Remove warning from Ractor spec

Ractors are experimental, thus Ruby warns when using them. We don't
need to be reminded every time we run the tests though, so let's
silence the experimental warning when running those tests.

Also remove the check for Ruby version since all versions we support
now have Ractors.

Author: jbourassa

spec/integration/ractor_spec.rb

@@ -1,50 +1,48 @@
-if RUBY_VERSION.start_with?("3.")
-  RSpec.describe "Ractor" do
-    let(:wat) { <<~WAT }
-      (module
-        (func $module/hello (result i32 i64 f32 f64)
-          i32.const 1
-          i64.const 2
-          f32.const 3.0
-          f64.const 4.0
-        )
-
-        (export "hello" (func $module/hello))
+RSpec.describe "Ractor", ractor: true do
+  let(:wat) { <<~WAT }
+    (module
+      (func $module/hello (result i32 i64 f32 f64)
+        i32.const 1
+        i64.const 2
+        f32.const 3.0
+        f64.const 4.0
       )
-    WAT
-
-    it "supports running inside Ractors" do
-      r = Ractor.new(wat) do |wat|
-        engine = Wasmtime::Engine.new
-        mod = Wasmtime::Module.new(engine, wat)
-        store_data = Object.new
-        store = Wasmtime::Store.new(engine, store_data)
-        Wasmtime::Instance.new(store, mod).invoke("hello")
-      end
 
-      result = r.take
-      expect(result).to eq([1, 2, 3.0, 4.0])
-    end
+      (export "hello" (func $module/hello))
+    )
+  WAT
 
-    it "supports sharing Engine & Module with Ractors" do
+  it "supports running inside Ractors" do
+    r = Ractor.new(wat) do |wat|
       engine = Wasmtime::Engine.new
       mod = Wasmtime::Module.new(engine, wat)
+      store_data = Object.new
+      store = Wasmtime::Store.new(engine, store_data)
+      Wasmtime::Instance.new(store, mod).invoke("hello")
+    end
 
-      Ractor.make_shareable(engine)
-      Ractor.make_shareable(mod)
+    result = r.take
+    expect(result).to eq([1, 2, 3.0, 4.0])
+  end
 
-      ractors = []
-      3.times do
-        ractors << Ractor.new(engine, mod) do |engine, mod|
-          store_data = Object.new
-          store = Wasmtime::Store.new(engine, store_data)
-          Wasmtime::Instance.new(store, mod).invoke("hello")
-        end
-      end
+  it "supports sharing Engine & Module with Ractors" do
+    engine = Wasmtime::Engine.new
+    mod = Wasmtime::Module.new(engine, wat)
 
-      ractors.each do |ractor|
-        expect(ractor.take).to eq([1, 2, 3.0, 4.0])
+    Ractor.make_shareable(engine)
+    Ractor.make_shareable(mod)
+
+    ractors = []
+    3.times do
+      ractors << Ractor.new(engine, mod) do |engine, mod|
+        store_data = Object.new
+        store = Wasmtime::Store.new(engine, store_data)
+        Wasmtime::Instance.new(store, mod).invoke("hello")
       end
     end
+
+    ractors.each do |ractor|
+      expect(ractor.take).to eq([1, 2, 3.0, 4.0])
+    end
   end
 end

spec/spec_helper.rb

@@ -91,6 +91,14 @@ def with_gc_stress
       with_gc_stress { ex.run }
     end
   end
+
+  config.around(:each, :ractor) do |example|
+    was = Warning[:experimental]
+    Warning[:experimental] = false
+    example.run
+  ensure
+    Warning[:experimental] = was
+  end
 end
 
 at_exit { GC.start(full_mark: true) } if ENV["GC_AT_EXIT"] == "1"