 for blocking: true" do
+        fiber = Fiber.new(blocking: true) { Fiber.blocking? }
+        blocking = fiber.resume
 
-    context "when fiber is blocking" do
-      context "root Fiber of the main thread" do
-        it "returns 1 for blocking: true" do
+        blocking.should == 1
+      end
+    end
+
+    context "root Fiber of a new thread" do
+      it "returns 1 for blocking: true" do
+        thread = Thread.new do
           fiber = Fiber.new(blocking: true) { Fiber.blocking? }
           blocking = fiber.resume
 
           blocking.should == 1
         end
+
+        thread.join
       end
+    end
+  end
+end
 
-      context "root Fiber of a new thread" do
-        it "returns 1 for blocking: true" do
-          thread = Thread.new do
-            fiber = Fiber.new(blocking: true) { Fiber.blocking? }
-            blocking = fiber.resume
+describe "Fiber#blocking?" do
+  it_behaves_like :non_blocking_fiber, -> { Fiber.current.blocking? }
 
-            blocking.should == 1
-          end
+  context "when fiber is blocking" do
+    context "root Fiber of the main thread" do
+      it "returns true for blocking: true" do
+        fiber = Fiber.new(blocking: true) { Fiber.current.blocking? }
+        blocking = fiber.resume
 
-          thread.join
-        end
+        blocking.should == true
       end
     end
-  end
 
-  describe "Fiber#blocking?" do
-    it_behaves_like :non_blocking_fiber, -> { Fiber.current.blocking? }
-
-    context "when fiber is blocking" do
-      context "root Fiber of the main thread" do
-        it "returns true for blocking: true" do
+    context "root Fiber of a new thread" do
+      it "returns true for blocking: true" do
+        thread = Thread.new do
           fiber = Fiber.new(blocking: true) { Fiber.current.blocking? }
           blocking = fiber.resume
 
           blocking.should == true
         end
-      end
 
-      context "root Fiber of a new thread" do
-        it "returns true for blocking: true" do
-          thread = Thread.new do
-            fiber = Fiber.new(blocking: true) { Fiber.current.blocking? }
-            blocking = fiber.resume
-
-            blocking.should == true
-          end
+        thread.join
+      end
+    end
+  end
+end
 
-          thread.join
+describe "Fiber.blocking" do
+  context "when fiber is non-blocking" do
+    it "can become blocking" do
+      fiber = Fiber.new(blocking: false) do
+        Fiber.blocking do |f|
+          f.blocking? ? :blocking : :non_blocking
         end
       end
+
+      blocking = fiber.resume
+      blocking.should == :blocking
     end
   end
 end